Milwaukee Tool 42-04-9110 Socket Adapter 3/8 to 1/4 Drive

Product Description

The MILWAUKEE TOOL 42-04-9110 is a socket adapter designed to convert a 1/4 inch square drive ratchet or tool to accept 3/8 inch square drive sockets. Machined from 31CrV3 chromium-vanadium steel with a chrome finish, this adapter delivers the durability needed for repeated use in professional service environments. At 1 inch overall length, it keeps the tool profile compact. HVAC technicians, plumbers, electricians, and mechanical contractors use drive adapters like this when switching between socket sets on the same ratchet handle, reducing the need to carry multiple ratchets on the job.

This adapter is suited for use with hand ratchets in tight service bays, equipment rooms, and panel enclosures where space is limited. It steps up from a 1/4 inch female drive to a 3/8 inch male drive, allowing a technician to run larger 3/8 inch sockets off a smaller 1/4 inch ratchet. Typical applications include equipment fastener service on HVAC units, electrical panels, and plumbing fixture installations where varying fastener sizes require drive size flexibility.

Key Features

• Converts 1/4 inch female square drive to 3/8 inch male square drive
• Machined from 31CrV3 chromium-vanadium steel for high-torque durability
• Chrome finish resists corrosion in wet or humid service environments
• Compact 1 inch overall length minimizes added tool stack height
• Sold individually — integrates directly with standard hand ratchet sets

Compatibility

Designed to increase drive size on a hand ratchet from 1/4 inch to 3/8 inch. Compatible with any standard 1/4 inch square drive ratchet and any standard 3/8 inch square drive socket.

Installation Notes

No installation required — this adapter is a hand-tool accessory. Ensure both the ratchet drive and socket are fully seated on the adapter before applying torque. Do not use this adapter with impact drivers or pneumatic tools, as the adapter is rated for hand-ratchet use only. Inspect the adapter for wear or cracking before each use and replace if deformation is visible.