Milwaukee Tool 49-66-5111 Spline Drive Impact Socket

Product Description

The MILWAUKEE TOOL 49-66-5111 is a spline drive impact socket designed for use with 1/2 inch drive impact wrenches and pin detent tools. Built to handle high-torque applications, this socket features a 3/4 inch hex size and a 0.75 x 0.5625 inch socket size, making it well-suited for fastener work in demanding trade environments. The black oxide finish adds corrosion resistance. Six-point contact geometry reduces rounding of fastener heads under load. A built-in pin detent hole allows secure locking onto pin detent tools and adapters, preventing unintended socket ejection during use.

This impact socket is intended for professional use in mechanical, electrical, plumbing, and general construction applications where 1/2 inch drive impact tools are standard. It is appropriate for both residential and light commercial jobsite work. The spline drive design engages the socket at multiple contact points, distributing torque load more evenly than standard square drive configurations. Electricians, pipefitters, and mechanical contractors frequently use impact sockets of this type when installing conduit fittings, pipe flanges, and structural hardware.

Key Features

• 1/2 inch drive size compatible with standard impact wrenches and pin detent adapters
• 3/4 inch hex size for common structural and mechanical fasteners
• Spline drive engagement for improved torque transfer under impact conditions
• Six-point socket geometry minimizes fastener rounding
• Pin detent hole locks socket securely onto pin detent tools and adapters
• Black oxide finish for corrosion resistance in field conditions

Compatibility

Designed as an OEM-style replacement and standard fitment impact socket for 1/2 inch drive impact wrenches and pin detent drive tools.

Installation Notes

This socket is installed and removed by hand when changing tooling on impact wrenches. Ensure the impact wrench or drive tool is fully powered down or disconnected from its power source before changing sockets. Always confirm the pin detent is fully seated in the detent hole before applying torque. Impact sockets should not be used with hand ratchets, as impact-rated and hand-tool-rated sockets have different metallurgical properties.