Proto J5122 Open End Torque Adapter 11/16 in 3/8 in Drive

Product Description

The PROTO J5122 is a 12-point open end torque adapter designed to transfer torque from a 3/8 inch drive torque wrench to fasteners that require an open-end fitting. Built from chrome-plated steel, this adapter features a 1 inch head diameter and a head thickness of 27/64 inches, keeping the profile compact for use in tight spaces. The overall length is 2-29/32 inches. It is rated to meet AS954E S3.8.1 standards. Licensed mechanics, maintenance technicians, and industrial tradespeople use this adapter when a standard socket cannot reach or fit the fastener geometry.

The J5122 is suited for both shop and field use wherever a 3/8 inch drive torque wrench is the primary tool. The 11/16 inch open end size covers a range of common fastener sizes found in mechanical assemblies, HVAC equipment, and general industrial maintenance. The tether-capable design makes it appropriate for elevated or overhead work environments where dropped-tool prevention is required. It is not insulated and is not rated for non-sparking applications.

Key Features

• 12-point box end head for positive engagement on fasteners
• 3/8 inch drive accepts standard torque wrenches and drive tools
• Chrome-plated steel construction for corrosion resistance and durability
• Compact 27/64 inch head thickness for access in confined spaces
• Tether-capable design for use in elevated work environments
• Meets AS954E S3.8.1 standard

Compatibility

Designed for use with 3/8 inch drive torque wrenches and compatible with standard fasteners requiring an 11/16 inch open end fitting.

Installation Notes

This adapter is installed by mechanical technicians and maintenance professionals using standard 3/8 inch drive torque equipment. Verify that the torque wrench and adapter are fully seated before applying torque to avoid slippage or fastener damage. Do not use impact drivers with this adapter unless the tool is rated for impact use. When working at height, use the tether attachment point with an appropriate lanyard to comply with dropped-tool prevention requirements.