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HYSF Blank plug

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1. Drawing information

Dimensions in mm (1 mm = 0.03937 inch)
Threads in inches (1 inch = 25.4 mm)

2. Plug Color Configuration

Available in standard Stainless Steel Silver finish with POM (Polyoxymethylene) dummy body in natural white/cream color. Custom color options for the POM dummy cap available upon request for easy visual identification in underwater applications. All metal plugs feature a high-visibility purple or black O-ring groove for quick mating status checks.

3. Main parameters

  • HYSF Underwater Blank Plug | Subsea Dummy Plug | Stainless Steel Blanking Plug for 6000m Depth | Subconn Compatible Dummy Connector

  • Depth Rating: 6000 meters

  • Matings: >1000 cycles
  • Electrical: N/A (blanking/dummy function)
  • Working Temperature: -4°C to +60°C
  • Pressure Rating: Full ocean depth (6000m)
  • Compatibility: Fully interchangeable with Subconn® blank plugs and most major subsea connector brands
  • Custom Options: Material, single or double O-ring, thread length, and custom dimensions available

4. Material & Installation Requirements

  • Plug Body: High-grade Stainless Steel (316L) – excellent corrosion resistance in seawater
  • Dummy Cap: POM (Polyoxymethylene) – high strength, low friction, and superior wear resistance
  • O-Rings: Nitrile (standard) or Viton/FKM for enhanced chemical and temperature performance
  • Optional Materials: Titanium body for ultra-lightweight and extreme corrosion resistance applications

5. Dimension & Thread Specifications

All dimensions in mm (1 inch = 25.4 mm). Threads in inches (UNF standard).

  • 7/16″ Series Thread: 7/16″-20 UNF-2A Overall Length: 19.05 mm Hex Size: Suitable for standard 7/16″ tools
  • 1/2″ Series Thread: 1/2″-20 UNF-2A Overall Length: 20 mm Hex Size: Standard 1/2″
  • 5/8″ Series Thread: 5/8″-18 UNF-2A Overall Length: 25.01 mm
  • 3/4″ Series Thread: 3/4″-16 UNF-2A Overall Length: 34.9 mm
  • 7/8″ Series Thread: 7/8″-14 UNF-1A Overall Length: 35 mm Dual O-Ring design (2-019 & 2-022) for maximum sealing reliability

HYSF underwater blank plugs are precision-engineered dummy connectors designed to protect open bulkhead connectors from seawater ingress, dirt, and pressure damage during storage, transport, or when not in use. Manufactured with premium stainless steel and POM components, these blanking plugs deliver unmatched durability and reliability for ROV, AUV, offshore oil & gas, oceanographic research, and renewable energy applications.

Fully customizable – choose single or double O-ring configuration, extended thread lengths, titanium construction, or exact Subconn® dimensional matching. Contact HYSF for OEM solutions and fast prototyping.

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Contact

Jason Liu

Chief Technical Officer

HYSF Subsea

jason@hysfsubsea.com

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Whether you need a quick quote for standard connectors or a complex custom cable assembly, our engineering team is ready to assist. Expect a technical response within 12 hours.

John Zhang

CEO

  • info@hysfsubsea.com
  • +86 13942853869
Jason Liu
Kevin Wang
Cindy Chen
Lily Li
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