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  Ultimate Loads and Torques..

In accordance with BS EN IOS 898-1 : 1999

Use these numbers only as rough estimates for maximum values

- FASTENER SIZE
- M6 M8 M10 M12 M14 M16 M20 M22 M24 M30 M36
Pitch mm 1.0 1.25 1.50 1.75 2.0 2.0 2.5 2.5 3.0 3.5 4.0
Stress Area mm2 20.1 36.6 58 84.3 115 157 245 303 353 561 817
 
- GRADE - - - - - - - - - - -
Minimum
Tensile
Load (kN)
4,6 8,04 14,6 28,2 33,7 46 62,8 98 121 141 224 327
8,8 16,1 29,2 46,4 67,4 92 125 203 252 293 466 678
10,9 20,9 38,1 60,3 87,7 120 168 255 315 367 583 850
12,9 24,5 44,6 70,8 103 140 192 299 370 431 684 997
 
Proof
Loads
(kN)
4,6 4,52 8,24 13 19 25,9 35,3 55,1 68,2 79,4 126 184
8,8 11,6 21,2 33,7 48,9 66,7 91 147 182 212 337 490
10,9 16,7 30,4 48,1 70 95,5 130 203 212 293 466 678
12,9 19,5 35,5 56,3 81,8 112 152 238 294 342 544 792
 
Maximum
Torque Nm
4,6 4,6104 11,2064 22,1 38,76 61,642 96,016 187,34 255,068 323,952 642,6 1126,08
8,8 11,832 28,832 57,29 99,756 158,746 247,52 499,8 680,68 864,96 1718,7 2998,8
10,9 17,034 41,344 81,77 142,8 227,29 353,6 690,2 792,88 1195,44 2376,6 4149,36
12,9 19,89 48,28 95,71 166,872 266,56 413,44 809,2 1099,56 1395,36 2774,4 4847,04

Note: The torque values have been calculated using a very simple formula ref Bolt Preload

Torque = K.Fm.d


K = 0.2 is a constant from Machinery's Handbook for thread and collar friction coefficient =0,15
d = nominal diameter (m)
F m = Maximimum Bolt tension (0,85.Proof load)



Relevant Links
  1. Tribology -ABC..Very useful calculator for calculating the torque for any screw
  2. Tohnichi -Screw Torque..Download with Lots of relevant information , equations and tables

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Last Updated 23/01/2013