Milwaukee Tool 49-66-6415 Impact Socket 3/4 in 40mm 6-pt

Product Description

The MILWAUKEE TOOL 49-66-6415 is a 3/4 inch drive, 40mm, 6-point hex impact socket designed for heavy-duty fastening applications. Built from steel with a black phosphate finish, this standard-length socket is rated non-sparking, making it suitable for use in environments where ignition risk must be controlled. It is intended for use with 3/4 inch drive impact wrenches and is a common choice for mechanical contractors, industrial maintenance techs, and fleet service professionals who work with large-format fasteners.

This socket fits into applications where high-torque impact tools are required, such as heavy equipment service, structural steel assembly, industrial machinery maintenance, and large-diameter pipe flange work. The 40mm hex size is commonly encountered in commercial and industrial settings. Standard length geometry allows use in open or moderately restricted access points without the added reach of a deep socket. The non-sparking designation makes it appropriate for use near fuel lines, gas systems, or other environments governed by spark-control requirements.

Key Features

• 3/4 inch drive fits standard heavy-duty impact wrenches
• 40mm 6-point hex geometry distributes torque evenly across fastener flats
• Non-sparking construction for use in spark-sensitive environments
• Black phosphate finish resists corrosion and reduces glare
• Standard length profile for general-access fastening tasks
• Steel construction rated for impact tool use

Compatibility

Designed as an OEM-style replacement and standard-service socket for 3/4 inch drive impact wrenches used in industrial, commercial, and heavy mechanical service applications.

Installation Notes

Installation is performed by licensed or journeyman mechanics, millwrights, or industrial maintenance technicians. Always ensure the impact wrench is de-energized and the drive retainer is fully engaged before applying torque. Do not use impact sockets with hand-drive ratchets, as impact-rated sockets and standard chrome sockets are not interchangeable under impact loads. Follow applicable workplace safety codes when operating in spark-sensitive areas.