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HSS Bottom Tap BSF ¼″ x 26 – Somta Series 531
The SOMTA 5310643 – ¼″ x 26 BSF HSS Bottom Tap is a high-precision threading tool designed for blind hole applications requiring full-depth thread engagement. Manufactured from durable high-speed steel (HSS), this bottoming tap features a short chamfer for clean starts and efficient threading at the base of holes. Complies with BSF (British Standard Fine) specifications, ideal for legacy assemblies, fine-thread repairs, and restoration projects.
Key Features Benefits
- Bottoming Chamfer (1–2 Lead Threads) – Optimized for threading to the base of blind holes.
- BSF Fine Thread Form – ¼″ diameter with 26 threads per inch, perfect for classic British fasteners.
- Straight Flute Geometry – Aids in smooth chip removal and accurate alignment.
- High-Speed Steel (HSS) – Provides excellent wear resistance and long-lasting performance.
- Bright Finish – Clean surface for improved inspection and cutting efficiency.
- Manual or Machine Use – Suitable for hand tapping or CNC/machine use.
Technical Specifications
- Part No: 5310643
- Thread Size: ¼″ x 26 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 5310643 BSF Bottom Tap?
- Precision Threading – Delivers consistent thread form for British Standard Fine fasteners.
- Bottoming Design – Reaches thread depth in blind holes without over-cutting.
- Reliable Performance – Trusted in restoration, repair, and engineering applications.
- Durable Build – HSS material ensures longevity and sustained cutting efficiency.
The SOMTA 5310643 is the ideal tool for producing accurate BSF threads in compact or blind hole settings, offering a professional finish for restoration and maintenance professionals.
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