Screwdriver Bit Wera 851/1 BDC SB

The Wera 851/1 BDC SB screwdriver bit is a compact 25 mm replacement bit with a 1/4" hexagonal shank designed for compatibility with standard bit holders and quick-change chucks. It is manufactured by Wera and intended for precision fastening tasks where a short, sturdy bit is required. The bit supports multiple drive geometries including small Hex (1.5 mm), Phillips and Torx Plus profiles, offering versatility in a single item for routine maintenance, assembly and repair work.

Advantages

This 25 mm bit combines a standardized 1/4" hex shank with hardened tip geometry to ensure reliable engagement with fasteners and reduced cam-out. Its short length improves access in confined spaces and provides better control during delicate operations. The multi-profile compatibility reduces the number of separate bits needed, saving storage space and simplifying tool selection.

Suitable for

• Precision electronics and small appliance repair
• Furniture assembly and maintenance
• Automotive trim and interior fastening
• General household DIY and maintenance tasks

Key specifications

• Shank type: 1/4" hexagonal
• Overall bit length: 25 mm
• Drive profiles: Hex 1.5 mm, Phillips, Torx Plus
• Material/hardening: hardened steel tip for wear resistance
• Compatibility: designed for standard 1/4" bit holders and quick-change systems

How to use

Insert the 1/4" hex shank of the Wera 851/1 BDC SB into a compatible bit holder, manual screwdriver handle or power tool adapter. Select the appropriate drive profile to match the screw head, ensure the bit seats fully in the fastener, and apply steady axial pressure while turning. For power tools, use low to moderate speed and controlled torque to avoid damaging small screws or the bit tip. After use, store the bit in a holder or bit case to protect the tip from wear.

Usage recommendations

Use the bit only with matching screw head types and avoid excessive torque beyond the screw or tool rating. Regularly inspect the tip for wear and replace when rounded or damaged to maintain secure engagement and prevent fastener damage.