Machining > Threading > Taps > Metric - Spiral Flute Taps | Suttons Spiral Flute Taps - IK | Dimensions | d1: M20 | d2 (mm): 16 | l1 (mm): 140 | l2 (mm): 25 | l4 (mm): 15 | Square Size (mm): 12 | z: 2 | Drill Size (mm): 17.5 (drill) | Pitch (mm): 2.5 (pitch) | Features | For high speed and precision tapping | For rigid tapping in CNC machines with synchronised feed for aluminium & aluminium alloys | Blind holes up to 2 x d1 | h6 endmill shank | Specifications | Designation: Al (for malleable aluminum with long chips) | Material: Powdered Metallurgy - Vanadium Grade High Speed Steel (PM-HSSE V3) | Finish: Chromium Nitride (CrN) | Max Cut Depth: 2xD | Shank Form: Reinforced Shank (square-end, drive-flat) | Helix Angle: R45 | X: ru | Type: Spiral Flute | Standard: Sutton | Thread Form: ISO Metric Coarse (M) | Nut Tolerance: 6HX | Lead: Form C / 3 x P | Applications | Aluminum & Magnesium, wrought alloy - Non Heat Treatable | Aluminum & Magnesium, wrought alloy - Heat Treatable: Age Hardened | Aluminum & Magnesium, cast alloy 12% Si - Non Heat Treatable | Aluminum & Magnesium, cast alloy 12% Si - Heat Treatable: Age Hardened | Copper & Copper alloys (Brass/Bronze) - Free cutting, Pb > 1% | Copper & Copper alloys (Brass/Bronze) - Brass (CuZn, CuSnZn) | Copper & Copper alloys (Brass/Bronze) - Bronze (CuSn)