Metric Coarse Thread
Metric Coarse Thread
Threaded fasteners, bolts, nuts, screws and fastenings
| ISO Metric Coarse | PITCH | Major Diameter | Root Radius | Pitch Diameter | Minor Diameter male thread | Minor Diameter female thread | Thread Height male thread | Thread Height female thread | Tap Drill |
|---|---|---|---|---|---|---|---|---|---|
| P | d=D | r | d2=D2 | d3 | D1 | h3 | H1 | ||
| M1 | 0.25 | 1.00 | 0.036 | 0.838 | 0.693 | 0.729 | 0.153 | 0.135 | 0.75 |
| M1.1 | 0.25 | 1.10 | 0.036 | 0.938 | 0.793 | 0.829 | 0.153 | 0.135 | 0.85 |
| M1.2 | 0.25 | 1.20 | 0.036 | 1.038 | 0.893 | 0.929 | 0.153 | 0.135 | 0.95 |
| M1.4 | 0.30 | 1.40 | 0.043 | 1.205 | 1.032 | 1.075 | 0.184 | 0.162 | 1.10 |
| M1.6 | 0.35 | 1.60 | 0.051 | 1.373 | 1.171 | 1.221 | 0.215 | 0.189 | 1.25 |
| M1.8 | 0.35 | 1.80 | 0.051 | 1.573 | 1.371 | 1.421 | 0.215 | 0.189 | 1.45 |
| M2 | 0.40 | 2.00 | 0.058 | 1.740 | 1.509 | 1.567 | 0.245 | 0.217 | 1.60 |
| M2.2 | 0.45 | 2.20 | 0.065 | 1.908 | 1.648 | 1.713 | 0.276 | 0.244 | 1.75 |
| M2.5 | 0.45 | 2.50 | 0.065 | 2.208 | 1.948 | 2.013 | 0.276 | 0.244 | 2.05 |
| M3 | 0.50 | 3.00 | 0.072 | 2.675 | 2.387 | 2.459 | 0.307 | 0.271 | 2.50 |
| M3.5 | 0.60 | 3.50 | 0.087 | 3.110 | 2.764 | 2.850 | 0.368 | 0.325 | 2.90 |
| M4 | 0.70 | 4.00 | 0.101 | 3.545 | 3.141 | 3.242 | 0.429 | 0.379 | 3.30 |
| M4.5 | 0.75 | 4.50 | 0.108 | 4.013 | 3.580 | 3.688 | 0.460 | 0.406 | 3.80 |
| M5 | 0.80 | 5.00 | 0.115 | 4.480 | 4.019 | 4.134 | 0.491 | 0.433 | 4.20 |
| M6 | 1.00 | 6.00 | 0.144 | 5.350 | 4.773 | 4.917 | 0.613 | 0.541 | 5.00 |
| M7 | 1.00 | 7.00 | 0.144 | 6.350 | 5.773 | 5.917 | 0.613 | 0.541 | 6.00 |
| M8 | 1.25 | 8.00 | 0.180 | 7.188 | 6.466 | 6.647 | 0.767 | 0.677 | 6.80 |
| M9 | 1.25 | 9.00 | 0.180 | 8.188 | 7.466 | 7.647 | 0.767 | 0.677 | 7.80 |
| M10 | 1.50 | 10.00 | 0.217 | 9.026 | 8.160 | 8.376 | 0.920 | 0.812 | 8.50 |
| M11 | 1.50 | 11.00 | 0.217 | 10.026 | 9.160 | 9.376 | 0.920 | 0.812 | 9.50 |
| M12 | 1.75 | 12.00 | 0.253 | 10.863 | 9.853 | 10.106 | 1.074 | 0.947 | 10.20 |
| M14 | 2.00 | 14.00 | 0.289 | 12.701 | 11.546 | 11.835 | 1.227 | 1.083 | 12.00 |
| M16 | 2.00 | 16.00 | 0.289 | 14.701 | 13.546 | 13.835 | 1.227 | 1.083 | 14.00 |
| M18 | 2.50 | 18.00 | 0.361 | 16.376 | 14.933 | 15.394 | 1.534 | 1.353 | 15.50 |
| M20 | 2.50 | 20.00 | 0.361 | 18.376 | 16.933 | 17.294 | 1.534 | 1.353 | 17.50 |
| M22 | 2.50 | 22.00 | 0.361 | 20.376 | 18.933 | 19.294 | 1.534 | 1.353 | 19.50 |
| M24 | 3.00 | 24.00 | 0.433 | 22.051 | 20.319 | 20.752 | 1.840 | 1.624 | 21.00 |
| M27 | 3.00 | 27.00 | 0.433 | 25.051 | 23.319 | 23.752 | 1.840 | 1.624 | 24.00 |
| M30 | 3.50 | 30.00 | 0.505 | 27.727 | 25.706 | 26.211 | 2.147 | 1.894 | 26.50 |
| M33 | 3.50 | 33.00 | 0.505 | 30.727 | 28.706 | 29.211 | 2.147 | 1.894 | 29.50 |
| M36 | 4.00 | 36.00 | 0.577 | 33.402 | 31.093 | 31.670 | 2.454 | 2.165 | 32.00 |
| M39 | 4.00 | 39.00 | 0.577 | 36.402 | 34.093 | 34.670 | 2.454 | 2.165 | 35.00 |
| M42 | 4.50 | 42.00 | 0.650 | 39.077 | 36.479 | 37.129 | 2.760 | 2.436 | 37.50 |
| M45 | 4.50 | 45.00 | 0.650 | 42.077 | 39.479 | 40.129 | 2.760 | 2.436 | 40.50 |
| M48 | 5.00 | 48.00 | 0.722 | 44.752 | 41.866 | 42.857 | 3.067 | 2.706 | 43.00 |
| M52 | 5.00 | 52.00 | 0.722 | 48.752 | 45.866 | 46.587 | 3.067 | 2.706 | 47.00 |
| M56 | 5.50 | 56.00 | 0.794 | 52.428 | 49.252 | 50.046 | 3.374 | 2.977 | 50.50 |
| M60 | 5.50 | 60.00 | 0.794 | 56.428 | 53.252 | 54.046 | 3.374 | 2.977 | 54.50 |
| M64 | 6.00 | 64.00 | 0.866 | 60.103 | 56.639 | 57.505 | 3.681 | 3.248 | 58.00 |
| M68 | 6.00 | 68.00 | 0.866 | 64.103 | 60.639 | 61.505 | 3.681 | 3.248 | 62.00 |
Metric screw threads are the most commonly used worldwide type of general-purpose screw thread. They were one of the first international standards agreed when the International Organization for Standardization that was set up in 1947, metric bolt and screw threads but did not come into widespread use until 1960.
