Proto J74421MP Impact Socket 1/2 in Drive 21mm 6-pt

Product Description

The PROTO J74421MP is a 6-point impact socket designed for heavy-duty fastening and removal applications. Built with a 1/2 inch drive and a 21mm hex opening, it seats squarely on fastener flats to reduce rounding under high-torque impact loads. The socket is machined from alloy steel for strength and impact resistance. At 2-11/16 inches overall length, it provides reach in tight or recessed installations. This socket is used by mechanics, pipefitters, electricians, and HVAC technicians working with impact wrenches or pneumatic drivers in both shop and field environments.

The J74421MP is suited for industrial maintenance, mechanical assembly, and trade service work where impact-rated tooling is required. Its universal style fits a wide range of fastening tasks across HVAC equipment, electrical enclosures, piping, and structural connections. The socket meets ASME B107.2 specifications, making it appropriate for professional and production use. Single-piece packaging makes it easy to replace or add to a socket set without purchasing a full kit.

Key Features

• 1/2 inch drive accepts standard 1/2 inch impact wrenches and drive tools
• 21mm 6-point hex socket geometry reduces fastener rounding under torque
• Alloy steel construction rated for impact driver use
• Meets ASME B107.2 specification for hand socket tools
• 2-11/16 inch overall length provides reach in recessed fastener locations
• Universal style suitable for a broad range of trade applications

Compatibility

Designed as an OEM-style replacement or add-on impact socket for use with standard 1/2 inch drive impact wrenches and ratchets in trade and industrial service applications.

Installation Notes

Install and remove using a 1/2 inch drive impact wrench or ratchet. Confirm the socket is fully seated on the fastener before applying torque to avoid slippage or fastener damage. Do not use impact sockets with non-impact hand ratchets for sustained high-torque applications, as impact-rated tools are required to handle the shock loading. Inspect the socket for cracks or wear before each use and replace if deformation is observed.