This is a 17 mm hexagon key (Allen key) designed to engage and turn hexagonal socket fasteners. Its primary use is to apply controlled torque to metric internal hex screws and bolts for assembly, maintenance and adjustment tasks where a compact, reliable tool is required.

The tool is manufactured from chrome vanadium steel (Cr-V) and is heat-treated and tempered to provide torsional strength and wear resistance suitable for workshop and industrial use. The key has a standard 6‑point hexagon profile (across flats 17 mm) and a chamfered tip for easier insertion into sockets. The finish is a corrosion‑resistant black oxide (with options in polished chrome on selected lines), reducing surface rust and glare. The key is produced to common industry tolerances for hexagon keys compatible with DIN/ISO dimensions (for example ISO/DIN socket key tolerances) and to BS‑equivalent metric socket profiles, ensuring proper fit with ISO metric hex socket fasteners.

Typical applications include plant and machinery maintenance, automotive and heavy vehicle repair, mechanical and electrical assembly, metal fabrication and construction work, as well as general workshop use. Because of its 17 mm size, it is widely used on larger panel fastenings, machinery guards, drive components and structural assemblies where higher torque is required compared with smaller Allen keys.

Key benefits of this 17 mm hex key are its material strength and dimensional compatibility. The chrome vanadium construction and heat treatment give the tool the rigidity to resist bending and rounding under load, while the black oxide finish provides basic corrosion protection for long service life. Its metric 6‑point profile matches standard hex socket fasteners, reducing the risk of tool slippage and fastener damage. The simple L‑shaped form factor offers reach and leverage for a wide range of tightening and loosening tasks.

Duchy Fasteners stocks this 17 mm hexagon key in single units and in sets, and carries a full range of metric hex keys across common sizes to suit trade, maintenance and industrial requirements. Packs and bulk quantities are available on request.