Proto J5210B 5/16 Inch 12-point Hand Socket 3/8 Drive

Product Description

The PROTO J5210B is a 5/16 inch, 12-point hand socket designed for use with a 3/8 inch drive ratchet or breaker bar. Constructed from alloy steel with a black oxide finish, this socket delivers reliable torque transfer on fasteners where 12-point access is required. The 12-point geometry allows engagement at 30-degree increments, making it useful in tight or restricted fastener access situations. With an overall length of 1-3/32 inches, it fits standard socket trays and tool organizers. This socket meets ANSI standard B107.1, confirming dimensional and performance compliance for professional hand tool use.

This socket suits residential, commercial, and industrial service work across the HVAC, plumbing, electrical, and mechanical trades. It is appropriate for equipment assembly, panel work, mechanical fastening on fan assemblies, compressor brackets, and general service tasks wherever a 5/16 inch, 12-point fastener is encountered. It is not tether capable, so it is intended for standard ground-level or bench service applications rather than overhead or elevated work requiring tethered tools.

Key Features

• 5/16 inch socket size fits corresponding hex and 12-point fasteners
• 12-point design allows engagement every 30 degrees for use in restricted spaces
• 3/8 inch drive compatible with standard ratchets and extensions
• Alloy steel construction for strength under torque
• Black oxide finish for corrosion resistance and reduced glare
• Meets ANSI B107.1 dimensional and performance standards
• Limited lifetime warranty from the manufacturer

Compatibility

Designed for use with any 3/8 inch drive ratchet, extension bar, or torque wrench. Compatible with standard 3/8 inch drive socket accessories.

Installation Notes

Install and remove using a 3/8 inch drive ratchet or torque wrench appropriate for the fastener application. Ensure the socket is fully seated on the fastener before applying torque to prevent rounding. This socket is not tether capable and should not be used in elevated work environments where dropped-tool controls require tethered equipment. Inspect the socket for cracks or wear before each use and replace if deformation is observed.