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What size O-rings are used for the Bulkhead connectors?

HYSF uses industry-standard O-ring sizes to facilitate easy maintenance. For the Micro Series (7/16-20 thread), the standard O-ring is typically Size 2-014 (Standard AS568). For the Standard Series, it varies by shell size. We recommend using Nitrile (Buna-N) 70 or 90 durometer O-rings for general use, or Viton for high-temperature applications.

The O-ring is the primary seal between the bulkhead and your ROV hull.

  • Compatibility: Since our connectors are designed for “Import Substitution”, the O-ring grooves match standard global dimensions.
  • Spares: You can source these standard O-rings from any local seal supplier, or purchase pre-packaged HYSF Spare O-ring Kits to ensure you have the exact correct hardness and tolerance.
  • Installation: Always lightly grease the O-ring with Molykote before installation, and ensure it is free of hair or dust.
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John Zhang

(CEO & Lead Engineer)
Email: [email protected]
With over 15 years of expertise in subsea interconnect technology, I lead HYSF's R&D team in designing high-pressure (60MPa) solutions. My focus is on ensuring zero-leakage reliability for ROVs, AUVs, and offshore instrumentation. I personally oversee the validation of our custom connector prototypes.

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