Screwdriver Bit Wera 840/4 IMP DC Hex-Plus DIY

The Wera 840/4 IMP DC Hex-Plus DIY screwdriver bit is a premium replacement bit designed for hexagonal socket screws. It features a 5 mm Hex-Plus tip, a 50 mm working length and a 1/4" hexagonal shank compatible with holders to DIN ISO 1173-F 6.3. Manufactured in the Czech Republic, the bit uses Impaktor technology and a rough diamond-particle coating on the tip to increase service life and reduce slippage under high torque.

Advantages

Impaktor technology provides increased durability under impact and high-load conditions. The diamond-particle coating on the tip raises friction resistance to minimize cam-out. Hex-Plus geometry increases contact surface in the screw head, reducing notch effect and greatly lowering the risk of screw damage. The 1/4" hex shank ensures compatibility with standard bit holders.

Suitable for

• DIY assembly and repair work
• High-torque fastening with impact drivers
• Applications requiring reduced screw head wear
• Use with 1/4" bit holders meeting DIN ISO 1173-F 6.3

Key specifications

• Brand: Wera
• Model: 840/4 IMP DC Hex-Plus DIY
• Tip type: Hex-Plus 5 mm
• Length: 50 mm
• Shank: 1/4" hex (DIN ISO 1173-F 6.3)
• Technology: Impaktor with diamond-particle coating
• Manufacturer part number (MPN): 05 057645 001
• EAN: 2050001223777
• Country of manufacture: Czech Republic

How to use

Insert the 1/4" hex shank into a compatible bit holder or impact driver. Engage the 5 mm Hex-Plus tip with the hexagonal screw head, apply steady axial pressure and operate the driver at an appropriate torque or impact setting. For optimal engagement, ensure the bit tip fully seats in the screw recess before applying torque. After use, store the bit in a suitable holder to protect the coated tip.

Usage recommendations

Use this bit for tasks that require higher resistance to cam-out and impact loads. Avoid using a damaged or excessively worn tip; replace the bit when wear impairs secure engagement. Match torque and impact settings of power tools to the screw and material to prevent over-stressing the fastener.