The OSG BSF Spiral Flute Threading Tap is a precision tapping tool designed for blind-hole work, built for machinists and maintenance professionals who demand accurate British Standard Fine threads. Crafted from HSS-E with a Steam Oxide coating, it combines toughness, heat resistance, and long tool life for demanding metalworking tasks.

• Size and Thread: 3/4" major diameter with 12 TPI BSF thread, optimized for blind-hole applications.
• Material: HSS-E (high-speed steel with cobalt) for enhanced hardness and sustained cutting performance.
• Coating: Steam Oxide finish provides wear resistance and a smoother cutting action in challenging materials.
• Flute Design: Spiral flute geometry enables efficient chip evacuation, reducing clogging in deep or blind holes.
• Application: Ideal for precise, consistent threading in metalworking where access is limited to blind holes.

The combination of cobalt-enhanced HSS and a durable oxide coating helps maintain sharpness under heat and friction, delivering clean, accurate threads while extending tap life. The spiral flute design supports reliable chip removal, lowering the risk of tap binding or breakage during tapping operations. This tap is well-suited for shop floors, machine shops, and maintenance environments that tackle regular blind-hole threading in steel, cast iron, and similar metals.