Metric Threads ISO 724

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ISO 724 - ISO general-purpose metric screw threads - Basic dimensions (DIN 13), the standard in Europe, is recognizable by its cylindrical outer and inner diameter and its precise outer diameter in millimeters.

ISO 724 Thread Representation

Thread Dimensional Data

d = Basic Nominal Diameter
D2 = Pitch Diameter Internal Thread
d2Pitch Diameter External Thread
D1 = Minor Diameter Internal Thread
d1 = Minor Diameter External Thread
H = Height of Fundamental Thread Triangle
P = Pitch


 

The equations to calulate THread Dimensional Data:

ISO 724 Equation
Thread Equations ISO 724

ISO 724: The following is ISO general-purpose metric screw threads chart. 

All chart data given in mm

Metric Screw Threads ISO 724
Nominal
Diameter
Pitch Root
Radius
Pitch
diameter
Minor Diameter Thread Height Tap Drill
mm
 External Thrd    Internal Thrd Internal Thrd External Thrd
M 1.00 0.25 0.036 0.838 0.693 0.729 0.153 0.135 0.75
M 1.10 0.25 0.036 0.938 0.793 0.829 0.153 0.135 0.85
M 1.20 0.25 0.036 1.038 0.893 0.929 0.153 0.135 0.95
M 1.40 0.30 0.043 1.205 1.032 1.075 0.184 0.162 1.10
M 1.60 0.35 0.051 1.373 1.171 1.221 0.215 0.189 1.25
M 1.80 0.35 0.051 1.573 1.371 1.421 0.215 0.189 1.45
M 2.00 0.40 0.058 1.740 1.509 1.567 0.245 0.217 1.60
M 2.20 0.45 0.065 1.908 1.648 1.713 0.276 0.244 1.75
M 2.50 0.45 0.065 2.208 1.948 2.013 0.276 0.244 2.05
M 3.00 0.50 0.072 2.675 2.387 2.459 0.307 0.271 2.50
M 3.50 0.60 0.087 3.110 2.764 2.850 0.368 0.325 2.90
M 4.00 0.70 0.101 3.545 3.141 3.242 0.429 0.379 3.30
M 4.50 0.75 0.108 4.013 3.580 3.688 0.460 0.406 3.80
M 5.00 0.80 0.115 4.480 4.019 4.134 0.491 0.433 4.20
M 6.00 1.00 0.144 5.350 4.773 4.917 0.613 0.541 5.00
M 7.00 1.00 0.144 6.350 5.773 5.917 0.613 0.541 6.00
M 8.00 1.25 0.180 7.188 6.466 6.647 0.767 0.677 6.80
M 9.00 1.25 0.180 8.188 7.466 7.647 0.767 0.677 7.80
M 10.00 1.50 0.217 9.026 8.160 8.376 0.920 0.812 8.50
M 11.00 1.50 0.217 10.026 9.160 9.376 0.920 0.812 9.50
M 12.00 1.75 0.253 10.863 9.853 10.106 1.074 0.947 10.20
M 14.00 2.00 0.289 12.701 11.546 11.835 1.227 1.083 12.00
M 16.00 2.00 0.289 14.701 13.546 13.835 1.227 1.083 14.00
M 18.00 2.50 0.361 16.376 14.933 15.394 1.534 1.353 15.50
M 20.00 2.50 0.361 18.376 16.933 17.294 1.534 1.353 17.50
M 22.00 2.50 0.361 20.376 18.933 19.294 1.534 1.353 19.50
M 24.00 3.00 0.433 22.051 20.319 20.752 1.840 1.624 21.00
M 27.00 3.00 0.433 25.051 23.319 23.752 1.840 1.624 24.00
M 30.00 3.50 0.505 27.727 25.706 26.211 2.147 1.894 26.50
M 33.00 3.50 0.505 30.727 28.706 29.211 2.147 1.894 29.50
M 36.00 4.00 0.577 33.402 31.093 31.670 2.454 2.165 32.00
M 39.00 4.00 0.577 36.402 34.093 34.670 2.454 2.165 35.00
M 42.00 4.50 0.650 39.077 36.479 37.129 2.760 2.436 37.50
M 45.00 4.50 0.650 42.077 39.479 40.129 2.760 2.436 40.50
M 48.00 5.00 0.722 44.752 41.866 42.857 3.067 2.706 43.00
M 52.00 5.00 0.722 48.752 45.866 46.587 3.067 2.706 47.00
M 56.00 5.50 0.794 52.428 49.252 50.046 3.374 2.977 50.50
M 60.00 5.50 0.794 56.428 53.252 54.046 3.374 2.977 54.50
M 64.00 6.00 0.866 60.103 56.639 57.505 3.681 3.248 58.00
M 68.00 6.00 0.866 64.103 60.639 61.505 3.681 3.248 62.00
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