Hex Key Set Bondhus BO12137 — 13-piece long inch hex keys, sizes 0.050" to 3/8"

Bondhus BO12137 is a 13-piece long inch hex key set offering sizes from 0.050" to 3/8". The long-leg design provides extra reach and leverage for working with recessed fasteners, deep-set hex sockets and components in confined spaces. Made for inch-threaded bolts and screws, this set is intended for mechanics, technicians and DIY users who require reliable long-reach hex keys for assembly, maintenance and repair tasks.

Advantages

The long hex keys deliver extended access to hard-to-reach fasteners while maintaining torque control thanks to their length and consistent hex profile. Each key is paired to a clearly marked size for faster selection, and the set includes a range of small to larger inch sizes to cover common applications. Constructed from hardened steel with a precise hex geometry, the tools resist rounding and provide consistent engagement with fastener heads.

Suitable for

• Reaching recessed or deep-set hex bolts and screws in machinery and equipment
• Assembly and disassembly of inch-threaded components
• Maintenance, repair and adjustment tasks in automotive and mechanical workshops
• DIY projects requiring long-reach hex keys for confined or awkward spaces

Key specifications

• Number of pieces: 13
• Size range: 0.050" to 3/8" (inch sizes)
• Design: long-leg hex key (extended reach)
• Material: hardened steel with precision-machined hex profile
• Finish: corrosion-resistant coating for durability

How to use

Select the hex key that matches the fastener size, insert the short or long end into the hex socket as required for reach and leverage, and apply steady torque while keeping the tool aligned with the fastener to avoid cam-out. For deeper access, use the long leg to reach recessed heads; for higher torque, use the short leg as the driver with the long leg inserted into the fastener.

Usage recommendations

Store the set in its holder to keep sizes organized and prevent loss. Inspect hex keys before use for wear or rounding; replace any damaged key to avoid damaging fasteners. Use appropriate personal protective equipment and avoid excessive force that could strip the hex head.