Ruuvinväänninbitsi Wera 855/1 BDC PZ

The Wera 855/1 BDC PZ screwdriver bit is a 25 mm Pozidriv (PZ 1) tip bit with a 1/4" hex shank, made in the Czech Republic. The tip is coated with fine diamond particles to improve grip in Pozidriv screws, reduce required contact pressure and decrease the risk of cam-out. The bit includes a Torsion zone and a softer BiTorsion zone that divert kinetic energy from peak loads and prevent tip distortion, extending service life and ensuring reliable fastening performance.

Advantages

Diamond-particle tip for improved adherence to Pozidriv screw heads, reduced slipping and lower contact pressure; integrated Torsion and BiTorsion zones that absorb peak loads to prevent tip twisting and increase durability; standard 1/4" hex shank compatible with holders to DIN ISO 1173-D 6.3; compact 25 mm length for work in confined spaces.

Suitable for

• Assembly and maintenance tasks using Pozidriv PZ 1 screws
• Work in tight or recessed areas where a short 25 mm bit is needed
• Use with 1/4" bit holders, quick-change chucks and screwdriver adapters
• Applications requiring reduced cam-out and longer bit life

Key specifications

• Type: Pozidriv (PZ 1) screwdriver bit
• Length: 25 mm
• Shank: 1/4" hex (DIN ISO 1173-D 6.3 compatible)
• Special features: diamond-particle tip, Torsion zone, BiTorsion zone
• Brand: Wera
• MPN: 05 056700 001
• EAN: 2050001423542
• Country of manufacture: Czech Republic

How to use

Insert the 1/4" hex shank into a compatible holder, chuck or screwdriver adapter. Engage the Pozidriv PZ 1 tip with the screw head and apply steady axial pressure while turning at a controlled speed. The diamond-particle tip reduces slipping; when encountering high loads, the Torsion and BiTorsion zones will absorb peak torque to protect the tip. Inspect the bit periodically for wear and replace if the tip profile is visibly rounded or damaged.

Recommendations

Use the bit with the correct Pozidriv (PZ) screw profile and size to maximize contact and minimize wear. Avoid excessive lateral force and use the shorter 25 mm length for confined access; for high-torque applications consider using longer or reinforced bits designed for impact drivers.