Proto J5278A 11/16 Inch 12-point 3/8 Drive Hand Socket

Product Description

The PROTO J5278A is an 11/16 inch, 12-point hand socket designed for professional-grade fastener work. Built from alloy steel with a chrome-plated finish, it fits a 3/8 inch drive ratchet or breaker bar. The 12-point configuration engages hex fasteners at 30-degree increments, giving the technician more swing options in tight clearances. At 1-31/32 inches overall length and weighing 0.18 pounds, it is compact enough for confined spaces without sacrificing grip or torque transfer. This socket meets ANSI B107.1 standards and is intended for use by mechanics, HVAC technicians, plumbers, and other trade professionals who require reliable hand tools in daily service work.

The J5278A is suited for residential and light commercial applications where a 3/8 inch drive socket set is the primary tool. Common installation and service scenarios include mechanical equipment access panels, fastener removal on HVAC components, plumbing fixture hardware, and general mechanical assembly. The chrome finish resists corrosion in typical shop and field environments. This socket is not tether-capable, so it is not rated for elevated or overhead work requiring tool retention systems.

Key Features

• 11/16 inch socket size fits standard hex fasteners of that dimension
• 12-point design allows engagement at 30-degree increments for restricted-swing situations
• 3/8 inch drive compatible with standard ratchets, extensions, and breaker bars
• Alloy steel construction with chrome-plated finish for durability and corrosion resistance
• Meets ANSI B107.1 standards for hand socket tools
• Compact overall length of 1-31/32 inches for use in confined spaces

Compatibility

Designed as an OEM-style hand socket for use with standard 3/8 inch drive tool systems in professional trade and mechanical service applications.

Installation Notes

Install and remove fasteners using a 3/8 inch drive ratchet, breaker bar, or torque wrench. Ensure the socket is fully seated on the fastener before applying torque to avoid rounding. Power down or de-energize equipment before accessing fasteners on electrical or mechanical systems. This socket is not tether-capable and should not be used in overhead applications where dropped-tool hazards exist.