Midland Industries SS306-04 Bulkhead Locknut 1/4in Female Jic

Product Description

The MIDLAND INDUSTRIES SS306-04 is a bulkhead locknut designed to secure hydraulic and fluid fittings through panel or bulkhead installations. Machined from 316 stainless steel, this locknut provides strong corrosion resistance in harsh chemical, marine, and high-temperature environments. It features a 1/4-inch Female JIC connection with a 7/16-20 thread size, rated to 5000 psi working pressure and up to 1000 degrees F. The compact profile measures 0.279 inches in length with an 11/16-inch hex for standard wrench engagement. Plumbers, hydraulic technicians, and industrial pipefitters install this type of fitting where lines must pass through a panel or bulkhead wall with a secure, leak-resistant seat.

This bulkhead locknut suits residential and commercial fluid systems requiring a reliable JIC-style panel mount. Typical applications include hydraulic circuits, fuel delivery lines, instrumentation tubing, and process piping where a fitting must be anchored flush to a panel surface. The 316 stainless steel construction makes it well suited for saltwater, chemical processing, and high-temperature service. The Female JIC seat ensures compatibility with standard 37-degree flare fittings common in hydraulic and refrigeration line sets.

Key Features

• 316 stainless steel construction for superior corrosion resistance in marine and chemical environments
• Rated to 5000 psi working pressure for high-pressure hydraulic and fluid applications
• Temperature rating up to 1000 degrees F for demanding service conditions
• 1/4-inch Female JIC connection with 37-degree flare seat for standard hydraulic line compatibility
• 7/16-20 thread size for precise panel and bulkhead mounting
• 11/16-inch hex allows engagement with standard open-end or combination wrenches

Compatibility

Designed as an OEM-style replacement or addition in stainless steel JIC adapter assemblies, specifically within the SS0306 Series Bulkhead Locknut line. Compatible with standard 37-degree JIC flare fittings using a 7/16-20 thread size.

Installation Notes

Installation is typically performed by licensed plumbers, hydraulic technicians, or industrial pipefitters. Depressurize and drain the fluid system completely before removing or installing any fittings. Use an appropriately sized open-end or combination wrench on the 11/16-inch hex; avoid using pipe wrenches that can deform the hex flats. Verify thread engagement and seating against applicable system pressure ratings before returning the line to service.