This is a 5 mm internal hex socket bit designed for use with a 1/2" square drive ratchet, breaker bar or socket extension. Its primary use is to drive 5 mm hex (Allen) fasteners in situations where greater torque and access are needed than a conventional screwdriver can provide, such as automotive assemblies, machinery maintenance and general mechanical assembly work.

The bit is manufactured from chrome vanadium steel (Cr-V) and is heat treated and tempered to provide wear resistance and torsional strength suitable for hand-tool applications. The surface is finished with a satin chrome plating to improve corrosion resistance and to aid cleaning after use. The head type is a 5 mm internal hexagon (Allen) and the drive interface is a 1/2" (12.7 mm) square socket drive, compatible with standard 1/2" hand ratchets and socket sets. This product is produced to recognised DIN/ISO/BS dimensional standards for hand-tool bits, ensuring interchangeability with common 1/2" drive accessories and socket rails.

Typical applications include automotive repair and servicing, plant and machinery maintenance, agricultural equipment repair, metal fabrication and industrial assembly where hex socket fasteners are used. The larger 1/2" drive gives improved leverage and control when compared with smaller bit drivers, making this bit well suited to tasks requiring higher torque or access to recessed hex fasteners.

Key benefits include the corrosion resistance from the chrome finish, the strength and durability provided by the Cr‑V material and heat treatment, and broad compatibility with 1/2" drive tools and socket systems. The internal hex geometry offers positive engagement with hex fasteners to reduce rounding or cam‑out when used correctly. This bit is intended for hand-tool use; for impact driver applications use an impact-rated S2 or Cr‑Mo variant.

Duchy Fasteners stocks socket bits in a wide size range and pack formats. This 5 mm hex 1/2" drive bit is available individually and as part of multi-bit sets; ask us for specific size ranges or bespoke pack quantities to suit your workshop requirements.