#4 Steel Bulkhead Locknu

The #4 Steel Bulkhead Locknut from AEROQUIP is a critical hydraulic fitting component engineered for high-pressure fluid systems in tactical vehicles, aircraft, and military equipment. This locknut secures bulkhead connections in demanding environments where vibration, thermal cycling, and extreme pressure demand absolute reliability. Whether you're maintaining law enforcement fleet hydraulics, military transport systems, or tactical gear hydraulic assemblies, this fastener ensures connections remain tight and leak-free under operational stress.

Constructed from hardened steel with corrosion-resistant properties, the #4 bulkhead locknut features a design optimized for secure hand-tightening without over-torque risk to fragile hydraulic ports. The locknut profile prevents accidental loosening from vibration—a common failure mode in mobile tactical platforms. AEROQUIP's precision manufacturing ensures concentricity and thread integrity that meet military hydraulic standards, delivering consistent performance across thousands of pressurization cycles. At just 0.05 lbs, this compact fitting (2.35 x 1.1 x 3.7 inches) integrates seamlessly into space-constrained hydraulic manifolds and valve assemblies.

This locknut is ideal for combat vehicle maintainers, military mechanics, and tactical equipment technicians performing hydraulic system repairs or upgrades. It pairs with #4 SAE bulkhead fittings and is compatible with standard -4 JIC (37-degree) hydraulic hoses. Installation requires only basic hand tools and torque awareness—over-tightening can damage the fitting body, so controlled hand-tightening to a snug position is the correct procedure. Stock this specification for preventive maintenance programs and emergency field repairs where system integrity cannot be compromised.