MAINTENANCE BASICS 7-21 METRIC FINE SCREW THREAD - TENSILE STRENGTH CLASS 10.9 Thread diameter of bolt mm Width across flat mm Steel Aluminium Cast (a) (b) Nm kpm Nm kpm M8 x 1 13 35 3.5 20.0 2.0 M10 x 1 17 (15) 75 7.5 42.0 4.2 M10 x 1.25 17 (15) 70 7.0 39.0 3.9 M12 x 1.25 19 125 12.5 70.0 7.0 M12 x 1.5 19 120 12.0 67.0 6.7 M14 x 1.5 22 200 20.0 110.0 11.0 M16 x 1.5 24 300 30.0 167.5 16.75 M18 x 1.5 27 440 44.0 243.0 24.3 M18 x 2 27 420 42.0 230.0 23.0 M20 x 1.5 30 620 62.0 338.5 33.85 M20 x 2 30 - - 322.5 32.25 M22 x 1.5 32 820 82.0 454.5 45.45 M22 x 2 32 - - 436.0 43.6 M24 x 1.5 36 1090 109.0 596.0 59.6 M24 x 2 36 1040 104.0 573.0 57.3 M27 x 2 41 1500 150.0 832.0 83.2 M30 x 2 46 2120 212.0 1158.0 115.8 M33 x 2 50 2800 280.0 - - M36 x 3 55 3500 350.0 - - M39 x 3 60 4600 460.0 - -