Thread Identification Chart (Metric)

A screw thread in conformity with this International Standard is designated by the letter M followed by the values of the nominal diameter and of the pitch expressed in millimeters separated by the sign x.
Example : M 8 x 1.0 (Fine pitch 1.0)
The absence of the indication of pitch means that the coarse pitch is specified.
Example : M 8 (Coarse pitch 1.25)
The words "coarse" and "fine" are given in order to conform to usage. No concept of quality however, is associated with these words. "Coarse" pitches are the largest metric pitches used. For the diameter selected, choose one of the pitches shown on the corresponding line.
Basic Major DiameterNominal Diameter (mm)STDPitch in mm
InchmmCoarseFine M Taper
.01180.300.30X0.075  
.01180.300.30*0.080  
.01380.350.35**0.090  
.01460.37     
.01570.400.40*X0.100  
.01650.42     
.01770.450.45**0.100  
.01890.48     
.01970.500.50*X0.125  
.02090.53     
.02130.54     
.02170.550.55**0.125  
.02360.600.60*X0.150  
.02440.62     
.02760.700.70 0.175  
.03110.79     
.03150.800.80*X0.200  
.03400.86     
.03540.900.90**X0.225  
.03941.001.00*X0.2500.2 
.04331.101.10**0.2500.2 
.04701.19     
.04721.201.20*X0.2500.2 
.05121.30     
.05511.401.40**X0.3000.2 
.05911.501.50 0.300  
.06001.52     
.06291.601.60*0.3500.2 
.06691.701.70X0.3500.2,0.25 
.07091.801.80**0.3500.2 
.07301.85     
.07481.90     
.07872.002.00*X0.4000.25,0.35 
.08602.18     
.08662.202.20**0.4500.25 
.09062.302.30X0.4000.25,0.35 
.09842.502.50*0.450.35 
.09902.51     
.10242.602.60X0.450.25,0.35 
.11022.80     
.11202.84     
.11813.003.00*X0.500.35 
.12503.18     
.12603.20     
.13803.503.50**X0.600.35,0.5 
.14173.60     
.15754.004.00*X0.700.5,0.75 
.16144.10     
.16404.17     
.17724.504.50**0.750.5 
.18504.70     
.18754.76     
.19004.83     
.19695.005.00*X0.800.5, 0.75, 0.90 
.20875.30     
.21605.49     
.21655.505.50***0.900.5 
.21885.56     
.23626.006.00*X1.000.5, 0.75 
.25006.35     
.27567.007.00***X1.000.5, 0.75 
.28127.14     
.31257.94     
.31257.94     
.31508.008.00*X1.250.5, 0.75, 1 
.35439.009.00***X1.250.75, 1 
.37509.53     
.38309.73    1
.393710.0010.00*X1.50.75, 1, 1.25 
.405010.29     
.433111.0011.00***X1.50.75, 1, 1.25 
.437511.11     
.472412.0012.00*X1.751, 1.25, 1.51.5
.500012.70     
.518013.16     
.540013.72     
.551214.0014.00**X2.001, 1.25, 1.5 
.562514.29     
.625015.88     
.629916.0016.00*X2.001, 1.51.5
.656016.66     
.675017.15     
.687517.46     
.708718.0018.00**X2.51, 1.5, 21.5
.750019.05     
.787420.0020*X2.51, 1.5, 21.5
.812520.64     
.825020.96     
.840021.34     
.866122.0022**X2.51, 1.5, 21.5
.875022.23     
.902022.91     
.937523.81     
.944924.0024*X31, 1.5, 2 
1.000025.40     
1.023626.0026***X 1.51.5
1.04101126.44     
1.050026.67     
1.062526.99     
1.063027.0027**X31, 1.5, 2 
1.125028.58     
1.181130.0030*X3.51, 1.5, 2, 3 
1.187530.16     
1.189030.20     
1.250031.75     
1.259832.0032***X 1.5, 2 
1.299233.0033**X3.51.5, 2, 3 
1.309033.25     
1.312533.34     
1.315033.40     
1.375034.93     
1.378035.0035***X 1.5 
1.417336.0036*X41.5, 2, 3 
1.437536.51     
1.492037.90   1.5 
1.496138.0038***X   
1.500038.10     
1.535439.0039**X41.5, 2, 3 
1.562539.69     
1.574840.0040***X 1.5, 2, 3 
1.625041.28     
1.650041.91     
1.653542.0042*X4.51.5, 2, 3, 4 
1.660042.16     
1.687542.86     
1.745044.32     
*     ISO Standard-1st Choice
**   ISO Standard-2nd Choice
*** ISO Standard-3rd Choice
X     DIN (German Standard)

*All information is strictly informative