5/16" BSF HSS L/H Taper Tap
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BSF Left‑Hand HSS Hand Taps are designed for cutting British Standard Fine left‑hand threads, commonly used in older British‑engineered machinery, rotating assemblies, and applications where a standard right‑hand thread may loosen under vibration or reverse rotation. BSF’s fine‑pitch profile provides strong thread engagement and is ideal for precision mechanical work, restoration tasks, and assemblies requiring secure fastening in thinner materials. Made from high‑speed steel, these taps deliver smooth cutting performance, excellent durability, and consistent thread accuracy across materials such as mild steel, brass, aluminium, and copper alloys. With both Taper and Bottoming profiles available, this category supports easy thread starting, accurate sizing, and full‑depth finishing in blind holes. Smaller BSF sizes like 1/4", 5/16", and 3/8" are especially well‑suited for classic machinery repairs, automotive restorations, and precision imperial assemblies requiring dependable left‑hand thread formation.
| Item # | Description | Lead | Material | Pitch / TPI | Thread | Qty | Stock | Price | Action |
|---|---|---|---|---|---|---|---|---|---|
| 6578750 | |||||||||
| 6578770 | |||||||||
| 6578780 | |||||||||
| 6578800 |
- High‑speed steel construction for durability, smooth cutting, and long tool life
- Produces accurate left‑hand BSF threads for specialised and vintage British‑standard applications
- Fine‑pitch BSF profile ensures strong engagement and reliable fastening in thin or precision‑machined materials
- Suitable for mild steel, aluminium, brass, copper alloys, and other common workshop metals
- Available in Taper and Bottoming profiles for starting, sizing, and finishing threads
- Ideal for rotating assemblies, vintage equipment restoration, and British‑standard mechanical repairs
- Reliable workshop performance from Goliath, known for quality cutting tools