Proto J5278AM 12-point Hand Socket 15 Mm 3/8 Drive

Product Description

The PROTO J5278AM is a 12-point hand socket designed for 3/8 inch drive ratchets and breaker bars. Built from alloy steel with a chrome-plated finish, it fits a 15 mm fastener and measures 1-7/8 inches in overall length. The 12-point configuration allows engagement at 30-degree increments, giving technicians more positional options in tight spaces. This socket meets ASME B107.5M standards, making it a reliable choice for professional use in automotive, industrial, and mechanical service environments where hand-tool quality and dimensional accuracy matter.

This socket is suited for general mechanical work including automotive service, equipment maintenance, and industrial assembly. The 3/8 inch drive size makes it compatible with a wide range of common ratchets, extensions, and drive accessories found in trade toolkits. The 15 mm size covers fasteners frequently encountered on domestic and imported vehicles as well as light industrial machinery. Licensed mechanics, fleet technicians, and equipment service professionals are the primary users of this socket.

Key Features

• 12-point design allows engagement at 30-degree increments for use in confined areas
• 3/8 inch drive fits standard ratchets, extensions, and flex handles
• Alloy steel construction provides durability under torque
• Chrome-plated finish resists corrosion and simplifies cleaning
• Meets ASME B107.5M dimensional and performance standards
• Compact 1-7/8 inch overall length suits low-clearance applications

Compatibility

Designed as an OEM-style hand socket for use with 3/8 inch drive ratchets, breaker bars, and extensions in standard professional and industrial tool sets.

Installation Notes

This socket is installed by hand tool professionals including automotive technicians and equipment mechanics. Ensure the socket is fully seated on the fastener before applying torque to prevent rounding. Inspect the drive square and socket walls for wear or cracking before each use. This part is not tether capable and should not be used in tethered tool applications or overhead work requiring drop prevention.