DIN 912 Socket Head Cap Screw Dimensions Size (d1) Thread Pitch Head Diameter (d2) Head Height (k) Key Size (s) Key Engagement (t) Min Max Min Max Min Max Nominal M1.4 0.30 2.46 2.74 1.26 1.40 1.320 1.360 0.6 M1.6 0.35 2.86 3.14 1.46 1.60 1.520 1.560 0.7 M2 0.40 3.62 3.98 1.86 2.00 1.520 1.560 1 M2.5 0.45 4.32 4.68 2.36 2.50 2.020 2.060 1.1 M3 0.50 5.32 5.68 2.86 3.00 2.520 2.580 1.3 M4 0.70 6.78 7.22 3.82 4.00 3.020 3.080 2 M5 0.80 8.28 8.72 4.82 5.00 4.020 4.095 2.5 M6 1.00 9.78 10.22 5.70 6.00 5.020 5.140 3 M8 1.25 12.73 13.27 7.64 8.00 6.020 6.140 4 M10 1.50 15.73 16.27 9.64 10.00 8.025 8.175 5 M12 1.75 17.73 18.27 11.57 12.00 10.025 10.175 6 M14 2.00 20.67 21.33 13.57 14.00 12.032 12.212 7 M16 2.00 23.67 24.33 15.57 16.00 14.032 14.212 8 M18 2.50 26.67 27.33 17.57 18.00 14.032 14.212 9 M20 2.50 29.67 30.33 19.48 20.00 17.050 17.230 10 M22 2.50 32.61 33.39 21.48 22.00 17.050 17.230 11 M24 3.00 35.61 36.39 23.48 24.00 19.050 19.275 12 M27 3.00 39.61 40.39 26.48 27.00 19.065 19.275 13.5 M30 3.50 44.61 45.39 29.48 30.00 22.065 22.275 15.5 M33 3.50 49.61 50.39 32.38 33.00 24.065 24.275 18 M36 4.00 53.54 54.56 35.38 36.00 27.065 27.275 19 M39 4.00 57.54 58.46 38.38 39.00 27.065 27.275 22 M42 4.50 62.54 63.46 41.38 42.00 32.080 32.330 24 M45 4.50 66.54 67.46 44.38 45.00 32.080 32.330 24 M48 5.00 71.54 72.46 47.38 48.00 36.080 36.330 28 M56 5.50 93.46 84.54 55.26 56.00 41.080 41.330 34 M64 6.00 95.46 96.54 63.26 64.00 46.080 46.330 38 M72 6.00 107.46 108.54 71.26 72.00 55.100 55.400 43 M80 6.00 119.46 120.54 79.26 80.00 65.100 65.400 48 M90 6.00 134.37 135.63 89.13 90.00 75.100 75.400 54 M100 6.00 149.37 150.63 99.13 100 85.120 85.470 60