Proto J7421MT Impact Socket 1/2 in Drive 21mm 12-point

Product Description

The PROTO J7421MT is a 12-point impact socket designed for use with 1/2 inch drive impact wrenches and ratchets. Built for high-torque fastening and removal tasks, this socket accepts 21mm fasteners and measures 1.5 inches in overall length. The 12-point configuration allows engagement from multiple positions around the fastener, making it useful in tight or awkward access situations. At 0.23 pounds, it is a compact, single-piece socket suitable for professional-grade impact tool setups. Mechanics, maintenance technicians, and industrial tradespeople rely on this socket for general fastening work in automotive, equipment, and facility maintenance applications.

This socket is well-suited for automotive service, fleet maintenance, and general mechanical work where a 1/2 inch drive impact tool is the standard. The 21mm size is a common fitment for wheel lug nuts and suspension hardware on many vehicle platforms, making it a practical addition to any impact socket set. It is appropriate for both shop and field use wherever controlled impact driving of 21mm fasteners is required.

Key Features

• 1/2 inch drive size for use with standard impact wrenches and ratchets
• 21mm socket size fits common metric fasteners including wheel lug nuts
• 12-point design provides multiple engagement positions around the fastener
• 1.5 inch overall length offers a compact profile for access in confined spaces
• Lightweight at 0.23 pounds for easy handling and socket tray storage

Compatibility

Designed as an OEM-style replacement or direct-fit impact socket for 1/2 inch drive impact tools requiring a 21mm, 12-point socket.

Installation Notes

Install and remove by a qualified mechanic or maintenance technician using a compatible 1/2 inch drive impact wrench or ratchet. Ensure the fastener head is fully seated in the socket before applying torque to prevent rounding. Inspect the socket for cracks or wear before each use, and do not use hand-socket extensions on impact tools unless rated for impact service.