Milwaukee Tool 49-66-6603 Impact Socket 1 in Drive 40mm

Product Description

The MILWAUKEE TOOL 49-66-6603 is a 1-inch drive, 40mm, 6-point hex impact socket built for heavy-duty fastening applications. Constructed from steel with a black phosphate finish, it resists corrosion and withstands the high-torque output of pneumatic and hydraulic impact wrenches. The 6-point design maximizes contact with fastener flats, reducing rounding under load. At standard length and rated non-sparking, this socket is suited for environments where spark risk is a concern. Licensed tradespeople including millwrights, heavy equipment mechanics, and industrial maintenance technicians will find this socket appropriate for large-fastener service work.

This socket is intended for use with 1-inch drive impact wrenches in industrial, construction, and heavy equipment maintenance settings. The 40mm socket size targets large-diameter fasteners common on heavy machinery, structural steel connections, and commercial equipment. The non-sparking rating makes it applicable in environments with flammable materials or gases where standard steel tooling may not be permitted. Standard length fits most open-access fastener positions without requiring an extension.

Key Features

• 1-inch drive for compatibility with heavy-duty impact wrenches
• 40mm 6-point hex socket for maximum fastener engagement and reduced rounding
• Non-sparking rating suitable for use in potentially flammable environments
• Steel construction with black phosphate finish for corrosion resistance
• Standard length profile fits most direct-access fastening applications
• Not insulated — not rated for live electrical work

Compatibility

Designed as an OEM-style impact socket for use with standard 1-inch drive impact wrenches and torque multipliers in heavy-duty industrial and construction applications.

Installation Notes

Installation and service using this socket should be performed by qualified mechanics or tradespeople familiar with heavy-duty impact tooling. Ensure the impact wrench is depressurized or powered down before changing sockets. Confirm the socket is fully seated on the drive anvil and retaining pin or ring is secured before applying torque. While rated non-sparking, always follow site-specific safety protocols when working in classified hazardous environments.