Machining > Threading > Taps > Imperial - Spiral Flute Taps | Suttons Spiral Flute Taps - UNF | Dimensions | d1 (mm): 7.9375 | d2 (mm): 8 | l1 (mm): 72 | l2 (mm): 13 | l3 (mm): 30 | l4 (mm): 9 | Square Size (mm): 6.3 | z: 3 | Drill Size (mm): 6.9 (drill) | TPI: 24 (TPI) | Features | General purpose use | Suitable for materials up to 1000N/mm2 | Blind holes | Depths up to approx. 2.5 x d1 | Specifications | Designation: N (for normal general purpose type materials) | Material: Premium Grade High Speed Steel (HSSE-V3) | Finish: Bright | Max Cut Depth: 2.5xD | Shank Form: Reinforced Shank (with square drive) | Helix Angle: R40 | X: als | Type: Spiral Flute | Standard: ISO529 | Thread Form: UNF | Nut Tolerance: 2B | Lead: Form C / 3 x P | Applications | Steel - Non-alloy, cast & free cutting (~ 0.15 %C): Annealed | Steel - Non-alloy, cast & free cutting (~ 0.45 %C): Annealed | Steel - Low alloy & cast | Copper & Copper alloys (Brass/Bronze) - Free cutting, Pb > 1%