Milwaukee 49-66-6720 Impact Drive Adapter 1/4 to 3/8 Inch

Product Description

The MILWAUKEE 49-66-6720 is a SHOCKWAVE Impact Duty drive adapter designed to convert 1/4 inch square drive tools to accept 3/8 inch drive impact sockets. Built from forged steel, this adapter is engineered for high-torque impact applications where standard adapters can fail. Laser-etched size markings make identification fast in the field. A dual-hole design combined with a ring groove allows for quick, secure socket attachment and removal without fumbling. This adapter is rated for impact use and meets ASME industry standards, making it a reliable choice for mechanics, electricians, and general trade technicians working with mixed drive-size socket sets.

This adapter fits into standard 1/4 inch square drive impact tools and accepts 3/8 inch drive impact sockets, expanding the usable socket range of compact impact drivers and wrenches. It is well-suited for residential and commercial service work where a technician carries a single driver but needs access to both 1/4 inch and 3/8 inch drive sockets. The magnetized design helps retain sockets during use, reducing dropped hardware in tight spaces or overhead work.

Key Features

• Forged steel construction for durability in high-torque impact applications
• Converts 1/4 inch square drive tools to 3/8 inch drive impact sockets
• Laser-etched size markings for fast visual identification
• Dual-hole design and ring groove for secure, easy socket attachment and removal
• Magnetized to help retain sockets during use
• Meets ASME industry standards for socket adapters

Compatibility

Designed for use with 1/4 inch square drive impact tools and 3/8 inch drive impact sockets. Compatible with SHOCKWAVE Impact Duty socket sets and other standard impact-rated drive accessories.

Installation Notes

This adapter is intended for impact-rated use only and should not be substituted with standard chrome adapters in impact driver or impact wrench applications. Inspect the ring groove and retention holes before use to confirm the socket locks securely. Always verify drive size compatibility between the tool, adapter, and socket before applying torque to avoid tool damage or fastener slip.

Technical Specifications

• Drive Size (Input): 1/4 inch
• Output Drive Size: 3/8 inch
• Shank Style: Square
• Application Type: Impact
• Material: Forged Steel
• Color Finish: Black
• Magnetized: Yes
• Depth: 0.96 inches
• Country of Origin: China

Standard Information

• Brand: MILWAUKEE
• Manufacturer Part Number: 49-66-6720