Stainless Steel Fasteners - Pre-load and Tightening Torques

 
 
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          
  0.1 162     842          
0.2 133     1300          
0.3 108     1553          


Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.