Milwaukee Tool 42-04-9112 Socket Adapter 1/4 to 3/8

Product Description

The MILWAUKEE TOOL 42-04-9112 is a socket adapter designed to reduce drive size from a 3/8 inch female square drive to a 1/4 inch male square drive. At 1 inch in overall length, this compact adapter allows a technician to use 1/4 inch drive sockets with a 3/8 inch drive ratchet or torque wrench. It is constructed from 31CrV3 chromium-vanadium steel with a chrome finish, providing durability under the repeated stress of hand-tool use. Electricians, HVAC technicians, plumbers, and general mechanical tradespeople keep this type of adapter in their socket sets for tight-clearance work where switching drive sizes is necessary.

This adapter is suited for residential and light commercial service work where a technician has a 3/8 inch drive ratchet on hand but needs to run 1/4 inch drive sockets. Common applications include panel work, equipment service, and component replacement tasks that require smaller fastener access. Its short 1 inch body keeps the overall tool stack height low, making it useful in confined spaces typical of HVAC cabinets, electrical enclosures, and plumbing access points.

Key Features

• Reduces 3/8 inch female square drive to 1/4 inch male square drive
• 31CrV3 chromium-vanadium steel construction for impact and wear resistance
• Chrome finish for corrosion protection
• 1 inch overall length minimizes added stack height in tight spaces
• Square drive on both ends for positive ratchet and socket engagement

Compatibility

Designed as a standard drive reducer compatible with any 3/8 inch square drive ratchet, torque wrench, or extension, and accepts any 1/4 inch square drive socket.

Installation Notes

This adapter is a hand-tool accessory installed by any trade professional using 3/8 inch drive ratchets. Ensure the adapter is fully seated in both the drive tool and the socket before applying torque. Do not use this adapter with impact drivers or impact wrenches, as it is rated for hand-tool use only. Inspect for wear or deformation before each use and replace if the square drive shows rounding.