The Torx Star Bit T55 x 75mm is a hexalobular (Torx) driver bit designed to engage T55 screws where high torque transfer and positive drive engagement are required. Its primary use is for fastening and removal of T55 Torx head screws in confined spaces where a 75mm shaft gives extra reach without sacrificing control, making it suitable for both manual and powered bit drivers.

This Draper Tools Group D bit is manufactured from S2 tool steel and is heat treated to improve torsional strength and durability. The 75mm overall length provides good access into recessed fasteners while the Torx T55 tip conforms to the hexalobular internal drive profile as specified in ISO 10664, providing accurate fit and reduced cam‑out compared with slotted or Phillips drives. The bit is finished with a protective black phosphate coating to give corrosion resistance and to aid in chip and wear performance. The shank is formed to accept standard 6.35mm (1/4in) hex bit holders and quick‑change adapters commonly used in hand drivers and powered bit holders.

Typical applications include automotive assembly and maintenance, agricultural and plant machinery servicing, industrial equipment installation, and building services work where Torx fasteners are widely used for their high torque capacity and repeatable engagement. The T55 size is often selected for larger assemblies, brackets and structural fixings where a robust drive interface is required. The bit is suitable for use in workshop settings, on-site maintenance and production environments where consistency and repeatability are important.

Key benefits of this T55 bit are its accurate ISO‑compliant tip geometry for reliable screw engagement, the S2 tool steel construction for resistance to torsional failure, and the black phosphate finish for improved corrosion resistance in workshop conditions. Its compatibility with standard 1/4in bit holders and quick‑change chucks makes it a versatile addition to technicians’ toolkits.

Duchy Fasteners stocks a wide range of Torx bits and driver sets in multiple sizes and lengths, available individually and in multi‑pack formats to suit trade, workshop and industrial requirements. If you need a different size or pack quantity, please contact our sales team.