Torx Bit Wera T40 867/4 IMP DC SB – alloy steel, diamond coated

Wera Torx bit T40 867/4 IMP DC SB is an alloy steel replacement bit with a diamond-coated tip engineered for improved grip and extended wear resistance. Designed for use with impact drivers and power tools that accept Torx IMP fittings, this T40 bit provides reliable screw engagement, reduced cam‑out and consistent torque transfer for repetitive fastening tasks. The compact bit geometry and hardened alloy body deliver durability in professional and DIY environments.

Advantages

The diamond coating on the working tip increases friction between the bit and the screw head, improving grip and reducing the risk of slippage under high torque. Constructed from alloy steel and heat-treated for strength, the bit resists deformation and premature wear during impact applications. Its IMP profile is optimized for modern impact drivers, ensuring secure seating in Torx fasteners and consistent engagement over many cycles. The compact design helps access recessed or partially obstructed screw heads.

Suitable for

• Assembly of machinery and equipment with Torx T40 fasteners
• Maintenance and repair of automotive components and consumer electronics
• Construction and woodworking tasks requiring impact fastening
• Service and installation work where reduced cam‑out and high durability are required

Key specifications

• Bit type: Torx T40, IMP profile for impact drivers
• Material: alloy steel with heat-treated construction
• Tip finish: diamond-coated working surface for enhanced grip
• Intended use: compatible with impact drivers and power tools accepting Torx IMP bits
• Typical applications: high-torque fastening, repetitive assembly, maintenance tasks

How to use

Insert the Torx T40 bit into the chuck or quick-change holder of a power driver that supports IMP profile bits, ensuring the bit seats securely. Align the bit with the Torx screw head and apply steady pressure while operating the tool at an appropriate torque and speed for the fastener and material. For impact applications, allow the driver to deliver intermittent impacts rather than sustained high-speed rotation to reduce wear on both the bit and the screw. Inspect the tip periodically for signs of wear and replace the bit when the engagement quality diminishes.

Usage recommendations

Use the bit with compatible impact drivers and select torque settings appropriate to the screw size and substrate. Avoid using a worn or damaged bit to prevent screw head rounding. Store the bit in a clean, dry toolbox or bit holder to preserve the diamond coating and prevent corrosion. For improved lifespan, combine with fasteners in good condition and avoid side loading or levering during use.