The OSG BSW Spiral Flute Threading Tap in 1/2 x 12 is a precision tool designed for machinists who need clean, reliable internal threads in blind holes. Built from cobalt-enhanced HSS and finished with a durable steam oxide coating, it delivers long life and steady performance in demanding metalworking tasks.

• Threading standard: BSW (1/2" diameter, 12 TPI) designed for British Standard Whitworth threads in blind holes.
• Material: HSS-E with cobalt for exceptional hardness and heat resistance, extending cutting life under heavy use.
• Coating: Steam oxide coating enhances wear resistance and provides smoother cutting action in metal.
• Flute geometry: Spiral flute design promotes efficient chip evacuation in blind-hole tapping, reducing clogging and binding.
• Application: Optimized for producing accurate, repeatable threads in blind holes within steel and similar alloys.

By delivering consistent thread quality, this tap helps reduce rework and improves assembly reliability in production runs or repair work. The combination of a cobalt-infused HSS core and a durable steam oxide finish yields greater tool life and steadier performance, especially in tougher materials and higher-cutting-speed scenarios. The spiral flute design streamlines chip evacuation, keeping cutting forces manageable and reducing the risk of tap breakage in challenging blind-hole applications.