Standard Metric Bolt Dimensions  
(All dimensions in units of mm or mm2 )

Bolt designation Nominal diam., D0 Pitch, 
 p		 Pitch diam.,
 dp		  Shank area, A0 Minor diam Area, Ar  Tensile Stress Area, A s
M4 4.0 0.70 3.5453 12.566 7.7496 8.78
M5 5.0 0.80 4.4804 19.635 12.683 14.18
M6 6.0 1.00 5.3505 28.274 17.894 20.12
M8 8.0 1.25 7.1881 50.265 32.841 36.61
M10 10.0 1.50 9.0257 78.540 52.292 58.00
M12 12.0 1.75 10.863 113.10 76.247 84.27
M16 16.0 2.00 14.701 201.06 144.12 156.67
M20 20.0 2.50 18.376 314.16 225.19 244.79
M22* 22.0 2.50 20.376 380.13 281.53 303.40
M24 24.0 3.00 22.051 452.39 324.27 352.50
M27* 27.0 3.00 25.051 572.56 427.09 459.41
M30 30.0 3.50 27.727 706.86 518.99 560.59
M33 33.0 3.50 30.727 855.30 647.19 693.55
M36 36.0 4.00 33.402 1017.9 759.28 816.72
M39 39.0 4.00 36.00 1194.6 912.87 976.00

Related important formulas: 
Minor diameter: Dr = D0 – 1.226869 p
         (P = longitudinal length per thread)
Tensile diameter: Dt = D0 – 0.938194 p
Pitch diameter: Dp = D0 – 0.75 p sin a, where  a = 600 is the pitch angle
Shear stress diameter: Dt = D0 (for shank in shear plane)

*  M22 x 2.5 and M27 x 3 for high strength structural steel fasteners only.

Standard størrelser for vanlig brukte sekskantskruer og 
sekskantmuttere med metriske gjenger

Last saved: 18 feb 2018 by HLG