Machining > Threading > Taps > Imperial - Spiral Flute Taps | Suttons Spiral Flute Taps - Black Magic | Dimensions | d1 (mm): 7.9375 | d2 (mm): 6 | l1 (mm): 90 | l2 (mm): 13 | l3 (mm): 35 | l4 (mm): 8 | Square Size (mm): 4.9 | z: 3 | Drill Size (mm): 6.6 (drill) | TPI: 18 (TPI) | Features | Universal high performance tapping | PM-HSSE V3 offers superior tool life | Use in stainless steels and high strength steels up to 850N/mm2 | Through holes up to 3 x d1 | Suitable for synchronous tapping in machine operations | Specifications | Designation: UNI (for normal general purpose type materials) | Material: Powdered Metallurgy - Vanadium Grade High Speed Steel (PM-HSSE V3) | Finish: Hardlube | Max Cut Depth: 3xD | Shank Form: Reduced Shank (with square drive) | Helix Angle: R50 | X: als | Type: Spiral Flute DIN2184-1 | Thread Form: UNC | Nut Tolerance: 2BX | 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 - Non-alloy, cast & free cutting (~ 0.45 %C): Quenched & Tempered | Steel - Low alloy & cast | Steel - High alloy, cast & tool: Annealed | Steel - Corrosion resistant & cast - Ferritic / Martensitic: Annealed | Stainless Steel - Austenitic: Age Hardened | Stainless Steel Duplex | Aluminum & Magnesium, wrought alloy - Non Heat Treatable | Aluminum & Magnesium, wrought alloy - Heat Treatable: Age Hardened | Aluminum & Magnesium, cast alloy 12% Si - Non Heat Treatable