Socket insert 8 mm 1/4" Wera 8790 HMA — 8 mm drive for 1/4" tool interface

Wera Socket Insert 8 mm 1/4" (model 8790 HMA) is a compact, precisely machined socket designed for use with 1/4" drive tools. The insert provides an 8 mm opening for fastening and loosening hex nuts and bolts in confined or hard-to-reach areas. Manufactured to fit standard 1/4" tool interfaces, the insert is compatible with hand ratchets, interchangeable bit handles and torque drivers that accept 1/4" socket inserts, delivering a reliable mechanical connection and consistent torque transfer.

Advantages

The socket insert offers a precise internal geometry that ensures secure engagement with 8 mm fasteners and minimizes rounding. Its compact length and slim profile allow access in tight spaces where longer sockets would not fit. Made from heat-treated steel with a corrosion-resistant finish, the insert balances durability and smooth operation for repeated workshop and maintenance use. The standardized 1/4" drive interface simplifies swapping between tools and accessories.

Suitable for

• Assembly and disassembly of small machinery and equipment
• Maintenance tasks in confined spaces, such as automotive and bicycle repairs
• Precision fastening with torque drivers and hand ratchets
• Use with interchangeable bit handles and compact tool kits

Key specifications

• Socket size: 8 mm
• Drive interface: 1/4" (6.35 mm) female drive
• Compatibility: designed for use with 1/4" hand ratchets, torque drivers and interchangeable bit handles
• Material: heat-treated steel with corrosion-resistant finish
• Profile: hexagonal internal profile for hex fasteners
• Length: compact / short profile suitable for tight spaces

How to use

Insert the socket into a compatible 1/4" drive tool until it seats securely. Place the 8 mm opening over the fastener head and apply steady turning force with a hand ratchet, torque driver or interchangeable handle. For torque-critical applications, use a calibrated torque driver and set the required torque value before applying force. When removing the socket, pull it straight out of the drive to avoid damaging the retaining mechanism.

Usage recommendations

Inspect the socket and fastener for damage or excessive wear before use. Use the insert within the torque limits of the connected tool and avoid impact tools unless the insert is specifically rated for such use. Store the socket in a clean, dry tool organizer to maintain the corrosion-resistant finish and ensure reliable fit.