Nut driver bit Wera 8790 HMA — hexagonal shank 1/4" (25.4/4 mm), length 50 mm, 1 pc

Wera 8790 HMA deep nut driver bit with a hexagonal 1/4" (25.4/4 mm) shank and a 50 mm overall length is designed to reach recessed nut heads and deliver reliable torque transfer when used with powered drivers or bit holders. This single-piece bit offers a compact profile for confined spaces while maintaining accurate engagement with fasteners common in mechanical, electrical and maintenance applications.

Advantages

The Wera 8790 HMA nut driver bit provides solid fit and reduced cam‑out thanks to precise hex geometry and a hardened tip. Its 50 mm length allows access to nuts located in deeper bores or behind obstacles without sacrificing control. The standardized 1/4" hex shank ensures compatibility with most impact drivers, cordless screwdrivers and interchangeable bit holders used in professional and DIY settings.

Suitable for

• Reaching recessed or hard-to-access hex nuts in machinery and equipment
• Electrical panel assembly and service work where space is limited
• Routine maintenance and repair tasks on automotive and industrial components
• Use with powered drivers, bit holders and quick-change chucks

Key specifications

• Shank type: hexagonal 1/4" (25.4/4 mm)
• Overall length: 50 mm
• Item form: single-piece deep nut driver bit
• Compatibility: fits standard 1/4" bit holders and driver chucks
• Application: designed for hex nut engagement and torque transfer

How to use

Insert the 1/4" hex shank into a compatible driver, bit holder or quick‑change chuck and ensure it seats fully to prevent slippage. Position the nut driver bit onto the nut head, then apply steady torque using the power tool or manual holder. For best results, maintain axial pressure while turning to keep the bit fully engaged with the fastener and avoid side loading that can damage both bit and nut.

Usage recommendations

Use the Wera 8790 HMA bit with tools rated for the intended torque and avoid excessive impact force on small or damaged fasteners. Inspect the bit tip regularly for wear and replace it when signs of rounding or deformation appear to preserve safe and reliable operation.