Wera 855/1 BDC PZ ruuvauskärki

The Wera 855/1 BDC PZ screwdriver bit is a Pozidriv (PZ 3) bit with a 25 mm working length and a 1/4" hexagonal shank, manufactured in the Czech Republic. The bit tip is coated with tiny diamond particles to improve grip in the screw recess, reduce required contact pressure and lower the risk of slipping during fastening. The bit includes a Torsion zone that diverts kinetic energy away from peak loads and an additional softer BiTorsion zone to prevent the tip from twisting under sudden stress, extending the service life.

Advantages

The diamond-particle tip provides improved fit and reduces cam-out, while the Torsion and BiTorsion zones absorb peak loads to protect the bit and screw. The 1/4" hex shank is compatible with standard holders specified by DIN ISO 1173-D 6.3. The compact 25 mm length is suitable for use in confined spaces and for precise fastening work.

Suitable for

• General fastening with Pozidriv PZ 3 screws
• Work in tight or confined spaces
• Use with 1/4" hex holders and bit sockets (DIN ISO 1173-D 6.3)
• Applications requiring reduced cam-out and longer bit life

Key specifications

• Type: Pozidriv bit, PZ 3
• Length: 25 mm (working length)
• Shank: 1/4" hexagon (DIN ISO 1173-D 6.3)
• Special features: diamond-particle tip, Torsion zone, BiTorsion zone
• Manufacturer: Wera
• Made in: Czech Republic
• MPN: 05 056704 001
• EAN: 2050000315626

How to use

Insert the 1/4" hex shank into a compatible bit holder or screwdriver, ensuring it seats fully. Select Pozidriv PZ 3 screws for correct engagement with the diamond-particle tip. Apply steady axial pressure while driving to benefit from reduced cam-out; the Torsion and BiTorsion zones will absorb peak loads during demanding turns. After use, store the bit in a dedicated holder or case to protect the tip coating.

Recommendations

Use the bit with matching Pozidriv PZ 3 screws and appropriate torque settings. Avoid side-loading and excessive bending; replace the bit if the tip shows visible wear to maintain secure engagement and prevent damage to screw heads.