Nuts and washers

Nuts and Washers for Underwater Bulkhead Connectors

Bulkhead mounting nuts and washers provide the clamping force that draws the connector flange against the panel and compresses the O-ring face seal — the foundation of every IP68 bulkhead connector installation. The default nut material is brass; stainless steel or titanium alloy can be customised. Precision-machined with full thread engagement depth, they match the mounting threads of the connector series rather than generic hardware sizes.

Brass / 316L SS / Titanium 6 Standard UNF Sizes Full-Thread Engagement Engineered Washers 600 bar SS Hardware SubConn Compatible

Key Design Features

• Brass standard, 316L / titanium optional: naval brass gives inherent seawater resistance and suits frequent reconfiguration; passivated 316L stainless steel is the standard for permanent subsea installations; titanium for galvanic compatibility with titanium bulkheads.
• Full-thread engagement: nuts are machined with complete thread depth, unlike truncated generic nuts — full load-bearing capability on the connector bulkhead thread.
• Engineered washers: sized to the connector flange with machined-flat faces (0.05 mm tolerance) for even load distribution and panel-surface protection; recessed-centre washers available for O-ring bulkhead seals.
• Six standard thread sizes: from 3/8-24 UNF for micro connectors up to 7/8-14 UNF for large bulkheads — one nut per connector series, no adapters.
• Replacement and spares: ideal replacement hardware for in-service connector panels, ROV builds and subsea junction boxes; corrosion-seized nuts from field installations can be swapped for new hardware.
• SubConn Compatible: thread forms match standard SubConn-style bulkhead interfaces across all connector series sold on this site.

Nut & Washer Dimensions (per series drawing)

Technical Specifications

Typical Applications

Replacement mounting hardware for in-service bulkhead connector installations, new ROV and subsea equipment build connector panels, spare hardware kits for subsea maintenance teams, and panel-mount hardware for subsea junction boxes.

Notes for Selection

Do not use generic hardware-store fasteners — carbon steel rusts within weeks in seawater and zinc plating fails under galvanic attack. Specify stainless steel for permanent installations, deep water (>3,000 m) and offshore platforms; brass for commercial diving and equipment requiring frequent connector removal. For O-ring sealed bulkheads use recessed-centre washers to avoid crushing the seal during tightening. Provide your connector series (MCBH, HPBH, BCR, XSG-BCL etc.) and we will cross-reference the correct hardware automatically.