Hex key Proline 8 mm, model 48491 — single metric Allen wrench

Proline hex key model 48491 is a single 8 mm metric Allen wrench designed for driving and loosening hex socket fasteners. Made from quenched and tempered steel with a polished chromium finish, this 8 mm hex key offers a compact profile and a rigid shaft suited for general maintenance, assembly and repair tasks on furniture, bicycles and a range of machinery that use 8 mm hex bolts. Supplied as a single piece, it can be used independently for targeted work or to complement a larger tool set.

Advantages

The hardened construction achieved by quenching and tempering increases torsional strength and reduces the risk of bending or rounding under load. The polished chromium finish provides corrosion resistance and a smooth surface that is easy to clean. Its single-piece format delivers straightforward handling and storage, while the metric 8 mm size ensures compatibility with standard metric hex fasteners used in many consumer and industrial applications.

Suitable for

• Assembling and disassembling furniture with 8 mm hex fasteners
• Bicycle maintenance where 8 mm Allen bolts are used
• Light machinery adjustments and equipment repairs
• Home DIY projects requiring a reliable metric Allen key

Key specifications

• Tool type: single metric hex key (Allen wrench)
• Size: 8 mm (hexagonal drive)
• Material: quenched and tempered steel
• Surface finish: polished chromium
• Format: single-piece L-shaped key for manual use

How to use

Insert the 8 mm hex tip fully into the hex socket of the fastener to ensure full engagement. Apply steady, controlled torque using the longer arm for greater leverage or the shorter arm for higher torque in confined spaces. Avoid excessive force that could damage the fastener head; if a fastener is seized, apply penetrating lubricant and allow it to work before attempting to turn. After use, wipe the tool clean to remove debris and store it in a dry place to maintain the polished chromium finish.

Usage recommendations

For best results, match the 8 mm hex key precisely to the fastener size and avoid using worn or rounded keys. Use appropriate personal protection if working on machinery or bicycles, and check fastener torque requirements for critical applications to prevent over-tightening.