Hex key set Jonnesway S29H4140S, CR-V steel, 40 pieces

Jonnesway S29H4140S is a 40-piece hex key set manufactured from chrome-vanadium (CR-V) steel and supplied in a compact organizer. The set covers a broad range of internal hex (Allen) sizes for workshop, automotive and household repair tasks. Each key is shaped for reliable torque transfer and corrosion resistance to meet frequent use in assembly, maintenance and mechanical servicing.

Advantages

The CR-V steel construction offers high strength and wear resistance while maintaining accurate hex geometry for secure screw engagement. The compact organizer keeps keys sorted and accessible, reducing search time and minimizing tool loss. Designed for balanced stiffness and slight flexibility where needed, the set supports controlled torque application without premature deformation.

Suitable for

• Automotive repair and component assembly
• Workshop maintenance and machine servicing
• Furniture and equipment assembly at home or on site
• Electronics enclosures and mechanical fastening tasks

Key specifications

• Material: Chromium-vanadium (CR-V) steel for durability and corrosion resistance
• Number of pieces: 40 internal hex keys
• Storage: Compact organizer for secure storage and transport
• Finish: Protective surface treatment to reduce oxidation
• Design: Standard L-shape hex keys for leverage and reach

How to use

Select the hex key that matches the internal hex socket of the fastener so the flat faces engage fully. Insert the short end for maximum reach or the long end for increased leverage depending on needed torque and clearance. Apply steady, even pressure when tightening or loosening to avoid rounding the fastener. Store keys in the organizer after use to maintain order and protect the tool surfaces.

Usage recommendations

For safe and long-lasting performance, clean keys and fastener sockets before use, avoid excessive impact or hammering on the tools, and choose the correct key size to prevent damage to both tool and fastener. Periodically apply a light oil to the keys if they are used or stored in humid environments.