{"id":9385,"date":"2026-10-25T05:54:34","date_gmt":"2026-10-25T05:54:34","guid":{"rendered":"https:\/\/hysfsubsea.com\/?post_type=product&p=9385"},"modified":"2026-10-25T06:04:26","modified_gmt":"2026-10-25T06:04:26","slug":"bh25f-25-pin-female-bulkhead-subconn-compatible-underwater-connector","status":"publish","type":"product","link":"https:\/\/hysfsubsea.com\/ja\/product\/bh25f-25-pin-female-bulkhead-subconn-compatible-underwater-connector\/","title":{"rendered":"BH25F 25-Pin Female Bulkhead Underwater Connector \u2013 SubConn Compatible | HYSF SUBSEA"},"content":{"rendered":"

BH25F 25-Pin Female Bulkhead Underwater Connector \u2013 SubConn Compatible Standard Circular Series<\/h1>\n

Product Overview<\/h2>\n

The HYSF SUBSEA BH25F 25-Pin Female Bulkhead Underwater Connector<\/strong> is a high-density, pressure-resistant subsea electrical connector designed to provide reliable multi-channel power, signal, and control connections through underwater equipment housings.<\/p>\n

As part of the HYSF Standard Circular Connector Series, the BH25F features twenty-five gold-plated female electrical contacts<\/strong>, a corrosion-resistant 316L stainless steel housing<\/strong>, and a threaded bulkhead mounting arrangement for demanding marine applications.<\/p>\n

The BH25F provides a fixed electrical interface between internal equipment electronics and external subsea cable assemblies. Its twenty-five-contact configuration is particularly useful for systems requiring multiple electrical circuits through a single underwater pressure housing penetration.<\/p>\n

The Standard Circular series is designed for underwater applications at depths of up to 6,000 meters (60 MPa)<\/strong>, subject to qualification of the complete connector installation.<\/p>\n

The BH25F belongs to the 25-pin Standard Circular configuration, which has a nominal current rating of 5A per contact<\/strong> and a series rated voltage of 550V AC\/DC<\/strong>.<\/p>\n

Selected higher-current contact configurations may support up to 10A, depending on the approved connector design. These higher ratings should not automatically be assigned to every contact.<\/p>\n

The standard BH25F configuration features a 3\/4-16 UNF-2A mounting thread<\/strong>, a nominal 25 mm thread length<\/strong>, and approximately 0.3 meters of internal wire leads<\/strong> for electrical integration inside underwater equipment.<\/p>\n

The BH25F is primarily designed to mate with the IL25M 25-Pin Male Inline Underwater Connector<\/strong>.<\/p>\n

Its Standard Circular mating interface is designed for compatibility with corresponding SubConn and SEACON underwater electrical connector configurations.<\/p>\n

Typical applications include remotely operated vehicles (ROVs), autonomous underwater vehicles (AUVs), sonar systems, hydrophone arrays, oceanographic instruments, offshore monitoring equipment, subsea electronic modules, and marine research platforms.<\/p>\n

Key Features and Benefits<\/h2>\n

1. High-Density 25-Pin Female Electrical Interface<\/h3>\n

The BH25F incorporates twenty-five female electrical contact positions within a single circular bulkhead connector.<\/p>\n

This high-density arrangement provides an efficient solution for subsea equipment requiring multiple electrical circuits through one enclosure penetration.<\/p>\n

The contacts can be allocated to appropriately designed applications involving:<\/p>\n

    \n
  • Underwater sensor connections<\/li>\n
  • Marine instrumentation signals<\/li>\n
  • Electrical control circuits<\/li>\n
  • Low-power distribution<\/li>\n
  • Acoustic measurement channels<\/li>\n
  • Oceanographic monitoring equipment<\/li>\n
  • Auxiliary electrical functions<\/li>\n
  • Multi-channel data acquisition<\/li>\n
  • Underwater electronic control systems<\/li>\n<\/ul>\n

    Compared with several lower-pin-count bulkhead connectors, a single 25-pin female underwater connector may reduce the number of separate penetrations required in a pressure housing.<\/p>\n

    This can simplify equipment integration, cable routing, and enclosure design.<\/p>\n

    The actual contact functions should be selected according to the approved electrical schematic and wiring arrangement.<\/p>\n

    2. Nominal 5A per Contact Current Rating<\/h3>\n

    The BH25F belongs to the HYSF Standard Circular 12\/16\/25 Pin connector family.<\/p>\n

    The standard 25-pin configuration has a nominal current rating of 5A per contact<\/strong>.<\/p>\n

    This differs from the Standard Circular 12-pin and 16-pin configurations, which have a catalog current rating of 10A per contact.<\/p>\n

    The manufacturer’s series documentation also references selected higher-current configurations reaching 10A.<\/p>\n

    However, the specific contact arrangement and permitted operating conditions must be verified before applying a higher current rating.<\/p>\n

    The electrical loading capability of a complete assembly depends on:<\/p>\n

      \n
    • Individual contact specifications<\/li>\n
    • Internal wire cross-sectional area<\/li>\n
    • Number of simultaneously loaded contacts<\/li>\n
    • Operating temperature<\/li>\n
    • Conductor insulation<\/li>\n
    • Termination quality<\/li>\n
    • Heat dissipation<\/li>\n
    • Connected equipment requirements<\/li>\n<\/ul>\n

      For systems requiring continuous operation near the maximum contact current, the complete electrical assembly should be evaluated for thermal performance and voltage drop.<\/p>\n

      3. Rated Voltage of 550V AC\/DC<\/h3>\n

      The HYSF Standard Circular connector series has a rated voltage of 550V AC\/DC<\/strong>.<\/p>\n

      The BH25F can be used in appropriately designed subsea electrical systems operating within the approved voltage rating.<\/p>\n

      When multiple electrical circuits share one connector, engineers should consider insulation requirements, voltage differences between contacts, grounding, and circuit separation.<\/p>\n

      The allowable system voltage must not exceed the rating of the lowest-rated component in the complete electrical assembly.<\/p>\n

      4. SubConn and SEACON Compatible Standard Circular Design<\/h3>\n

      The HYSF BH25F is designed for mating compatibility with corresponding SubConn and SEACON Standard Circular 25-pin underwater connector interfaces<\/strong>.<\/p>\n

      This makes the BH25F suitable for consideration in new underwater equipment designs and compatible replacement applications.<\/p>\n

      Typical projects include:<\/p>\n

        \n
      • Replacement underwater bulkhead connectors<\/li>\n
      • ROV electrical system upgrades<\/li>\n
      • Offshore instrument maintenance<\/li>\n
      • Marine scientific equipment<\/li>\n
      • OEM subsea electronics<\/li>\n
      • Customized underwater cable assemblies<\/li>\n
      • Compatible subsea connector replacement<\/li>\n<\/ul>\n

        The primary HYSF mating connector is IL25M<\/strong>, a 25-pin male inline underwater cable connector.<\/p>\n

        Before mating the BH25F with another manufacturer’s connector, verify the exact series, contact configuration, mating dimensions, and locking arrangement.<\/p>\n

        Compatibility should be confirmed using the applicable product drawings.<\/p>\n

        5. Designed for Deep-Sea Applications up to 6,000 Meters<\/h3>\n

        The HYSF Standard Circular connector family is designed for demanding underwater environments involving high hydrostatic pressure.<\/p>\n

        The series supports a design depth capability of up to 6,000 meters<\/strong>, corresponding to approximately 60 MPa<\/strong>.<\/p>\n

        The BH25F can therefore be considered for suitable applications involving:<\/p>\n

          \n
        • Deep-sea exploration<\/li>\n
        • Oceanographic research<\/li>\n
        • Seabed monitoring<\/li>\n
        • Offshore underwater inspection<\/li>\n
        • Subsea robotic systems<\/li>\n
        • Deep-water scientific instruments<\/li>\n
        • Marine environmental monitoring<\/li>\n<\/ul>\n

          The bulkhead connector provides an electrical connection through a pressure housing wall while helping maintain enclosure sealing integrity.<\/p>\n

          Actual operating depth depends on the complete installed assembly, including the connector housing, O-ring seal, equipment enclosure, internal wiring, external mating connector, and required environmental qualification.<\/p>\n

          For critical subsea applications, the complete installation should be tested and verified for the intended working pressure.<\/p>\n

          6. Corrosion-Resistant 316L Stainless Steel Housing<\/h3>\n

          The standard BH25F features a 316L stainless steel bulkhead housing<\/strong>.<\/p>\n

          316L stainless steel is widely used in marine equipment because of its mechanical strength, corrosion resistance, and durability.<\/p>\n

          Its principal benefits include:<\/p>\n

            \n
          • Good corrosion resistance in marine environments<\/li>\n
          • High mechanical strength<\/li>\n
          • Durable threaded mounting<\/li>\n
          • Dimensional stability<\/li>\n
          • Suitability for pressure housing installations<\/li>\n
          • Resistance to routine handling and mechanical wear<\/li>\n<\/ul>\n

            The metal housing provides structural support for the electrical contact assembly and bulkhead mounting arrangement.<\/p>\n

            Alternative housing materials may be considered for customized applications.<\/p>\n

            When stainless steel connectors are installed in aluminum pressure housings, potential galvanic corrosion should be evaluated.<\/p>\n

            Suitable protective coatings, material selection, and isolation measures may be required.<\/p>\n

            7. Precision 3\/4-16 UNF-2A Bulkhead Mounting Thread<\/h3>\n

            The BH25F features a threaded mounting arrangement designed for installation through subsea equipment enclosures.<\/p>\n

            The corresponding Standard Circular 12\/16\/25 Pin technical documentation specifies:<\/p>\n

              \n
            • Mounting Thread:<\/strong> 3\/4-16 UNF-2A<\/li>\n
            • Nominal Thread Length:<\/strong> 25 mm<\/li>\n
            • Base Mounting Radius:<\/strong> 32.4 mm<\/li>\n
            • Mounting Surface Roughness:<\/strong> Ra 1.6<\/li>\n
            • Mounting Configuration:<\/strong> Threaded Bulkhead<\/li>\n<\/ul>\n

              The threaded design allows the BH25F to be secured to a compatible pressure housing or underwater equipment panel.<\/p>\n

              The standard mounting arrangement includes the specified locking nut. POM is the standard nut material, while 316L stainless steel is available as an alternative.<\/p>\n

              Before machining the enclosure, the installation hole dimensions, sealing geometry, panel thickness, and installation clearances should be verified against the approved BH25F mechanical drawing.<\/p>\n

              The mounting thread alone does not define the complete installation requirements.<\/p>\n

              8. Watertight O-Ring Sealing System<\/h3>\n

              The BH25F incorporates an O-ring sealing arrangement designed to help prevent seawater ingress through the mounting interface.<\/p>\n

              The seal provides a protective barrier between the connector housing and the equipment enclosure wall.<\/p>\n

              Effective sealing depends on:<\/p>\n

                \n
              • Correct O-ring dimensions<\/li>\n
              • Suitable elastomer material<\/li>\n
              • Accurate mounting geometry<\/li>\n
              • Proper sealing surface finish<\/li>\n
              • Appropriate O-ring compression<\/li>\n
              • Correct installation procedure<\/li>\n
              • Suitable enclosure material<\/li>\n
              • Mechanical loading conditions<\/li>\n<\/ul>\n

                The sealing components should be inspected before installation.<\/p>\n

                For equipment operating under high hydrostatic pressure, the complete connector and enclosure assembly should be included in the pressure qualification process.<\/p>\n

                9. Standard 0.3-Meter Internal Wire Leads<\/h3>\n

                The standard BH25F is normally supplied with approximately 0.3 meters of internal wire leads<\/strong>.<\/p>\n

                These leads extend from the rear of the bulkhead connector into the underwater equipment housing.<\/p>\n

                They provide electrical integration with components such as:<\/p>\n

                  \n
                • Electronic control boards<\/li>\n
                • Sensor electronics<\/li>\n
                • Power distribution terminals<\/li>\n
                • Marine instrumentation<\/li>\n
                • Internal wiring harnesses<\/li>\n
                • Data acquisition equipment<\/li>\n
                • Subsea monitoring modules<\/li>\n<\/ul>\n

                  Customized internal wire lengths and termination configurations can be specified according to equipment requirements.<\/p>\n

                  The actual conductor identification and pin assignments must be confirmed using the approved production drawing.<\/p>\n

                  10. Gold-Plated Female Electrical Contacts<\/h3>\n

                  The BH25F incorporates gold-plated female electrical contacts.<\/p>\n

                  Gold plating provides a conductive contact surface and helps reduce oxidation.<\/p>\n

                  Stable electrical contact performance is particularly important for subsea instrumentation and monitoring equipment requiring reliable electrical continuity.<\/p>\n

                  The female contact interface is designed to mate with the corresponding IL25M male connector.<\/p>\n

                  Before connection, the mating interface should be inspected for sand, sediment, salt deposits, contamination, and visible mechanical damage.<\/p>\n

                  Correct handling and routine maintenance help maintain connector reliability.<\/p>\n

                  11. Wet-Mateable Underwater Connector Design<\/h3>\n

                  The BH25F belongs to HYSF SUBSEA’s wet-mateable Standard Circular connector family.<\/p>\n

                  Its mating interface is designed to support underwater connection and disconnection under the applicable procedures.<\/p>\n

                  Wet-mateable connector technology can be useful for:<\/p>\n

                    \n
                  • Modular underwater instrumentation<\/li>\n
                  • Removable subsea sensors<\/li>\n
                  • ROV maintenance operations<\/li>\n
                  • Underwater cable replacement<\/li>\n
                  • Marine scientific equipment servicing<\/li>\n
                  • Subsea equipment reconfiguration<\/li>\n<\/ul>\n

                    Important:<\/strong> Wet-mateable does not automatically mean live-mateable.<\/p>\n

                    Electrical power should be isolated before mating or unmating unless the specific connector assembly has been qualified for energized operation.<\/p>\n

                    BH25F Technical Specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                    \u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\n\u4ed5\u69d8<\/th>\n<\/tr>\n
                    Brand<\/td>\nHYSF SUBSEA<\/td>\n<\/tr>\n
                    Model Number<\/td>\nBH25F<\/td>\n<\/tr>\n
                    \u88fd\u54c1\u30b7\u30ea\u30fc\u30ba<\/td>\nStandard Circular<\/td>\n<\/tr>\n
                    \u30b3\u30cd\u30af\u30bf\u30fc\u30fb\u30bf\u30a4\u30d7<\/td>\nFemale Bulkhead Underwater Connector<\/td>\n<\/tr>\n
                    \u30b3\u30f3\u30bf\u30af\u30c8\u6570<\/td>\n25<\/td>\n<\/tr>\n
                    Contact Gender<\/td>\nFemale<\/td>\n<\/tr>\n
                    Contact Finish<\/td>\nGold-Plated<\/td>\n<\/tr>\n
                    Standard Housing Material<\/td>\n316L\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc<\/td>\n<\/tr>\n
                    Alternative Housing Materials<\/td>\nSubject to Engineering Configuration<\/td>\n<\/tr>\n
                    Rated Voltage<\/td>\n550V AC\/DC<\/td>\n<\/tr>\n
                    Nominal Rated Current<\/td>\n5A per Contact<\/td>\n<\/tr>\n
                    Selected Higher-Current Configurations<\/td>\nUp to 10A, Subject to Confirmation<\/td>\n<\/tr>\n
                    Design Depth Capability<\/td>\nUp to 6,000 Meters<\/td>\n<\/tr>\n
                    Pressure Capability<\/td>\nUp to 60 MPa<\/td>\n<\/tr>\n
                    Mating Type<\/td>\nWet-Mateable<\/td>\n<\/tr>\n
                    Mounting Type<\/td>\nThreaded Bulkhead<\/td>\n<\/tr>\n
                    \u53d6\u4ed8\u30cd\u30b8<\/td>\n3\/4-16 UNF-2A<\/td>\n<\/tr>\n
                    Nominal Thread Length<\/td>\n25 mm<\/td>\n<\/tr>\n
                    Base Mounting Radius<\/td>\n32.4 mm<\/td>\n<\/tr>\n
                    Mounting Surface Roughness<\/td>\nRa 1.6<\/td>\n<\/tr>\n
                    Standard Internal Wire Length<\/td>\n0.3 Meter<\/td>\n<\/tr>\n
                    Sealing System<\/td>\nO-Ring Sealing<\/td>\n<\/tr>\n
                    Primary Mating Connector<\/td>\nIL25M<\/td>\n<\/tr>\n
                    Protective Dummy Plug<\/td>\nDC25M<\/td>\n<\/tr>\n
                    Compatibility<\/td>\nCorresponding SubConn and SEACON Standard Circular Interfaces<\/td>\n<\/tr>\n
                    Warranty<\/td>\n12 Months<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                    Engineering Note:<\/strong> The nominal current rating is 5A per contact. Any higher-current configuration requires verification of the exact contact arrangement, internal wiring, and complete electrical assembly.<\/p>\n

                    25-Pin Wiring and Conductor Identification<\/h2>\n

                    The BH25F provides twenty-five electrical contact positions for multiple power, control, and signal circuits.<\/p>\n

                    Depending on the ordered configuration, its internal wire leads may use individual conductor colors, numbered identification sleeves, or customized markings.<\/p>\n

                    The HYSF Standard Circular 25-pin inline cable family includes wiring configurations with individual conductors and twisted-pair arrangements.<\/p>\n

                    However, the inline cable color sequence should not automatically be applied to BH25F bulkhead internal leads.<\/p>\n

                    The actual BH25F wiring arrangement depends on the approved production configuration.<\/p>\n

                    Recommended Wiring Verification<\/h3>\n

                    Before connecting the BH25F to internal equipment:<\/p>\n

                      \n
                    1. Confirm the connector contact numbering using the correct mating-face orientation.<\/li>\n
                    2. Identify every internal conductor.<\/li>\n
                    3. Review the approved pin-to-wire wiring diagram.<\/li>\n
                    4. Verify electrical continuity for each contact.<\/li>\n
                    5. Confirm all power, ground, control, and signal assignments.<\/li>\n
                    6. Document customized wiring arrangements for maintenance purposes.<\/li>\n<\/ol>\n

                      The actual conductor color mapping must be verified using the wiring documentation supplied with the completed connector.<\/p>\n

                      Compatible Connectors and Accessories<\/h2>\n

                      IL25M \u2013 25-Pin Male Inline Underwater Connector<\/h3>\n

                      The IL25M<\/strong> is the primary male inline connector designed to mate with the BH25F female bulkhead.<\/p>\n

                      It features twenty-five male electrical contacts and an integrated underwater cable.<\/p>\n

                      The standard IL25M is normally supplied with approximately one meter of cable.<\/p>\n

                      Normal electrical connection:<\/strong><\/p>\n

                      BH25F Female Bulkhead + IL25M Male Inline Connector<\/p>\n

                      This combination creates a detachable electrical connection between internal underwater equipment electronics and the external subsea cable assembly.<\/p>\n

                      DC25M \u2013 25-Pin Male Dummy Plug<\/h3>\n

                      The DC25M<\/strong> is the corresponding male protective dummy plug for the BH25F female bulkhead.<\/p>\n

                      When the operational IL25M cable connector is disconnected, the DC25M can be installed to help protect the exposed female mating interface.<\/p>\n

                      Protective configuration:<\/strong><\/p>\n

                      BH25F Female Bulkhead + DC25M Male Dummy Plug<\/p>\n

                      The DC25M is a non-electrical protective accessory and does not transmit power, data, or signals.<\/p>\n

                      Its environmental and pressure suitability should be verified for the complete capped connector assembly.<\/p>\n

                      BH25M \u2013 25-Pin Male Bulkhead Connector<\/h3>\n

                      The BH25M<\/strong> is the corresponding opposite-gender bulkhead connector in the Standard Circular 25-pin family.<\/p>\n

                      Its primary mating cable connector is IL25F, while its protective dummy plug is DC25F.<\/p>\n

                      BH25F vs. BH25M<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                      Feature<\/th>\nBH25F<\/th>\nBH25M<\/th>\n<\/tr>\n
                      \u30b3\u30cd\u30af\u30bf\u30fc\u30fb\u30bf\u30a4\u30d7<\/td>\nFemale Bulkhead<\/td>\nMale Bulkhead<\/td>\n<\/tr>\n
                      \u30b3\u30f3\u30bf\u30af\u30c8\u6570<\/td>\n25<\/td>\n25<\/td>\n<\/tr>\n
                      Contact Gender<\/td>\nFemale<\/td>\nMale<\/td>\n<\/tr>\n
                      Standard Housing<\/td>\n316L\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc<\/td>\n316L\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc<\/td>\n<\/tr>\n
                      Rated Voltage<\/td>\n550V AC\/DC<\/td>\n550V AC\/DC<\/td>\n<\/tr>\n
                      Nominal Current<\/td>\n5A per Contact<\/td>\n5A per Contact<\/td>\n<\/tr>\n
                      Standard Internal Leads<\/td>\n0.3 m<\/td>\n0.3 m<\/td>\n<\/tr>\n
                      \u53d6\u4ed8\u30cd\u30b8<\/td>\n3\/4-16 UNF-2A<\/td>\n3\/4-16 UNF-2A<\/td>\n<\/tr>\n
                      Primary Mating Connector<\/td>\nIL25M<\/td>\nIL25F<\/td>\n<\/tr>\n
                      Protective Dummy Plug<\/td>\nDC25M<\/td>\nDC25F<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      Both models provide high-density bulkhead connections for appropriately designed subsea electrical systems.<\/p>\n

                      The correct gender configuration must be selected according to the external cable connector.<\/p>\n

                      Typical Applications of BH25F Underwater Connectors<\/h2>\n

                      1. Remotely Operated Vehicles (ROVs)<\/h3>\n

                      ROVs require reliable electrical interfaces between sealed pressure housings and external equipment.<\/p>\n

                      The BH25F can provide a high-density electrical connection for suitable sensor, instrumentation, control, and monitoring circuits.<\/p>\n

                      Its twenty-five-contact arrangement may help reduce the number of separate housing penetrations.<\/p>\n

                      2. Autonomous Underwater Vehicles (AUVs)<\/h3>\n

                      AUVs frequently incorporate modular electronic equipment and external scientific instruments.<\/p>\n

                      The BH25F provides a fixed electrical interface for appropriate AUV sensor and monitoring systems.<\/p>\n

                      Its detachable mating configuration supports external cable replacement and equipment maintenance.<\/p>\n

                      3. Sonar and Hydrophone Systems<\/h3>\n

                      Underwater acoustic instruments may require numerous electrical channels for measurement, sensor excitation, monitoring, and control.<\/p>\n

                      The BH25F provides twenty-five contact positions for suitable acoustic instrumentation.<\/p>\n

                      For sensitive analog signals, appropriate shielding, grounding, conductor pairing, and electromagnetic interference control should be considered.<\/p>\n

                      4. Oceanographic Research Instruments<\/h3>\n

                      Marine scientific instruments often require multiple electrical circuits through sealed housings.<\/p>\n

                      The BH25F can be incorporated into suitable:<\/p>\n

                        \n
                      • Oceanographic data acquisition systems<\/li>\n
                      • Marine environmental monitoring platforms<\/li>\n
                      • Scientific sensor arrays<\/li>\n
                      • Underwater acoustic instruments<\/li>\n
                      • Seabed observation equipment<\/li>\n
                      • Deep-water measurement systems<\/li>\n<\/ul>\n

                        5. Underwater Cameras and Imaging Systems<\/h3>\n

                        Subsea imaging equipment may require multiple circuits for power, control, and auxiliary sensors.<\/p>\n

                        The BH25F can provide a fixed electrical interface through a properly designed underwater camera or electronics housing.<\/p>\n

                        Compatibility with high-speed data protocols must be evaluated using the complete cable and electrical system specifications.<\/p>\n

                        6. Offshore Monitoring Equipment<\/h3>\n

                        Offshore monitoring systems may operate under prolonged seawater exposure, mechanical loading, and high hydrostatic pressure.<\/p>\n

                        The BH25F provides a durable bulkhead connection for appropriately designed subsea instrumentation and monitoring systems.<\/p>\n

                        7. Marine Research and Testing Equipment<\/h3>\n

                        Underwater equipment manufacturers and research organizations often require customized electrical interfaces for experimental instruments.<\/p>\n

                        The BH25F provides a Standard Circular high-density bulkhead connection suitable for appropriate prototype, scientific, and testing applications.<\/p>\n

                        BH25F Installation Guidelines<\/h2>\n

                        Step 1: Verify the Mechanical Drawing<\/h3>\n

                        Confirm the 3\/4-16 UNF-2A mounting thread, 25 mm nominal thread length, mounting opening, and sealing dimensions.<\/p>\n

                        Always use the approved BH25F installation drawing before machining the pressure housing.<\/p>\n

                        Step 2: Inspect the Connector<\/h3>\n

                        Check the stainless steel housing, mounting thread, female electrical contacts, and sealing surfaces for visible damage.<\/p>\n

                        Step 3: Prepare the Equipment Housing<\/h3>\n

                        Machine the mounting opening according to the approved technical drawing.<\/p>\n

                        Ensure the sealing surface is free from burrs, scratches, dirt, and contamination.<\/p>\n

                        Step 4: Inspect and Install the O-Ring<\/h3>\n

                        Verify the specified O-ring dimensions and material.<\/p>\n

                        Inspect the seal for damage before installation and follow the approved sealing procedure.<\/p>\n

                        Step 5: Mount the BH25F<\/h3>\n

                        Position the bulkhead connector through the prepared enclosure opening.<\/p>\n

                        Secure it using the appropriate mounting nut and approved tightening procedure.<\/p>\n

                        Step 6: Connect the Internal Wiring<\/h3>\n

                        Route the internal wire leads to the appropriate equipment electronics.<\/p>\n

                        Verify the pin assignments and conductor identification before making electrical connections.<\/p>\n

                        Step 7: Mate the IL25M Connector<\/h3>\n

                        Inspect both mating interfaces for contamination and mechanical damage.<\/p>\n

                        Align the IL25M male inline connector with the BH25F female bulkhead and complete the connection using the approved mating procedure.<\/p>\n

                        Step 8: Verify Electrical and Sealing Performance<\/h3>\n

                        Perform the required electrical checks and verify the completed enclosure sealing arrangement.<\/p>\n

                        For pressure-critical equipment, confirm that the complete installation meets the intended operating conditions.<\/p>\n

                        Quality Control and Testing<\/h2>\n

                        HYSF SUBSEA manufactures underwater electrical connectors and customized subsea interconnection assemblies.<\/p>\n

                        Depending on the product configuration and project specifications, quality-control procedures may include:<\/p>\n

                          \n
                        • Hydrostatic pressure testing<\/li>\n
                        • Electrical continuity testing<\/li>\n
                        • Insulation resistance measurement<\/li>\n
                        • Dielectric withstand testing<\/li>\n
                        • Contact inspection<\/li>\n
                        • Dimensional verification<\/li>\n
                        • O-ring sealing inspection<\/li>\n
                        • Internal wiring verification<\/li>\n
                        • Mechanical integrity evaluation<\/li>\n<\/ul>\n

                          Testing requirements and acceptance criteria depend on the approved configuration and intended operating environment.<\/p>\n

                          Frequently Asked Questions<\/h2>\n

                          Q1: What is the BH25F underwater connector?<\/h3>\n

                          The BH25F is a 25-pin female bulkhead underwater electrical connector<\/strong> belonging to the HYSF Standard Circular Series.<\/p>\n

                          It provides multiple electrical connections through sealed subsea equipment housings.<\/p>\n

                          Q2: Which connector mates with BH25F?<\/h3>\n

                          The primary mating connector is the IL25M 25-Pin Male Inline Underwater Connector<\/strong>.<\/p>\n

                          Q3: Is BH25F compatible with SubConn?<\/h3>\n

                          The BH25F is designed for mating compatibility with corresponding SubConn Standard Circular 25-pin interfaces.<\/p>\n

                          Exact compatibility should be verified using the relevant technical drawings.<\/p>\n

                          Q4: What is the rated current?<\/h3>\n

                          The nominal rated current is 5A per contact<\/strong>.<\/p>\n

                          Selected higher-current configurations may support up to 10A, subject to confirmation of the approved contact arrangement.<\/p>\n

                          Q5: What is the rated voltage?<\/h3>\n

                          The Standard Circular series is rated for 550V AC\/DC<\/strong>.<\/p>\n

                          Q6: What is the maximum operating depth?<\/h3>\n

                          The connector family is designed for applications up to 6,000 meters (60 MPa)<\/strong>, subject to qualification of the complete installation.<\/p>\n

                          Q7: What is the mounting thread size?<\/h3>\n

                          The standard BH25F mounting thread is 3\/4-16 UNF-2A<\/strong>.<\/p>\n

                          Q8: What is the standard thread length?<\/h3>\n

                          The nominal mounting thread length is 25 mm<\/strong>.<\/p>\n

                          Q9: What is the standard housing material?<\/h3>\n

                          The standard BH25F housing is manufactured from 316L\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc<\/strong>.<\/p>\n

                          Q10: What is the standard internal wire length?<\/h3>\n

                          The BH25F is normally supplied with approximately 0.3 meters of internal wire leads<\/strong>.<\/p>\n

                          Q11: Can the internal wire length be customized?<\/h3>\n

                          Yes. Customized internal wire lengths and termination arrangements may be specified according to project requirements.<\/p>\n

                          Q12: Is BH25F wet-mateable?<\/h3>\n

                          Yes. The BH25F belongs to the HYSF wet-mateable Standard Circular connector family.<\/p>\n

                          Electrical power should be isolated before mating or unmating unless energized operation has been specifically qualified.<\/p>\n

                          Q13: Which dummy plug protects BH25F?<\/h3>\n

                          The corresponding protective accessory is the DC25M 25-Pin Male Dummy Plug<\/strong>.<\/p>\n

                          Q14: What is the difference between BH25F and BH25M?<\/h3>\n

                          BH25F has twenty-five female contacts and primarily mates with IL25M.<\/p>\n

                          BH25M has twenty-five male contacts and primarily mates with IL25F.<\/p>\n

                          Q15: Can BH25F be installed in an aluminum housing?<\/h3>\n

                          Installation may be possible when the mounting dimensions and sealing requirements are suitable.<\/p>\n

                          Potential galvanic corrosion between stainless steel and aluminum components should be evaluated.<\/p>\n

                          Q16: Can BH25F support Ethernet communication?<\/h3>\n

                          The BH25F provides twenty-five electrical contacts, but contact count alone does not guarantee Ethernet compatibility.<\/p>\n

                          The complete cable design must satisfy the relevant impedance, conductor pairing, shielding, and signal performance requirements.<\/p>\n

                          Why Choose HYSF SUBSEA BH25F?<\/h2>\n

                          The HYSF SUBSEA BH25F 25-Pin Female Bulkhead Underwater Connector<\/strong> provides a durable high-density electrical interface for marine and subsea equipment.<\/p>\n

                          Its main advantages include:<\/p>\n

                            \n
                          • Twenty-five gold-plated female electrical contacts<\/li>\n
                          • SubConn-compatible Standard Circular mating interface<\/li>\n
                          • Wet-mateable underwater connector design<\/li>\n
                          • Nominal 5A per contact rating<\/li>\n
                          • Selected higher-current configurations subject to verification<\/li>\n
                          • 550V AC\/DC rated voltage<\/li>\n
                          • Design depth capability up to 6,000 meters<\/li>\n
                          • Corrosion-resistant 316L stainless steel housing<\/li>\n
                          • Precision 3\/4-16 UNF-2A mounting thread<\/li>\n
                          • Standard 0.3-meter internal wire leads<\/li>\n
                          • O-ring bulkhead sealing<\/li>\n
                          • Compatible IL25M male inline connector<\/li>\n
                          • Corresponding DC25M protective dummy plug<\/li>\n
                          • Customized wiring and material configurations<\/li>\n
                          • 12-month product warranty<\/li>\n<\/ul>\n

                            For underwater robotic vehicles, sonar systems, oceanographic instruments, offshore monitoring equipment, and deep-sea research platforms, the BH25F provides a practical solution for routing multiple electrical circuits through a single sealed equipment housing penetration.<\/p>\n

                            Its high-density contact configuration, durable metal housing, and compatibility with established Standard Circular connector interfaces make the BH25F suitable for demanding subsea electrical integration applications.<\/p>","protected":false},"excerpt":{"rendered":"

                            The HYSF SUBSEA BH25F 25-Pin Female Bulkhead Underwater Connector<\/strong> is a high-density, pressure-resistant subsea electrical connector designed for reliable multi-channel power, signal, and control connections through underwater equipment enclosures.<\/p>\n

                            As part of the HYSF Standard Circular Series, the BH25F features twenty-five gold-plated female electrical contacts<\/strong>, a corrosion-resistant 316L stainless steel housing<\/strong>, and an O-ring bulkhead sealing arrangement.<\/p>\n

                            The connector is designed for underwater applications at depths of up to 6,000 meters (60 MPa)<\/strong>, with a rated voltage of 550V AC\/DC<\/strong> and a nominal current rating of 5A per contact<\/strong>, subject to qualification of the complete connector assembly.<\/p>\n

                            Selected higher-current configurations may support up to 10A, depending on the approved contact arrangement and internal wiring specifications.<\/p>\n

                            The BH25F features a 3\/4-16 UNF-2A mounting thread<\/strong>, a nominal 25 mm thread length<\/strong>, and approximately 0.3 meters of internal wire leads<\/strong>.<\/p>\n

                            It is designed to mate with the IL25M 25-Pin Male Inline Underwater Connector<\/strong> and is compatible with corresponding SubConn and SEACON Standard Circular connector interfaces.<\/p>\n

                            \u4e3b\u306a\u4ed5\u69d8<\/h3>\n
                              \n
                            • Model:<\/strong> BH25F<\/li>\n
                            • Brand:<\/strong> HYSF SUBSEA<\/li>\n
                            • Product Type:<\/strong> 25-Pin Female Bulkhead Underwater Connector<\/li>\n
                            • Series:<\/strong> Standard Circular<\/li>\n
                            • Contact Configuration:<\/strong> 25 Female Contacts<\/li>\n
                            • Contact Finish:<\/strong> Gold-Plated<\/li>\n
                            • Standard Housing Material:<\/strong> 316L\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc<\/li>\n
                            • Rated Voltage:<\/strong> 550V AC\/DC<\/li>\n
                            • Nominal Rated Current:<\/strong> 5A per Contact<\/li>\n
                            • Selected Higher-Current Configurations:<\/strong> Up to 10A, Subject to Verification<\/li>\n
                            • Design Depth:<\/strong> Up to 6,000 Meters<\/li>\n
                            • Pressure Capability:<\/strong> Up to 60 MPa<\/li>\n
                            • Mounting Thread:<\/strong> 3\/4-16 UNF-2A<\/li>\n
                            • Nominal Thread Length:<\/strong> 25 mm<\/li>\n
                            • Base Mounting Radius:<\/strong> 32.4 mm<\/li>\n
                            • Standard Internal Wire Length:<\/strong> 0.3 Meter<\/li>\n
                            • Sealing System:<\/strong> O-Ring<\/li>\n
                            • Mating Type:<\/strong> Wet-Mateable<\/li>\n
                            • Primary Mating Connector:<\/strong> IL25M<\/li>\n
                            • Protective Dummy Plug:<\/strong> DC25M<\/li>\n
                            • Compatibility:<\/strong> Corresponding SubConn and SEACON Standard Circular Interfaces<\/li>\n
                            • \u30ab\u30b9\u30bf\u30de\u30a4\u30ba\uff1a<\/strong> Internal Wire Lengths, Housing Materials, Contact Configurations, and Termination Options<\/li>\n
                            • Warranty:<\/strong> 12 Months<\/li>\n<\/ul>\n

                              Typical Applications<\/h3>\n

                              The BH25F is suitable for:<\/p>\n

                                \n
                              • Remotely Operated Vehicles (ROVs)<\/li>\n
                              • Autonomous Underwater Vehicles (AUVs)<\/li>\n
                              • Sonar and Hydrophone Arrays<\/li>\n
                              • Oceanographic Research Instruments<\/li>\n
                              • Underwater Sensor Networks<\/li>\n
                              • Marine Environmental Monitoring<\/li>\n
                              • Underwater Camera Systems<\/li>\n
                              • Offshore Inspection Equipment<\/li>\n
                              • Subsea Electronic Control Modules<\/li>\n
                              • Deep-Sea Scientific Equipment<\/li>\n
                              • Underwater Pressure Housings and Junction Boxes<\/li>\n<\/ul>\n

                                Custom Bulkhead Connector Configurations<\/h3>\n

                                HYSF SUBSEA supports customized BH25F configurations, including alternative internal wire lengths, conductor identification, housing materials, and specialized electrical terminations.<\/p>\n

                                The standard BH25F includes approximately 0.3 meters of internal wire leads<\/strong>, while custom configurations can be evaluated according to the electrical and mechanical requirements of the equipment.<\/p>\n

                                Important:<\/strong> The nominal current rating of the 25-pin configuration is 5A per contact. Higher-current contact ratings require verification and should not be assumed to apply to every contact.<\/p>\n

                                The BH25F provides a durable, high-density underwater electrical connection solution for subsea equipment requiring multiple circuits through a sealed pressure housing.<\/p>","protected":false},"featured_media":9386,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[30],"product_cat":[32],"product_tag":[],"class_list":["post-9385","product","type-product","status-publish","has-post-thumbnail","product_brand-hysf","product_cat-standard-circular-connectors","first","instock","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/product\/9385","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/comments?post=9385"}],"version-history":[{"count":1,"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/product\/9385\/revisions"}],"predecessor-version":[{"id":9387,"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/product\/9385\/revisions\/9387"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/media\/9386"}],"wp:attachment":[{"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/media?parent=9385"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/product_brand?post=9385"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/product_cat?post=9385"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hysfsubsea.com\/ja\/wp-json\/wp\/v2\/product_tag?post=9385"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}