Torque Figures

  • Torque figures for bolts and screws with metric thread and head dimensions, as in DIN 912, 931, 934 etc.
  • The figures MA in this table include:
              a)coefficient of friction microns total + 0.14
              b)90% of minimum elongation
              c)torque figures when assembling fasteners
  • The coefficient of friction of microns total = 0.14 applies for fasteners without coating (self colour) when slighty lubricated.
  • Additional lubrication of the thread will substantially alter the coefficient of friction, leading to uncontrollable pre-load situations.
  • Pre-load situations will also be influenced by the fastening methods and tools used.
  • The following figures are guidelines only.
  • Figures in NM(Newton Meters)

Tightening Torques

(For Metric Coarse Thread Bolts and Screws) Based on coefficients of friction total of 0.100
Thread
Diameter
Property Classes
4.65.68.810.912.9
M41.021.373.04.45
M52.002.705.98.710
M63.504.60101518
M88.4011253643
M101722497284
M12293985125145
M144662135200235
M167195210310365
M1897130300430500
M20138184425610710
M22186250580820960
M242353157301,0501,220
M273504701,1001,5501,800
M3047536351,4502,1002,450
M3364588651,9702,7703,330
M368301,1112,5303,5604,280

Tightening Torques

(For Metric Fine Thread Bolts and Screws) Based on coefficients of friction total of 0.100
Thread
Diameter
Tightening Torque MA max (Nm)
Property Classes
8.810.912.9
M8 x 1.00223036
M10 x 1.25425971
M12 x 1.2576105130
M14 x 1.50120165200
M16 x 1.50180250300
M18 x 1.50260365435
M20 x 1.50360510610
M22 x 1.50480680810

M24 x 2.00

6108601,050
Conversion Figures
To get NCM from Nm     Nm x 100
To get inch pounds from Ncm     Ncm x 0.08851
To get foot pounds from Ncm     Ncm x 0.00737
To get foot pounds from NM     Nm x 0.7376

*All information is strictly informative

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