5/16" BSF 1" OD HSS Die

HSS BSF (British Standard Fine) Dies are precision-machined threading tools designed for cutting, repairing, and restoring external BSF threads—an imperial fine‑pitch standard commonly used in British engineering, automotive work, machinery restoration, and legacy equipment. Manufactured from high‑speed steel, these dies offer excellent hardness, wear resistance, and long‑term durability, ensuring clean, accurate, and consistent thread formation. BSF threads feature a finer pitch than their BSW counterparts, making them ideal for applications requiring higher tensile strength, improved vibration resistance, and secure fastening in mechanical assemblies. These dies are suitable for producing new threads or refurbishing worn or damaged fasteners, delivering professional‑quality results across a wide range of workshop metals such as steel, stainless steel, brass, and aluminium. Available in multiple outside diameters to suit different die stocks and cutting setups, BSF HSS Dies are essential for workshops, restoration specialists, mechanical engineers, and anyone working on British‑designed machinery.