The OSG Threading Tap NPSF A-Spiral Flute is a precision tapping tool designed for engineers and machinists who need reliable NPSF threads in blind-hole applications. Built with FORME powder metal and a TiCN coating, it delivers durable, high-performance threading for hydraulic and pneumatic fittings.

• Thread form: NPSF (National Pipe Straight Fuel) threads for blind-hole tapping, ideal for accurate, leak‑free connections.
• Flute design: A‑Spiral flute enhances chip evacuation in blind holes, reducing clogging and improving surface finish.
• Material: FORME powder metal substrate delivers exceptional hardness and wear resistance for demanding cutting environments.
• Coating: TiCN coating lowers friction and boosts heat resistance, extending tool life and enabling cleaner finishes.
• Hand and standard: Right‑hand thread compatible with standard tapping operations; conforms to DIN 5156 specifications.
• Size: 3/8" diameter, 18 threads per inch (3/8 x 18 NPSF), suitable for common hydraulic and pneumatic fittings.
• Application: Specifically optimized for blind-hole threading across a range of metals, delivering consistent, high‑quality results.

This tap helps reduce production downtime by maintaining steady penetration and steady chip clearance, even in deeper blind holes. The combination of a robust powder-metal core and a wear-resisting TiCN coating supports faster cutting speeds, better thread accuracy, and longer service life, making it a dependable choice for workshop repairs, assembly, and precision fabrication of hydraulic and pneumatic systems.