Wera 391 llave de vaso 8 mm x 167 mm 05028152001

For electricians and maintenance technicians working on terminal blocks, control cabinets, and machinery, the Wera 391 nut driver provides a secure hold on hex head screws and nuts. Its 8 mm socket and 167 mm blade reach recessed fasteners, while the hollow shaft accommodates protruding threaded rods.

Key specifications

• Drive size: 8 mm hex socket
• Blade length: 167 mm
• Overall length: 274 mm
• Handle: Kraftform multi-component with anti-roll and fast-turning zone
• Shaft: round hollow, high alloy special steel
• Holding function: mechanical (non-magnetic) for nuts and bolts

Why choose it

The Wera 391 combines a precision-machined socket with a comfortable, ergonomic handle. The hollow shaft allows use on long threaded rods, and the holding function prevents fasteners from falling during positioning. The anti-roll handle keeps the tool in place on sloped surfaces.

Ideal use cases

• Fastening hex head screws and nuts in electrical panels
• Working on protruding threaded rods where a hollow shaft is required
• Manual assembly and maintenance tasks in industrial and workshop settings

Good to know

The tool is part of the Wera 391 series and is designed for manual use. It is not magnetic; the holding function is mechanical, providing reliable retention without magnetic interference.