Screwdriver bit Wera 851/4 J PH 0 50 mm, 1/4" hex shank

Wera 851/4 J PH 0 50 mm is a single Phillips screwdriver bit designed for precise engagement with Phillips fasteners. The bit has a PH 0 tip and a 50 mm working length with a 1/4" hexagonal shank, making it compatible with standard 1/4" bit holders and bit chucks used in hand and power drivers. It is optimised for Asian and Japanese Phillips screw dimensions and intended for general assembly, repair and maintenance tasks that require a small, accurate Phillips driver tip.

Advantages

The bit combines ductility and toughness to perform reliably with harder materials and under repeated use. Its geometry is optimised for Japanese Phillips screws, improving contact and reducing cam‑out on very small fasteners. The 1/4" hex shank ensures secure insertion into DIN ISO 1173-F 6.3 compatible holders and common 1/4" chucks, enabling fast interchange between manual and powered drivers. A single‑piece design simplifies storage and use for focused tasks.

Suitable for

• Precision assembly and small electronics repair where PH 0 Phillips screws are used
• Work on devices manufactured to Japanese camera industry screw standards
• General maintenance tasks requiring a 50 mm Phillips bit with 1/4" hex shank
• Use with 1/4" bit holders and power drivers that accept hex bits

Key specifications

• Tip type: Phillips PH 0
• Working length: 50 mm
• Shank type: 1/4" (6.35 mm) hexagonal shank
• Material properties: ductile and tough for use with harder materials
• Optimisation: for Asian / Japanese Phillips screw dimensions
• Compatibility: fits holders conforming to DIN ISO 1173-F 6.3 and common 1/4" chucks
• Quantity: 1 piece

How to use

Insert the 1/4" hex shank into a compatible bit holder or directly into a 1/4" bit chuck on a manual or powered driver. Align the PH 0 tip with the cross recess of the screw, apply steady axial pressure and turn the driver. For powered driving, use controlled speed and torque settings appropriate for small Phillips screws to avoid stripping. After use, store the bit in a bit holder or case to protect the tip geometry.

Usage recommendations

Use low to moderate torque when driving small Phillips screws and ensure the bit tip is fully seated in the screw recess before applying power. For repeatable accuracy with very small fasteners, inspect the tip for wear and replace the bit if deformation or rounding is visible.