Wera 851 BTH Bit (Philips Head)

Wera 851 BTH Phillips Bit

The hardest part of a screwdriving job can happen in an instant: the sudden force when a power tool starts or the screw comes to a stop. The Wera 851/1 BTH uses a BiTorsion zone to help absorb those peak loads, reducing stress on the bit during repeated driving.

It’s a particularly hard bit suited to fastening in semi-hard materials. Pair it with a compatible Wera BiTorsion holder for the full two-stage cushioning system: the holder responds to lighter loads, while the bit’s torsion zone helps manage higher ones. The bit can also be used in a compatible standard holder.

Key Features

• BiTorsion zone: Helps absorb sudden torque loads and reduce premature wear.
• Particularly hard design: Suited to screwdriving in semi-hard materials.
• Holder flexibility: Works with a compatible standard holder; pair with a BiTorsion holder for two-stage cushioning.
• Take it easy tool finder: Color coding by drive profile and a size marking help you find the right bit quickly.
• 1/4-inch hex drive: Wera connecting series 1 for compatible holders and drivers.

A hardworking bit for the starts, stops, and repeated turns of the job.