Proto J5272A Hand Socket 5/16 in 12-point 3/8 Drive

Product Description

The PROTO J5272A is a 5/16 inch, 12-point hand socket designed for professional-grade fastener work across a range of trade applications. Built from alloy steel with a chrome-plated finish, this socket accepts a 3/8 inch drive and is engineered to meet ASME B107.1 standards. The universal/flex socket type adds versatility in confined or angled access situations. Weighing just 0.12 pounds, it is compact and well-suited for toolbox carry in HVAC, plumbing, electrical, and general mechanical service. Licensed tradespeople and journeymen who need a reliable, code-conforming socket for tight fastener work will find this a capable addition to their hand tool kit.

The J5272A is used wherever a 5/16 inch fastener requires precise torque application with a 3/8 inch drive ratchet or breaker bar. Its 12-point profile engages hex and double-hex fastener heads and is practical for residential and light commercial service calls, panel work, equipment mounting, and fixture installation. The universal/flex design makes it especially useful when working around obstructions or at off-angles where a standard socket cannot seat cleanly.

Key Features

• 5/16 inch socket size with 12-point configuration for broad fastener engagement
• 3/8 inch drive compatibility for use with standard ratchets and extensions
• Universal/flex socket type allows angled access in tight spaces
• Alloy steel construction with chrome-plated finish for corrosion resistance and durability
• Meets ASME B107.1 standards for hand socket tools
• Compact profile at 1.75 inches height for use in confined work areas

Compatibility

Designed for use with 3/8 inch drive ratchets, extensions, and torque wrenches as an OEM-style hand socket replacement or addition to any professional hand tool set.

Installation Notes

This socket is installed and removed by hand tool users across multiple trades including HVAC, electrical, and plumbing. Always ensure the drive connection is fully seated before applying torque to avoid rounding fastener heads or damaging the drive lug. Inspect the socket for cracks or wear before each use. Follow applicable safety standards and manufacturer torque guidance for the fasteners being serviced.