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HSS Bottom Tap BSF ½″ x 16 – Somta Series 531
The SOMTA 5311273 – ½″ x 16 BSF HSS Bottom Tap is a precision threading tool designed for cutting full-depth internal threads in blind holes. Engineered from high-speed steel (HSS), this bottoming tap features a short chamfer for clean starts and maximum thread depth close to the hole bottom. It conforms to BSF (British Standard Fine) thread standards, making it ideal for general engineering, classic vehicle restoration, and fine-thread repair tasks.
Key Features Benefits
- Bottoming Chamfer (1–2 Lead Threads) – Enables threading to the full depth of blind holes.
- BSF Fine Thread Form – ½″ diameter with 16 threads per inch for legacy British fasteners.
- Straight Flute Geometry – Promotes smooth chip evacuation and easy alignment.
- High-Speed Steel (HSS) – Delivers excellent wear resistance and long tool life.
- Bright Finish – Clean surface finish supports smooth cutting and easy inspection.
- Manual or Machine Use – Compatible with tap wrenches and machine tapping units.
Technical Specifications
- Part No: 5311273
- Thread Size: ½″ x 16 TPI
- Thread Standard: BSF – British Standard Fine
- Tap Type: Bottoming (short lead for blind holes)
- Flute Style: Straight flute
- Cutting Direction: Right-hand
- Material Finish: High-Speed Steel (HSS), Bright
- Standard: BS 84 / ISO Equivalent
Why Choose the SOMTA 5311273 BSF Bottom Tap?
- Accurate Thread Cutting – Delivers reliable BSF thread profiles for legacy assemblies.
- Short Chamfer for Blind Holes – Maximizes thread engagement near hole bottom.
- Durable HSS Construction – Maintains sharpness and withstands tough material loads.
- Ideal for Engineering & Restoration – Perfect for fine-thread repairs in automotive and industrial settings.
The SOMTA 5311273 is trusted for critical threading work in precision applications. Whether in a workshop or maintenance environment, its HSS durability and bottoming design make it an essential tool for tapping blind BSF holes to full depth.
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