Hex Key Wrench Wera 950 SPKL HF 4 mm – L-shaped hex key, 4 mm

Wera 950 SPKL HF 4 mm is an L-shaped hex key designed for precise tightening and loosening of 4 mm hex screws and bolts. The compact, one-piece construction combines a short arm for high torque and a long arm for reach, allowing users to work in confined spaces while maintaining control. Manufactured by Wera, this hex key is intended for workshop, maintenance and assembly tasks where reliable fit, repeatable performance and compact storage are required.

Advantages

The hardened and precision-ground tip ensures secure engagement with hex fasteners and reduces the risk of cam-out or rounding. The L-shape provides a balance between leverage and accessibility: the long arm offers reach into recessed fasteners while the short arm allows greater torque application. Corrosion-resistant finish increases service life and keeps the tool usable in typical workshop environments. Its compact size and durable construction make it easy to store in tool rolls, sets or pockets for everyday use.

Suitable for

• Assembly and maintenance of machinery and equipment
• Tightening and loosening hex bolts in tight or recessed areas
• Routine workshop and service tasks
• Electrical and mechanical installations where a 4 mm hex is required

Key specifications

• Shape: L-shaped (short arm and long arm)
• Size: 4 mm hex key across flats
• Material/hardening: hardened steel with precision-ground tip
• Finish: corrosion-resistant surface treatment
• Function: manual torque application for hex screws and bolts

How to use

Select the 4 mm end and insert it fully into the hex socket of the fastener to ensure maximum contact. Use the short arm for higher torque by holding the short end and turning the long arm, or use the long arm for reach and clearance when accessing deep or recessed fasteners. Apply steady, controlled force to avoid slipping; if greater leverage is needed, position the tool so the short arm is used as the handle and the long arm engages the fastener. After use, wipe the tool clean and store it in a suitable holder to maintain tip condition.

Usage recommendations

Do not use the hex key as a pry bar or hammer. Inspect the tip before use and replace the tool if the tip shows signs of rounding or excessive wear. For critical torque applications, use an appropriate torque-limiting tool or follow manufacturer torque specifications for the fasteners.