Hex key Proline 4 mm – Proline 48463 single hex key, metric 4 mm

Proline 4 mm hex key model 48463 is a single-piece, metric Allen key designed for driving 4 mm hex-head fasteners. Quenched and tempered for strength and finished with polished chromium plating, this compact hand tool offers a precise fit and reliable torque transfer for common assembly, maintenance and repair tasks in furniture, bicycles, electronics and general DIY applications.

Advantages

The hardened steel construction ensures resistance to bending and wear, while the polished chromium surface improves corrosion resistance and simplifies cleaning after use. Its single-piece design provides consistent geometry for accurate engagement with hex bolts, reducing the risk of rounding fastener heads. The compact shape makes it convenient to carry in a pocket or toolbox and to reach into confined spaces.

Suitable for

• Assembly and adjustment of furniture
• Bicycle maintenance and component fitting
• Electronics and small appliance servicing
• General DIY repairs and hobby projects

Key specifications

• Working size: 4 mm (metric)
• Material treatment: quenched and tempered steel
• Surface finish: polished chromium plating
• Design: single-piece straight hex key
• Typical use: manual hand tool for hex-head fasteners

How to use

Select the 4 mm hex key for fasteners with a matching internal hex profile. Insert the short or long arm of the key into the bolt head as required for access and leverage, ensuring full engagement before applying torque. Turn clockwise to tighten and counterclockwise to loosen. Apply steady, controlled force to avoid stripping the fastener; if higher torque is needed, use the longer arm for increased leverage or an appropriate tool designed for higher torque.

Usage recommendations

Store the hex key in a dry toolbox to maintain the chromium finish and prevent corrosion. Inspect the hex profile regularly for wear and avoid using the key on damaged or rounded fasteners. For tasks requiring precision torque settings, use a torque-limiting device or a calibrated torque wrench with appropriate adapters.