The Torx Star Bit T55 x 30MM is a hexalobular (Torx/TX) screwdriver bit designed to install and remove T55 Torx fasteners. Its primary use is for driving T55-sized Torx screws in assembly, maintenance and repair tasks where a precise, positive drive is required to prevent cam‑out and minimise fastener damage.

Manufactured for compatibility with standard 1/4" (6.35 mm) bit holders, the bit has a 30 mm working length and a Torx T55 head profile. The bit is produced from S2 tool steel and is heat treated to provide high hardness and wear resistance (typical hardness range HRC 58–62). The surface is finished with a black phosphate coating to improve corrosion resistance and reduce surface wear in normal workshop environments. The Torx profile conforms to industry Torx dimensions (ISO 10664 / BS equivalent tolerances), and the 1/4" hex shank meets common 1/4" holder dimensions so it will fit hand drivers, ratcheting bit holders and most powered screwdriver chucks.

This T55 bit is commonly used in automotive and commercial vehicle maintenance, mechanical and plant engineering, agricultural machinery servicing and industrial equipment assembly where larger Torx fasteners are specified. It is also suitable for workshop fitting tasks and professional DIY where a secure drive and repeatable torque transfer are important. The positive engagement of the Torx profile reduces screwdriver slip and protects both the screw head and the bit when compared with less precise drive types.

Key benefits include good corrosion resistance from the phosphate finish, strong wear resistance from S2 heat‑treated material, and broad compatibility with 1/4" bit holders and standard Torx fasteners. For heavy impact use, consider parts specifically rated for impact drivers. Duchy Fasteners stocks a wide range of Draper bits and accessories, and this T55 x 30 mm bit is available as a single item or in multi‑pack sets across common sizes and pack quantities. Product reference: Draper Tools Group D DR33356.