Proto J8179-T500 Box End Wrench 1/4 X 5/16 in 12 Point

Product Description

The PROTO J8179-T500 is a double-end box wrench sized 1/4 inch by 5/16 inch with a 12-point configuration on each end. Constructed from steel with a polished finish, this wrench delivers reliable grip on hex fasteners in confined spaces where an open-end wrench cannot seat properly. The 12-point design allows more engagement positions per revolution, reducing the arc needed to reposition the wrench. At 6.59 inches in length and 0.131 pounds, it is compact enough for tight quarters while providing sufficient leverage for standard fastener torque. Mechanics, pipefitters, HVAC technicians, and electricians reach for this tool when working on equipment panels, valve assemblies, and terminal hardware requiring fractional inch fastener sizes.

This wrench is suited for light mechanical and service work across residential and commercial applications. Common use cases include tightening or loosening small fasteners on HVAC equipment covers, electrical panel hardware, plumbing fixture connections, and instrumentation assemblies. The 1/4 inch and 5/16 inch ends cover two of the most common small fractional fastener sizes found on trade equipment. The polished steel finish resists surface corrosion under normal service conditions and allows for easy cleaning after use.

Key Features

• Double-end design provides 1/4 inch and 5/16 inch box openings in a single tool
• 12-point box ends allow fastener engagement every 30 degrees for use in restricted swing areas
• Steel construction with polished finish for durability and corrosion resistance
• Non-ratcheting design eliminates internal mechanism failure points
• Meets ASME B107.10 standards for hand tools
• Lifetime warranty from the manufacturer

Compatibility

Designed for use with 1/4 inch and 5/16 inch hex fasteners in fractional inch sizes. Suitable as a service tool across HVAC, plumbing, electrical, and general mechanical applications requiring small box-end wrenches.

Installation Notes

This tool is used by licensed tradespeople and mechanics across multiple disciplines. Always ensure the wrench is fully seated on the fastener before applying torque to avoid rounding the fastener head. Inspect the tool for cracks or deformation before each use and do not use it as a striking tool or apply additional leverage extensions beyond the handle. Store in a dry location to preserve the finish.