Wera Bit 851/1 Z Phillips PH3 x 25 mm magnetic screwdriver bit, model 05072074001

Wera Bit 851/1 Z Phillips PH3 x 25 mm is a screwdriver bit manufactured for use with bit holders and compatible power tools. The PH3 tip is designed for larger Phillips screws encountered in woodworking, construction and mechanical work. With a 25 mm working length and magnetic tip, the bit provides secure engagement with fasteners and improved control when driving or removing Phillips screws. The bit is part of Wera's range of screwdriver bits engineered for repeatable fit and durability under normal workshop and on-site conditions.

Advantages

The bit's PH3 geometry ensures consistent contact with Phillips recesses, reducing cam-out risk when correct torque and tool are used. A 25 mm length offers a balance between reach and control for common applications. The magnetic tip holds screws in place on the bit, facilitating single-handed positioning and reducing the chance of dropped fasteners. Manufactured to Wera quality standards, the bit is intended to provide reliable performance with standard bit holders and quick-change chucks.

Suitable for

• Driving and removing PH3 Phillips screws in wood and composite materials
• Mechanical assembly and disassembly where PH3 fasteners are specified
• Construction tasks requiring a PH3 bit with moderate reach
• Use with bit holders, hand drivers and compatible cordless or corded screwdrivers

Key specifications

• Tip type: Phillips PH3
• Working length: 25 mm
• Magnetic tip for screw retention
• Compatibility: standard 1/4" hex drive bit holders and quick-change chucks
• Material and finish: hardened steel with wear-resistant surface treatment

How to use

Insert the Wera PH3 x 25 mm bit into a compatible 1/4" hex bit holder or quick-change chuck until it locks. Position the screw head on the magnetic tip to hold it in place, align the bit with the screw recess, and apply steady axial pressure while driving with a manual driver or power tool. Use appropriate torque settings on cordless drivers to avoid stripping the screw head. For removal, reverse the rotation while maintaining alignment and steady pressure.

Usage recommendations

Use the bit with the correct PH3 screw size and a suitable tool to minimize wear; avoid excessive torque and side loading. Inspect the tip regularly and replace the bit if the tip shows rounding or damage to ensure continued accurate engagement and safety.