ISO 724 - Metric Threads
Dimensions of metric threads according ISO 724
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ISO 724 specifies basic dimensions of metric threads in accordance with ISO 261. Dimensions refer to the basic profile in accordance with ISO 68.
There are three kinds of ISO metric threads:
- coarse
- fine
- extra fine
The thread angle is 60o. The thread depth is 0.614 x pitch.
Metric Threads - Coarse Thread Pitches
| Size - Nominal Diameter (mm) | Pitch1) (mm) Load Calculator! | Clearance Drill (mm) Load Calculator! | Tap Drill (mm) Load Calculator! | Tensile Stress Area (mm) Load Calculator! |
|---|---|---|---|---|
| M 1.6 | 0.35 | 1.8 | 1.25 | |
| M 2 | 0.40 | 2.4 | 1.60 | |
| M 2.5 | 0.45 | 2.90 | 2.00 | |
| M 3 | 0.50 | 3.40 | 2.50 | |
| M 3.5 | 0.60 | 3.90 | 2.90 | |
| M 4 | 0.70 | 4.50 | 3.30 | 8.78 |
| M 5 | 0.80 | 5.50 | 4.20 | 14.2 |
| M 6 | 1.00 | 6.60 | 5.00 | 20.1 |
| M 8 | 1.25 | 9.00 | 6.80 | 36.6 |
| M 10 | 1.50 | 12.00 | 8.50 | 58.0 |
| M 12 | 1.75 | 14.00 | 10.20 | 84.3 |
| M 14 | 2.00 | 16.00 | 12.00 | |
| M 16 | 2.00 | 18.00 | 14.00 | 157 |
| M 20 | 2.50 | 22.00 | 17.50 | 245 |
| M 22 | 2.50 | 25.00 | 19.50 | |
| M 24 | 3.00 | 27.00 | 21.00 | 353 |
| M 27 | 3.00 | 30.00 | 24.00 | |
| M 30 | 3.50 | 33.00 | 26.50 | 561 |
| M 36 | 4.00 | 40.00 | 32.00 | 817 |
| M 42 | 4.50 | 46.00 | 37.50 | 1120 |
| M 48 | 5.00 | 53.00 | 43.00 | 1470 |
| M 56 | 5.50 | 62.00 | 50.50 | 2030 |
| M 64 | 6.00 | 70.00 | 58.00 | 2680 |
| M 68 | 6.00 | 74.00 | 62.00 |
1) For metric threads pitch is the distance between threads.
- 1 mm = 0.039 inches
Metric Threads - Fine Thread Pitches
It is common to designate metric fine threads with the capital M plus an indication to their nominal outer diameter and their pitch:
M size x pitch
Example:
M 10 x 1.5
| Size - Nominal Diameter (mm) | Pitch1) (mm) Load Calculator! | Tap Drill (mm) Load Calculator! | Tebsile Stress Area (mm) Load Calculator! |
|---|---|---|---|
| M 1.0 x 0.2 | 0.20 | 0.80 | |
| M 1.1 x 0.2 | 0.20 | 0.90 | |
| M 1.2 x 0.2 | 0.20 | 1.00 | |
| M 1.4 x 0.2 | 0.20 | 1.20 | |
| M 1.6 x 0.2 | 0.20 | 1.40 | |
| M 1.8 x 0.2 | 0.20 | 1.60 | |
| M 2 x 0.25 | 0.25 | 1.75 | |
| M 2.2 x 0.25 | 0.25 | 1.95 | |
| M 2.5 x 0.35 | 0.35 | 2.10 | |
| M 3 x 0.35 | 0.35 | 2.60 | |
| M 3.5 x 0.35 | 0.35 | 3.10 | |
| M 4 x 0.5 | 0.50 | 3.50 | |
| M 4.5 x 0.5 | 0.50 | 4.00 | |
| M 5 x 0.5 | 0.50 | 4.50 | |
| M 5.5 x 0.5 | 0.50 | 5.00 | |
| M 6 x 0.75 | 0.75 | 5.20 | 20.1 |
| M 7 x 0.75 | 0.75 | 6.20 | |
| M 8 x 0.75 | 0.75 | 7.20 | |
| M 8 x 1.0 | 1.00 | 7.00 | 39.2 |
| M 9 x 0.75 | 0.75 | 8.20 | |
| M 9 x 1 | 1.00 | 8.00 | |
| M 10 x 0.75 | 0.75 | 9.20 | |
| M 10 x 1 | 1.00 | 9.00 | 64.5 |
| M 10 x 1.25 | 1.25 | 8.80 | 61.2 |
| M 11 x 0.75 | 0.75 | 10.20 | |
| M 11 x 1 | 1.00 | 10.00 | |
| M 12 x 1 | 1.00 | 11.00 | |
| M 12 x 1.25 | 1.25 | 10.80 | 92.1 |
| M 12 x 1.5 | 1.50 | 10.50 | 88.1 |
| M 14 x 1.0 | 1.00 | 13.00 | |
| M 14 x 1.25 | 1.25 | 12.80 | |
| M 14 x 1.5 | 1.50 | 12.50 | |
| M 15 x 1 | 1.00 | 14.00 | |
| M 15 x 1.5 | 1.50 | 13.50 | |
| M 16 x 1 | 1.00 | 15.00 | 178 |
| M 16 x 1.5 | 1.50 | 14.50 | 167 |
| M 17 x 1.0 | 1.00 | 16.00 | |
| M 17 x 1.5 | 1.50 | 15.50 | |
| M 18 x 1.0 | 1.00 | 17.00 | |
| M 18 x 1.5 | 1.50 | 16.50 | |
| M 18 x 2.0 | 2.00 | 16.00 | |
| M 20 x 1.0 | 1.00 | 19.00 | |
| M 20 x 1.5 | 1.50 | 18.50 | 272 |
| M 20 x 2.0 | 2.00 | 18.00 | 258 |
| M 22 x 1.0 | 1.00 | 21.00 | |
| M 22 x 1.5 | 1.50 | 20.50 | |
| M 22 x 2.0 | 2.00 | 20.00 | |
| M 24 x 1.0 | 1.00 | 23.00 | |
| M 24 x 1.5 | 1.50 | 22.50 | 401 |
| M 24 x 2.0 | 2.00 | 22.00 | 384 |
| M 25 x 1.0 | 1.00 | 24.00 | |
| M 25 x 1.5 | 1.50 | 23.50 | |
| M 25 x 2.0 | 2.00 | 23.00 | |
| M 27 x 1.0 | 1.00 | 26.00 | |
| M 27 x 1.5 | 1.50 | 25.50 | |
| M 27 x 2.0 | 2.00 | 25.00 | |
| M 28 x 1.0 | 1.00 | 27.00 | |
| M 28 x 1.5 | 1.50 | 26.50 | |
| M 28 x 2.0 | 2.00 | 26.00 | |
| M 30 x 1.0 | 1.00 | 29.00 | |
| M 30 x 1.5 | 1.50 | 28.50 | |
| M 30 x 2.0 | 2.00 | 28.00 | 621 |
| M 30 x 3.0 | 3.00 | 27.00 | 581 |
| M 32 x 1.5 | 1.50 | 30.50 | |
| M 32 x 2.0 | 2.00 | 30.00 | |
| M 33 x 1.5 | 1.50 | 31.50 | |
| M 33 x 2.0 | 2.00 | 31.00 | |
| M 33 x 3.0 | 3.00 | 30.00 | |
| M 35 x 1.5 | 1.50 | 33.50 | |
| M 35 x 2.0 | 2.00 | 33.00 | |
| M 36 x 1.5 | 1.50 | 34.50 | |
| M 36 x 2.0 | 2.00 | 34.00 | 915 |
| M 36 x 3.0 | 3.00 | 33.00 | 865 |
| M 39 x 1.5 | 1.50 | 37.50 | |
| M 39 x 2.0 | 2.00 | 37.00 | |
| M 39 x 3.0 | 3.00 | 36.00 | |
| M 40 x 1.5 | 1.50 | 38.50 | |
| M 40 x 2.0 | 2.00 | 38.00 | |
| M 40 x 3.0 | 3.00 | 37.00 | |
| M 42 x 1.5 | 1.50 | 40.50 | |
| M 42 x 2.0 | 2.00 | 40.00 | |
| M 42 x 3.0 | 3.00 | 39.00 | 1210 |
| M 42 x 4.0 | 4.00 | 38.00 | 1150 |
| M 45 x 1.5 | 1.50 | 43.50 | |
| M 45 x 2.0 | 2.00 | 43.00 | |
| M 45 x 3.0 | 3.00 | 42.00 | |
| M 45 x 4.0 | 4.00 | 41.00 | |
| M 48 x 1.5 | 1.50 | 46.50 | |
| M 48 x 2.0 | 2.00 | 46.00 | |
| M 48 x 3.0 | 3.00 | 45.00 | 1600 |
| M 48 x 4.0 | 4.00 | 44.00 | 1540 |
| M 50 x 1.5 | 1.50 | 48.50 | |
| M 50 x 2.0 | 2.00 | 48.00 | |
| M 50 x 3.0 | 3.00 | 47.00 | |
| M 52 x 1.5 | 1.50 | 50.50 | |
| M 52 x 2.0 | 2.00 | 50.00 | |
| M 52 x 3.0 | 3.00 | 49.00 | |
| M 52 x 4.0 | 4.00 | 48.00 | |
| M 55 x 1.5 | 1.50 | 53.50 | |
| M 55 x 2.0 | 2.00 | 53.00 | |
| M 55 x 3.0 | 3.00 | 52.00 | |
| M 55 x 4.0 | 4.00 | 51.00 | |
| M 56 x 1.5 | 1.50 | 54.50 | |
| M 56 x 2.0 | 2.00 | 54.00 | |
| M 56 x 3.0 | 3.00 | 53.00 | |
| M 56 x 4.0 | 4.00 | 52.00 | |
| M 58 x 1.5 | 1.50 | 56.50 | |
| M 58 x 2.0 | 2.00 | 56.00 | |
| M 58 x 3.0 | 3.00 | 55.00 | |
| M 58 x 4.0 | 4.00 | 54.00 | |
| M 60 x 1.5 | 1.50 | 58.50 | |
| M 60 x 2.0 | 2.00 | 58.00 | |
| M 60 x 3.0 | 3.00 | 57.00 | |
| M 60 x 4.0 | 4.00 | 56.00 | |
| M 62 x 1.5 | 1.50 | 60.50 | |
| M 62 x 2.0 | 2.00 | 60.00 | |
| M 62 x 3.0 | 3.00 | 59.00 | |
| M 62 x 4.0 | 4.00 | 58.00 | |
| M 64 x 1.5 | 1.50 | 62.50 | |
| M 64 x 2.0 | 2.00 | 62.00 | |
| M 64 x 3.0 | 3.00 | 61.00 | |
| M 64 x 4.0 | 4.00 | 60.00 | |
| M 65 x 1.5 | 1.50 | 63.50 | |
| M 65 x 2.0 | 2.00 | 63.00 | |
| M 65 x 3.0 | 3.00 | 62.00 | |
| M 65 x 4.0 | 4.00 | 61.00 | |
| M 68 x 1.5 | 1.50 | 66.50 | |
| M 68 x 2.0 | 2.00 | 66.00 | |
| M 68 x 3.0 | 3.00 | 65.00 | |
| M 68 x 4.0 | 4.00 | 64.00 | |
| M 70 x 1.5 | 1.50 | 68.50 | |
| M 70 x 2.0 | 2.00 | 68.00 | |
| M 70 x 3.0 | 3.00 | 67.00 | |
| M 70 x 4.0 | 4.00 | 66.00 | |
| M 70 x 6.0 | 6.00 | 64.00 | |
| M 72 x 1.5 | 1.50 | 70.50 | |
| M 72 x 2.0 | 2.00 | 70.00 | |
| M 72 x 3.0 | 3.00 | 69.00 | |
| M 72 x 4.0 | 4.00 | 68.00 | |
| M 72 x 6.0 | 6.00 | 66.00 | |
| M 75 x 1.5 | 1.50 | 73.50 | |
| M 75 x 2.0 | 2.00 | 73.00 | |
| M 75 x 3.0 | 3.00 | 72.00 | |
| M 75 x 4.0 | 4.00 | 71.00 | |
| M 75 x 6.0 | 6.00 | 69.00 | |
| M 76 x 1.5 | 1.50 | 74.50 | |
| M 76 x 2.0 | 2.00 | 74.00 | |
| M 76 x 3.0 | 3.00 | 73.00 | |
| M 76 x 4.0 | 4.00 | 72.00 | |
| M 76 x 6.0 | 6.00 | 70.00 | |
| M 80 x 1.5 | 1.50 | 78.50 | |
| M 80 x 2.0 | 2.00 | 78.00 | |
| M 80 x 3.0 | 3.00 | 77.00 | |
| M 80 x 4.0 | 4.00 | 76.00 | |
| M 80 x 6.0 | 6.00 | 74.00 | |
| M 85 x 2.0 | 2.00 | 83.00 | |
| M 85 x 3.0 | 3.00 | 82.00 | |
| M 85 x 4.0 | 4.00 | 81.00 | |
| M 85 x 6.0 | 6.00 | 79.00 | |
| M 90 x 2.0 | 2.00 | 88.00 | |
| M 90 x 3.0 | 3.00 | 87.00 | |
| M 90 x 4.0 | 4.00 | 86.00 | |
| M 90 x 6.0 | 6.00 | 84.00 | |
| M 95 x 2.0 | 2.00 | 93.00 | |
| M 95 x 3.0 | 3.00 | 92.00 | |
| M 95 x 4.0 | 4.00 | 91.00 | |
| M 95 x 6.0 | 6.00 | 89.00 | |
| M 100 x 2.0 | 2.00 | 98.00 | |
| M 100 x 3.0 | 3.00 | 97.00 | |
| M 100 x 4.0 | 4.00 | 96.00 | |
| M 100 x 6.0 | 6.00 | 94.00 |
Related ISO Standards
- ISO 68:1973 ISO general purpose screw threads - Basic profile
- ISO 261:1973 ISO general purpose metric screw threads - General plan
- ISO 262:1973 ISO general purpose metric screw threads - Selected sizes for screws, bolts and nuts
- ISO 724:1993 ISO general-purpose metric screw threads - Basic dimensions
- ISO 965-1:1980 ISO general purpose metric screw threads - Tolerances - Part 1: Principles and basic data
- ISO 965-2:1980 ISO general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality
- ISO 965-3:1980 ISO general purpose metric screw threads - Tolerances - Part 3: Deviations for constructional threads
- ISO 1502:1996 ISO general-purpose metric screw threads - Gauges and gauging
Threads produced to this standard are interchangeable with threads produced to the metric standard ANSI/ASME B1.13M Metric Screw Threads: M Profile.
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