The OSG BSF Spiral Flute Threading Tap provides machinists and toolmakers with a reliable solution for creating precise internal threads in blind holes. Built from HSS-E material and finished with a steam oxide coating, it supports consistent performance during demanding threading operations.

• Material: High-speed steel with cobalt (HSS-E) construction maintains edge strength at elevated temperatures.
• Coating: Steam oxide surface treatment reduces galling and improves wear resistance in ferrous materials.
• Flute Geometry: Spiral flute design directs chips upward and out of the hole, preventing packing in blind applications.
• Thread Form: BSF (British Standard Fine) profile delivers accurate thread geometry for legacy or imperial fastening systems.

This tap reduces the risk of tool breakage caused by chip accumulation and helps produce clean, full-profile threads without secondary cleaning steps, making it practical for production runs and maintenance work where blind-hole access is limited.