Screwdriver Bit Wiha 285992

The Wiha 285992 screwdriver bit is a specialist nut driver designed to increase fastening efficiency. Made by Wiha, this tool combines a hardened chrome-vanadium-molybdenum blade with a nickel-plated head and a spring-mounted ball to ensure secure engagement and controlled fastening with pre-set torque.

Advantages

The blade is manufactured from high-quality chrome-vanadium-molybdenum steel that is through-hardened and chrome-plated for wear resistance. The nickel-plated head includes a spring-mounted ball that provides reliable retention of nuts and fasteners. The bit’s 155 mm length and 22 g weight offer easy handling and improved access in tight spaces while maintaining durability for repeated professional or DIY use.

Suitable for

• Controlled fastening tasks requiring a nut driver or socket-style bit
• Precision assembly and maintenance work
• Professional trades and DIY projects where a 4 mm metric profile is needed

Key specifications

• Manufacturer: Wiha
• Model / code: 285992 (MPN 26229)
• Type: Screwdriver bit — nut driver style
• Tip sizes: square and hex profile, metric 4 mm
• Blade material: chrome-vanadium-molybdenum steel, through-hardened, chrome-plated
• Head: nickel-plated with spring-mounted ball
• Length: 155 mm
• Weight: 22 g
• EAN: 4010995262297

How to use

Insert the Wiha 285992 bit into a compatible driver or holder. Engage the spring-mounted ball end with the nut or fastener so the bit retains the part securely. Apply the required torque slowly and steadily; the tool is intended for controlled fastening and works with pre-set torque settings on torque drivers. After use, clean the bit and store it in a dry place to prevent corrosion.

Usage recommendations

Use the bit with drivers or holders that match its 155 mm length and 4 mm profile. Avoid exceeding the torque recommended for the fastener or driver to prevent damage to the bit or fastener. Regularly inspect the blade and head for wear and replace if deformation or rounding of the tip is observed.