Hex key Proline 48409, single 9 mm metric hex key

Proline 48409 is a single metric hex key with a 9 mm tip size designed for tightening and loosening hexagonal socket fasteners. Manufactured from quenched and tempered steel with a polished chromium finish, this 9 mm Allen key provides consistent contact with fastener heads and is suitable for general workshop, household and professional maintenance tasks where a single-size tool is required.

Advantages

The hardened and tempered steel construction ensures durability and resistance to wear during repeated use. The polished chromium finish improves corrosion resistance and allows smooth insertion into sockets while reducing surface marking. The single, straight hex-key form gives reliable torque transfer to hex fasteners and permits access in confined spaces where longer handles would be impractical.

Suitable for

• Tightening and loosening M9 metric hex socket bolts and screws
• Assembly and disassembly of furniture, machinery and equipment with 9 mm hex sockets
• Workshop repairs, vehicle maintenance and general household fixes requiring a 9 mm hex key

Key specifications

• Type: single metric hex key (Allen key)
• Tip size: 9 mm
• Material treatment: quenched and tempered steel
• Surface finish: polished chromium
• Form: straight, single-piece hex key

How to use

Select the 9 mm hex key and insert the tip fully into the hexagonal recess of the fastener to achieve full contact. Apply steady torque in the required direction to tighten or loosen the fastener, using the long axis of the key for leverage. For higher torque needs, use the shorter end as a stub or pair with appropriate handle aids; avoid applying excessive force that exceeds the tool’s intended use to prevent rounding of the fastener or damage to the key.

Usage recommendations

Keep the tool clean and dry after use to maintain the polished chromium finish and corrosion resistance. Inspect the tip before use for signs of wear or rounding; replace if deformed. Use the correct 9 mm size to ensure optimal engagement and minimize risk of fastener damage.