The OSG Threading Tap NPSF A-Spiral Flute is a precision tapping tool designed to form National Pipe Straight Fuel threads in blind holes. Built for professional machinists and production environments, it combines durability with consistent, high‑quality thread results in tight cavities.

• Thread type: NPSF (National Pipe Straight Fuel) threads for reliable, gas- and liquid-tight connections in blind-hole applications.
• Flute design: A‑Spiral flute enhances chip evacuation and reduces clogging during deeper taps, promoting smoother cutting.
• Material: FORME powder metal construction delivers exceptional wear resistance and longevity under demanding cutting conditions.
• Coating: TiCN coating provides improved heat resistance and lower friction, extending tool life and enabling stable cutting speeds.
• Cutting direction: Right-hand tap compatible with standard machining setups and conventional threading sequences.
• Standards: DIN5156 compliant to ensure dimensional accuracy and easy interchangeability with similar DIN-spec taps.
• Size: 1/4 x 18 for common NPSF blind-hole applications and precise fit in piping-related assemblies.

Designed to deliver dependable performance in metalworking workflows, this tap reduces downtime through extended tool life and better finish quality. The combination of FORME powder metal, TiCN coating, and the A‑spiral flute design translates to efficient material removal, cleaner threads, and fewer reworks in production environments where NPSF threads in blind holes are required. Ideal for hydraulic fittings, fuel system components, and other assemblies that demand precise, durable NPSF threading.