Proto J5277A 5/8 in 12-point 3/8 Drive Hand Socket

Product Description

The PROTO J5277A is a 12-point hand socket designed for use with a 3/8-inch drive ratchet or breaker bar. It accepts a 5/8-inch fastener and features a universal flex-style socket type, giving technicians access to fasteners in tight or angled positions. The socket is machined from alloy steel and finished with a chrome plating that resists corrosion and simplifies cleanup. It meets ASME B107.1 standards for hand socket tools. Licensed tradespeople in HVAC, plumbing, and electrical work rely on this size for equipment panels, flanges, and mechanical connections where a 5/8-inch hex fastener is common.

This socket is suited for residential and light commercial service work. It fits standard 3/8-inch drive tool sets, making it compatible with the ratchets and extensions most technicians already carry. The 12-point geometry engages fasteners at more rotational positions than a 6-point, useful in confined spaces where swing arc is limited. Typical applications include equipment mounting hardware, access panel fasteners, and mechanical assembly work across HVAC, plumbing, and general mechanical trades.

Key Features

• 5/8-inch socket size for common fastener applications in mechanical trades
• 12-point design allows engagement at 30-degree increments for use in tight spaces
• Universal/flex socket type for angled fastener access
• 3/8-inch drive compatible with standard ratchets, extensions, and breaker bars
• Alloy steel construction meets ASME B107.1 hand tool standards
• Chrome finish resists corrosion and wipes clean easily

Compatibility

Designed for use with standard 3/8-inch drive ratchets, extensions, and breaker bars. Compatible with any 3/8-inch square drive hand tool following ASME B107.1 dimensional standards.

Installation Notes

This socket is a hand tool and does not require installation in the electrical or mechanical sense, but proper use practice applies. Always confirm the fastener size matches the socket before applying torque to avoid rounding. De-energize or depressurize any system before removing fasteners from live equipment. Do not use hand sockets with impact drivers unless the socket is impact-rated.