Midland Industries 39774 Solid Pin 7-way Socket

Product Description

The MIDLAND INDUSTRIES 39774 is a solid pin 7-way socket designed for air brake trailer wiring connections. The metal body construction provides durability in demanding commercial vehicle and fleet service environments. At 0.52 pounds and compact dimensions, it fits into standard trailer nose box installations without modification. The 7-way configuration supports the full range of trailer lighting, brake, and auxiliary circuits required by DOT-compliant tractor-trailer setups. This fitting is handled by fleet technicians, heavy truck mechanics, and trailer service shops.

This socket is categorized under air brake accessories and brass fittings, indicating application in commercial vehicle air brake and electrical systems. The 7-way socket style is the standard connector format for Class 7 and Class 8 tractor-trailer combinations, as well as heavy-duty flatbed, dry van, and refrigerated trailer configurations. It is typically installed at the trailer nose box or on the tractor rear apron plate where the umbilical connection is made between tractor and trailer.

Key Features

• Solid pin design for secure, low-resistance electrical contact
• Metal body construction for resistance to road vibration, moisture, and mechanical wear
• 7-way configuration supports lighting, electric brakes, and auxiliary circuits
• Compact footprint at 3 inches length by 2.85 inches width by 2.85 inches height
• Low minimum order quantity suitable for single-unit service replacement

Compatibility

Designed as an OEM-style replacement 7-way trailer socket for commercial tractor-trailer air brake and electrical systems requiring a standard solid pin connector format.

Installation Notes

Installation is performed by qualified heavy truck or trailer technicians. Disconnect shore power and verify the tractor is shut down and all trailer circuits are de-energized before replacing the socket. Secure all wiring connections per SAE J560 wiring color and pin assignment conventions and confirm the mounting hardware is torqued to the chassis manufacturer's specification. Inspect the socket housing and seal condition before returning the unit to service.