Castle Nuts IS 2232: 1967IS- 5368: 1969 Unit : mm Sized d2 w m n s Size of Split Pin Max Min Max Min Max Min Nominal Nominal M12 X 1.25 17.0 16.57 15.0 14.57 10.0 9.42 3.5 19.0 3.2 M12 X 1.25 17.0 16.57 10.0 9.64 6.0 5.52 3.5 19.0 3.2 M14 X 1.50 19.0 18.48 16.0 15.57 11.0 10.30 3.5 22.0 3.2 M14 X 1.50 19.0 18.48 11.0 10.57 7.0 6.42 3.5 22.0 3.2 M16 X 1.50 22.0 21.48 19.0 18.48 13.0 12.30 4.5 24.0 4 M16 X 1.50 22.0 21.48 12.0 11.57 7.0 6.42 4.5 24.0 4 M18 X 1.50 25.0 24.48 21.0 20.48 15.0 14.30 4.5 27.0 4 M18 X 1.50 25.0 24.48 13.0 12.57 8.0 7.42 4.5 27.0 4 M20 X 1.50 28.0 27.48 22.0 21.48 16.0 15.30 4.5 30.0 4 M20 X 1.50 28.0 27.48 13.0 12.57 8.0 7.42 4.5 30.0 4 M22 X 1.50 30.0 29.48 26.0 25.48 18.0 17.30 5.5 32.0 5 M22 X 1.50 30.0 29.48 15.0 14.57 9.0 8.42 5.5 32.0 5 M24 X 2 34.0 33.38 27.0 26.48 19.0 18.16 5.5 36.0 5 M24 X 2 34.0 33.38 15.0 14.57 9.0 8.42 5.5 36.0 5 M27 X 2 38.0 37.38 30.0 29.48 22.0 21.16 5.5 41.0 5 M27 X 2 38.0 37.38 17.0 16.57 11.0 10.30 5.5 41.0 5 M30 X 2 42.0 41.38 33.0 32.38 24.0 23.16 7.0 46.0 6.3 M30 X 2 42.0 41.38 18.0 17.57 11.0 10.30 7.0 46.0 6.3 M33 X 2 46.0 45.38 35.0 34.38 26.0 25.16 7.0 50.0 6.3 M33 X 2 46.0 45.38 20.0 19.48 13.0 12.30 7.0 50.0 6.3 M36 X 3 50.0 49.38 38.0 37.38 29.0 28.16 7.0 55.0 6.3 M36 X 3 50.0 49.58 20.0 19.48 13.0 12.30 7.0 55.0 6.3 M39 X 3 55.0 54.26 40.0 39.38 31.0 30.00 7.0 60.0 6.3 M39 X 3 55.0 54.26 22.0 21.48 13.0 12.30 7.0 60.0 6.3 M42 58.0 57.26 46.0 45.38 34.0 33.00 9.0 65.0 8 M42 X 3 58.0 57.26 23.0 22.48 14.0 13.30 9.0 65.0 8 M45 62.0 61.26 48.0 47.38 36.0 35.00 9.0 70.0 8 M45 X 3 62.0 61.26 25.0 24.48 16.0 15.30 9.0 70.0 8 M48 65.0 64.26 50.0 49.38 38.0 37.00 9.0 75.0 8 M48 X 3 65.0 64.26 25.0 24.48 16.0 15.30 9.0 75.0 8 M52 70.0 69.26 54.0 53.26 42.0 41.00 9.0 80.0 8 M52 X 3 70.0 65.0 27.0 26.48 18.0 17.30 9.0 80.0 8 M56 75.0 74.26 57.0 56.26 45.0 44.00 9.0 85.0 8 M60 80.0 79.26 63.0 62.6 48.0 47.00 11.0 90.0 10 M64 85.0 84.13 66.0 65.26 51.0 49.80 11.0 95.0 10 M68 90.0 89.13 69.0 68.26 54.0 52.80 11.0 100.0 10 M72 X 6 95.0 94.13 73.0 72.26 58.0 56.80 11.0 105.0 10 M76 X 6 100.0 99.13 76.0 75.26 61.0 59.80 11.0 110.0 10 M80 X 6 105.0 104.13 79.0 78.26 64.0 62.80 11.0 115.0 10 M85 X 6 110.0 109.13 88.0 87.13 68.0 66.80 14.0 120.0 13 M90 X 6 120.0 119.30 92.0 91.13 72.0 70.80 14.0 130.0 13 M95 X 6 125.0 124.00 96.0 95.13 76.0 74.80 14.0 135.0 13 M100 X 6 135.0 134.00 100.0 99.13 80.0 78.80 14.0 145.0 13