Extensions and Adapters
Wrenches and Sockets
Extensions and adapters link the drive tool to the socket wherever the fastener sits recessed, hidden or at an angle. Extension bars bridge the distance to the screw, universal joints compensate angular offset, and reducing or increasing adapters convert between the square drive sizes to DIN 3120 and ISO 1174. Selection follows drive size, overall length, permissible torque and whether a ball detent has to retain the socket. The range holds 194 items, mainly from Wera, Wiha, Bahco, Proxxon and Knipex.
| Component | Drive | Length or conversion | Purpose |
|---|---|---|---|
| Extension bar | 1/4 inch | 50, 100, 150 mm | fine assembly inside deep housings |
| Extension bar | 3/8 inch | 75, 150, 200 mm | medium torque at a distance from the screw |
| Extension bar | 1/2 inch | 64, 125, 250 mm | machine and plant assembly |
| Universal joint | 1/4, 3/8, 1/2 inch | angular offset | fasteners approached at an angle |
| Reducing adapter | square to square | 1/2 to 3/8, 3/8 to 1/4 inch | using sockets of another drive size |
| Bit adapter | female square to hexagon | DIN 3126, 6.3 mm | bits on a ratchet or torque wrench |
Typical applications: recessed fasteners in housings and machine frames; screw positions behind covers and cable harnesses; angled flange bolts tightened through a universal joint; reusing existing sockets on a different drive size; bit driving with a torque wrench; powered pre-tightening with a drill adapter.
