Stainless steel fasteners - pre-load and tightening torques - coarse metric threads

 
Thread Coeff friction Preload (Kn) property class Tightening torque (Nm) property class Min. breaking torque
A1-50 A2-70 A4-80 A1-50 A2-70 A4-80 A1-50 A2-70 A4-80
M1.6 0.1 0.4 0.55 0.55 0.1 0.1 0.2 0.15
0.2
 0.24
0.2 0.3 0.35 0.35 0.1 0.2 0.35
0.3 0.2 0.3 0.3 0.2 0.25 0.45
M2.0 0.1 0.5 0.6 0.6 0.15 0.2 0.3 0.3 0.4 0.48
0.2 0.4 0.5 0.5 0.25 0.3 0.4
0.3 0.25 0.36 0.36 0.4 0.4 0.55
M2.5 0.1 0.65 0.9 0.9 0.25 0.45 0.6 0.6 0.9 0.96
0.2 0.4 0.5 0.5 0.45 0.6 0.65
0.3 0.3 0.3 0.3 0.6 0.75 0.8
M3.0 0.1 0.9 1 1 0.85 1 1.3 1.1 1.6 1.8
0.2 0.6 0.65 0.65 1 1.1 1.6
0.3 0.4 0.45 0.45 1.25 1.35 1.85
M4.0 0.1 1.08 2.97 2.97 0.8 1.7 2.3 2.7 3.8 4.3
0.2 1.12 2.4 2.4 1.3 2.6 3.5
0.3 0.9 1.94 1.94 1.5 3 4.1
M5.0 0.1 2.26 4.85 4.85 1.6 3.4 4.6 5.5 7.8 8.8
0.2 1.83 3.93 3.93 2.4 5.1 6.9
0.3 1.49 3.19 3.19 2.8 6.1 8
M6.0 0.1 3.2 6.85 6.85 2.8 5.9 8 9.3 13 15
0.2 2.59 5.54 5.54 4.1 8.8 11.8
0.3 2.09 4.49 4.49 4.8 10.4 13.9
M8.0 0.1 5.86 12.6 12.6 6.8 14.5 19.3 23 32 37
0.2 4.75 10.2 10.2 10.1 21.4 28.7
0.3 3.85 8.85 8.85 11.9 25.5 33.9
 
Thread Coeff friction Preload (Kn) property class Tightening torque (Nm) property class Min. breaking torque
A1-50 A2-70 A4-80 A1-50 A2-70 A4-80 A1-50 A1-70 A4-80
M10.0 0.1 9.32 20 20 13.7 30 39.4 46 65 74
0.2 7.58 16.2 16.2 20.3 44 58
0.3 6.14 13.1 13.1 24 51 69
M12.0 0.1 13.6 29.1 29.1 23.6 50 67 80 110 130
0.2 11.1 23.7 23.7 34.8 74 100
0.3 9 19.2 19.2 41 88 117
M14.0 0.1 18.7 40 40 37.1 79 106 210 290 330
0.2 15.2 32.6 32.6 56 119 159
0.3 12.3 26.4 26.4 66 141 188
M.16.0 0.1 25.7 55 55 56 121 161      
0.2 20.9 44.9 44.9 86 183 245      
0.3 17 36.4 36.4 102 218 291      
M18.0 0.1 32.2 69 69 81 174 232      
0.2 26.2 56.2 56.2 122 260 346      
0.3 21.1 45.5 45.5 144 380 411      
M20.0 0.1 41.3 88.6 88.6 114 224 325      
0.2 33.8 72.4 72.4 173 370 494      
0.3 27.4 58.7 58.7 205 439 586      
M22.0 0.1 50 107 107 148 318 424      
0.2 41 88 88 227 488 650      
0.3 34 72 72 272 582 776      
M24.0 0.1 58 142 142 187 400 534      
0.2 47 101 101 284 608 810      
0.3 39 83 83 338 724 966      
 
Thread Coeff friction Preload (Kn) property class Tightening torque (Nm) property class Min. breaking torque
A1-50 A2-70 A4-80 A1-50 A2-70 A4-80 A1-50 A1-70 A4-80
M27.0 0.1 75     275          
0.2 61     421          
0.3 50     503          
M33.0 0.1 91     374          
0.2 75     571          
0.3 61     680          
M36.0 0.1 114     506          
0.2 94     779          
0.3 76     929          
M39.0 0.1 135     651          
0.2 110     998          
0.3 89     1189          
M42.0 0.1 162     842          
0.2 133     1300          
0.3 108     1553