The OSG BSF A-Spiral Flute Threading Tap is engineered for precision British Standard Fine threads in blind holes, making it a reliable choice for metalworking and assembly projects where interior threads must be clean and accurate. Designed for right-hand threading, this tap delivers dependable performance in non-through holes with strong chip control.

• Thread Type: BSF (British Standard Fine) threads, DIN2184-1 specification for accurate internal threading in blind holes
• A-Spiral Flute Design: Optimized for efficient chip evacuation in blind holes, reducing snagging and packing during tapping
• Material: Powder metal construction for enhanced wear resistance and extended tool life
• Coating: TiCN (Titanium Carbonitride) coating lowers friction and improves heat resistance, enabling smoother cuts and longer tool durability
• Size: 3/8" diameter with 20 TPI (3/8 x 20) for standard BSF applications
• Orientation: Right-hand thread for conventional clockwise tapping
• Application: Specifically designed for blind holes in metal components where through-holes aren’t possible

This tap pairings a robust powder metal core with a durable TiCN coating to deliver consistent performance across multiple jobs. The combination supports higher cutting speeds, better surface finishes, and longer service life, which translates to fewer tool changes and more productive machining sessions. The tool is ideal for shops and maintenance environments that routinely create or repair BSF threads in confined interiors, helping you achieve clean, accurate threads that meet standard fastener specifications. For best results, use appropriate tapping fluids and steady feeds to maintain thread integrity and chip control throughout the cut.