What is the recommended installation torque for bulkheads?

Proper torque is critical to prevent damaging the O-ring or stripping the threads. While specific values depend on the material (Stainless vs. Titanium), a general rule of thumb for a 7/16-20 UNF bulkhead is 4.5 – 5.5 Nm. Always refer to the specific product datasheet and use a torque wrench.

Over-tightening is a common cause of leakage.

The Mechanism: The watertight seal is created by the O-ring compression, not by how hard you crank the nut.
Risk: Excessive torque can extrude the O-ring or crack the bulkhead seat.
Surface: Ensure the mounting surface is flat, smooth (Ra 1.6 or better), and free of burrs before applying torque.
Washer: Always use the provided washer and nut to distribute the load evenly.

John Zhang

(CEO & Lead Engineer)
Email: info@hysfsubsea.com
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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