14. Tap, Thread Limits Production data ■ for Metric Threads unit: mm Major Pitch Diameter Minor Major Pitch Diameter Minor Diameter Diameter Diameter Diameter Size Class Upper Lower Size Class Upper Lower Basic Size Basic Size Tolerance Tolerance Basic Size Basic Size Basic Size Tolerance Tolerance Basic Size (μm) (μm) (μm) (μm) + + + + P1 25 10 P1 25 10 M 1 × 0.25 G4 1.000 0.838 51 38 0.729 b 20 5 M 2.3 × 0.4 2.300 2.040 1.867 ISO2 28 17 G4 51 38 M 1 × 0.2 P1 1.000 0.870 25 10 0.783 ISO2 36 21 P1 25 10 M 2.3 × 0.25 P1 2.300 2.138 25 10 2.029 M 1.1 × 0.25 1.100 0.938 0.829 ISO2 28 17 P2 40 25 M 1.1 × 0.2 P1 1.100 0.970 25 10 0.883 b 20 5 P1 25 10 M 2.5 × 0.45 G5 2.500 2.208 64 51 2.013 M 1.2 × 0.25 1.200 1.038 0.929 ISO2 28 17 ISO2 38 23 M 1.2 × 0.2 P1 1.200 1.070 25 10 0.983 D3 39 24 P1 25 10 M 2.5 × 0.35 P1 2.500 2.273 25 10 2.121 M 1.4 × 0.3 G4 1.400 1.205 51 38 1.075 P1 25 10 ISO2 30 18 b 20 5 M 2.6 × 0.45 2.600 2.308 2.113 M 1.4 × 0.2 P1 1.400 1.270 25 10 1.183 G5 64 51 P2 40 25 ISO2 38 23 G4 51 38 M 2.6 × 0.35 P1 2.600 2.373 25 10 2.221 M 1.6 × 0.35 1.600 1.373 1.221 ISO2 34 20 P2 40 25 D3 39 24 b 20 5 M 1.6 × 0.2 P1 1.600 1.470 25 10 1.383 M3 × 0.5 G5 3.000 2.675 64 51 2.459 P1 25 10 ISO2 40 24 M 1.7 × 0.35 G4 1.700 1.473 51 38 1.321 D3 39 24 ISO2 34 20 M3 × 0.6 P1 3.000 2.610 25 10 2.350 M 1.7 × 0.2 P1 1.700 1.570 25 10 1.483 P2 40 25 P2 40 25 M3 × 0.35 G5 3.000 2.773 64 51 2.621 G4 51 38 ISO2 36 21 M 1.8 × 0.35 1.800 1.573 1.421 ISO2 34 20 P2 40 25 D3 39 24 b 20 5 M 1.8 × 0.2 P1 1.800 1.670 25 10 1.583 M 3.5 ×0.6 G5 3.500 3.110 64 51 2.850 P1 25 10 ISO2 45 27 b 20 5 D4 52 32 M 2 × 0.4 G4 2.000 1.740 51 38 1.567 P2 40 25 ISO2 36 21 M 3.5 ×0.35 G5 3.500 3.273 64 51 3.121 D3 39 24 ISO2 36 21 M 2 × 0.25 P1 2.000 1.838 25 10 1.729 P2 40 20 P2 40 25 b 25 5 G5 64 51 M4 × 0.7 G6 4.000 3.545 76 64 3.242 M 2.2 × 0.45 2.200 1.908 1.713 ISO2 38 23 ISO2 48 29 Technical Information D3 39 24 D4 52 32 M 2.2 × 0.25 P1 2.200 2.038 25 10 1.929 M4 × 0.75 P2 4.000 3.513 40 20 3.188 P2 40 25 M4 × 0.5 G6 4.000 3.675 76 64 3.459 ISO2 40 24 Technical-23 794