Nut Driver Bit Wera 8790 HMC

The Wera 8790 HMC nut driver bit is a compact hexagonal bit designed for secure tightening and loosening of hex screws. With a shank size of 25.4 / 2 mm (1/2") and a working length of 40 mm, this bit is intended for use with compatible holders and power tools where a reliable fit and precise torque transfer are required. Weighing 64 g, it offers a balance of robustness and portability for technicians and professionals performing maintenance, assembly or repair tasks.

Advantages

The nut driver bit provides a precise hex fit that minimizes cam-out and wear on fasteners. Its 40 mm length gives good access in confined spaces while maintaining control and stability. Manufactured to Wera's standards, the bit combines a durable material finish with a compact form factor that suits both handheld and machine-assisted driving.

Suitable for

• Tightening and loosening hexagonal screws in mechanical assembly
• Maintenance and repair work in electronics, automotive and industrial equipment
• Use with 1/2" compatible holders, adapters and power tool chucks
• Precision tasks that require a compact bit with reliable engagement

Key specifications

• Bit type: Hex (nut driver)
• Shank size: 25.4 / 2 mm (1/2")
• Working length: 40 mm
• Weight: 64 g
• Material and finish: hardened driving profile with wear-resistant surface (manufacturer standard)

How to use

Insert the 1/2" shank into a compatible holder, socket adapter or power tool chuck and ensure it is seated securely. Position the hex profile onto the fastener and apply steady torque, keeping the driver aligned with the screw axis to avoid slipping. For machine use, select appropriate speed and torque settings to match the fastener and application. After use, clean any debris and store the bit in a holder or toolbox to protect the driving profile.

Usage recommendations

Use the bit with holders and tools rated for 1/2" shanks and avoid applying excessive torque beyond the fastener or tool specification. Inspect the hex profile regularly for signs of wear and replace the bit when rounding or damage is observed to maintain secure engagement and prevent damage to fasteners.