Williams Comfort Products JHW37821 Impact Socket 21MM

Product Description

The WILLIAMS COMFORT PRODUCTS JHW37821 is a 21 MM metric universal impact socket designed for heavy-duty fastener work with pneumatic and electric impact wrenches. Built to a 3-inch overall length with a 1/2-inch drive, this socket features SUPERTORQUE lobular openings engineered to deliver greater turning power while reducing deformation of the fastener head. It is specially heat treated for impact use, making it a reliable choice for automotive, industrial, and general mechanical applications where high-torque tools are standard. Licensed tradespeople and experienced mechanics working with 1/2-inch drive impact equipment will find this socket a dependable shop and field tool.

This socket is suited for professional environments where 21 MM metric fasteners are encountered regularly, including automotive repair, fleet maintenance, heavy equipment service, and industrial assembly. The universal fitment and standard 1/2-inch drive interface make it compatible with a wide range of impact wrenches found in trade shops. The pin retention hole and groove at the drive end allow use of a retaining pin or hog ring for secure bit retention during high-torque operation.

Key Features

• SUPERTORQUE lobular openings increase turning power and protect fastener heads from rounding
• Designed for maximum engagement on 6-point fasteners
• Compatible with pneumatic and electric impact wrenches
• Specially heat treated for impact use to extend service life and maintain safety under load
• Drive end includes pin retention hole and groove for secure socket retention
• Metric sizing at 21 MM with a 3-inch overall length for reach in tight spaces

Compatibility

Designed as an OEM-style universal impact socket for use with standard 1/2-inch drive pneumatic and electric impact wrenches requiring a 21 MM metric socket.

Installation Notes

Installation and use should be performed by qualified mechanics or tradespeople familiar with impact tooling. Always power down or disconnect the impact wrench before changing sockets. Inspect the socket for cracks or wear before each use, and never use impact sockets with hand-drive ratchets. Ensure the retaining pin or hog ring is properly seated in the pin retention groove before operating at high torque.

Technical Specifications

• Drive Size: 1/2 inch
• Socket Size: 21 MM
• Overall Length (OAL): 3 inches
• Drive Type: Universal Impact
• Measurement Standard: Metric
• Length: 8 inches
• Width: 0.9 inches
• Height: 1 inch
• Weight: 5.87 pounds
• Sold As: Each

Standard Information

• Brand: WILLIAMS COMFORT PRODUCTS
• Manufacturer Part Number: JHW37821