Screwdriver Bit Wera 851/1 BDC PH Alloy Tool Steel PH size (05056402001)

The Wera 851/1 BDC PH screwdriver bit is a replaceable PH-tip bit manufactured from alloy tool steel for cross-head screw driving. Designed for use with compatible bit holders and multi-bit drivers, this bit offers a precise fit in PH screws and consistent torque transfer during assembly, repair and maintenance tasks. Its geometry and material selection focus on wear resistance and repeatable engagement to reduce slipping and fastener damage.

Advantages

This screwdriver bit provides a durable PH tip with high dimensional accuracy and resistance to deformation under normal working loads. The alloy tool steel construction improves lifespan compared with standard carbon steels and maintains drive engagement over many cycles. The bit’s consistent tip geometry supports secure insertion and less cam-out, helping to protect screw heads and speed up routine fastening operations.

Suitable for

• Assembly lines and industrial production where PH screws are common
• Electronics and appliance repair that require precise cross-head driving
• Maintenance and service tasks in workshops, construction and automotive settings
• Use with bit holders, quick-change chucks and multi-bit screwdriver handles

Key specifications

• Tip type: PH (Phillips) cross-head
• Material: alloy tool steel for improved wear resistance
• Design: replaceable bit compatible with standard 1/4" hex bit holders
• Application: manual and powered screwdriving with appropriate drivers
• Durability: engineered for repeated engagement and reduced cam-out

How to use

Insert the bit into a compatible bit holder or multi-bit driver until it seats securely. Align the PH tip with the screw head and apply steady axial pressure while turning the driver or operating the power tool. For powered driving, use appropriate torque settings to avoid over-tightening. Replace the bit when signs of tip wear, rounding or poor engagement appear to maintain proper fastening quality.

Recommendations

Use the Wera 851/1 BDC PH bit with drivers rated for PH screws and matched to the screw size. Inspect the tip before use and avoid excessive torque or impact settings that exceed the bit’s intended manual or powered application. Store bits in a dry, organized holder to prevent damage and simplify tool selection.