Screwdriver bit Wera 855/4 Z SB — Torx 1, 89 mm, 1/4" shank

The Wera 855/4 Z SB screwdriver bit is a single Torx bit designed for precision fastening. With a Torx tip size 1 and a total length of 89 mm, this bit offers an extended reach while maintaining control in tight assemblies. The 1/4" shank is compatible with standard bit holders and power drivers, allowing straightforward integration into hand tools and cordless screwdrivers. Supplied as one piece, this bit is intended for tasks that require a compact Torx 1 tip and reliable engagement.

Advantages

The bit combines a precisely formed Torx 1 tip for accurate engagement with fasteners and a longer 89 mm length to access recessed or deep-set screws. The standardized 1/4" shank ensures broad compatibility with bit holders, magnetic adapters, and quick-release chucks. Manufactured to professional tolerances, the bit provides consistent fit, reduced cam-out and dependable torque transfer suitable for assembly, repair and maintenance work.

Suitable for

• Electronics assembly and repair where compact Torx 1 fasteners are used
• Furniture and appliance maintenance requiring extended reach
• Precision mechanical assembly in workshops and production lines
• Use with manual bit holders, ratchet adapters and cordless drivers

Key specifications

• Tip profile: Torx size 1
• Total length: 89 mm
• Shank diameter: 1/4" (standard bit shank)
• Compatibility: fits 1/4" bit holders and power drivers
• Packaging: single piece

How to use

Insert the 1/4" shank into a compatible bit holder, quick-release chuck or the screwdriver’s bit receptacle until it seats securely. Align the Torx 1 tip with the corresponding fastener head and apply steady axial pressure while turning the driver to avoid slippage. For power drivers, select an appropriate torque setting to prevent over-tightening small Torx fasteners. After use, store the bit in a protective case or bit organizer to protect the tip geometry.

Usage recommendations

Use the bit with properly sized Torx 1 fasteners and avoid excessive side load to preserve tip shape. When using powered tools, set torque limits appropriate for small fasteners to reduce the risk of damage to the fastener or workpiece.