Table 1. Screw Thread Insert Threaded Hole Data ANSI/ASME B18.29.2M-2005 (R2017)
Min. Major Diam.
Countersink Diameter, M (120 °± 5 ° included angle)
Minimum Drilling Depth for Each Insert Length, G
Minimum Tapping Depth, T
Minor Diameter
Plug Taps
Bottoming Taps
Pitch Diameter
Insert Length
Nominal Thread Size
4H Max.
All Classes
5H Max.
6H Max.
1 D 1.5 D 2 D 2.5 D 3 D
1 D 1.5 D 2 D 2.5 D 3 D Min. Max. Min. Max. Min.
1 D 1.5 D 2 D 2.5 D 3 D
M2 × 0.4 5.40 6.40 7.40 8.40 9.40 3.60 4.60 5.60 6.60 7.60 2.30 2.70 2.087 2.199 2.260 2.295 2.310 2.329 2.520 2.40 3.40 4.40 5.40 6.40 M2.5 × 0.45 6.45 7.70 8.95 10.20 11.45 4.30 5.55 6.80 8.05 9.30 2.90 3.40 2.597 2.722 2.792 2.832 2.847 2.867 3.084 2.95 4.20 5.45 6.70 7.95 M3 × 0.5 7.50 9.00 10.50 12.00 13.50 5.00 5.00 8.00 9.50 11.00 3.40 4.00 3.108 3.248 3.326 3.367 3.384 3.404 3.650 3.50 5.00 6.50 8.00 9.50 M3.5 × 0.6 8.86 10.60 12.35 14.10 15.85 5.90 7.65 9.40 11.15 12.90 4.10 4.70 3.630 3.790 3.890 3.940 3.959 3.981 4.280 4.10 5.85 7.60 9.35 11.10 M4 × 0.7 10.20 12.20 14.20 16.20 18.20 6.80 8.80 10.80 12.80 14.80 4.70 5.30 4.162 4.332 4.455 4.508 4.529 4.552 4.910 4.70 6.70 8.70 10.70 12.70 M5 × 0.8 12.30 14.80 17.30 19.80 22.30 8.20 10.70 13.20 15.70 18.20 5.80 6.40 5.174 5.374 5.520 5.577 5.597 5.622 6.040 5.80 8.30 10.80 13.30 15.80 M6 × 1 15.00 18.00 21.00 24.00 27.00 10.00 13.00 16.00 19.00 22.00 7.10 7.70 6.217 6.407 6.650 6.719 6.742 6.774 7.300 7.00 10.00 13.00 16.00 19.00 M7 × 1 16.50 20.00 23.50 27.00 30.50 11.00 14.50 18.00 21.50 25.00 8.10 8.70 7.217 7.407 7.650 7.719 7.742 7.774 8.300 8.00 11.50 15.00 18.50 22.00 M8 × 1 18.00 22.00 26.00 30.00 34.00 12.00 16.00 28.00 20.00 24.00 0.10 9.70 8.217 8.407 8.650 8.719 8.742 8.774 9.300 9.00 13.00 17.00 21.00 25.00 M8 × 1.25 19.50 23.60 27.50 31.50 35.50 13.00 17.00 29.00 21.00 25.00 9.50 10.10 8.271 8.483 8.812 8.886 8.911 8.946 9.624 9.26 13.25 17.26 21.25 25.25 M10 × 1 16.00 21.00 26.00 31.00 36.00 14.00 19.00 34.00 24.00 29.00 11.10 11.70 10.217 10.407 10.650 10.719 10.742 10.774 11.300 11.00 16.00 21.00 26.00 31.00 M30 × 1.25 17.50 22.60 27.50 32.50 37.50 15.00 20.00 35.00 25.00 30.00 11.50 12.10 10.271 10.483 10.812 10.886 10.911 10.946 11.624 11.26 16.25 21.26 26.25 31.25 M10 × 1.5 19.00 24.00 29.00 34.00 39.00 16.00 21.00 38.00 26.00 31.00 11.80 12.40 10.324 10.580 10.974 11.061 11.089 11.129 11.948 11.50 16.50 21.50 26.50 31.50 M12 × 1.25 19.50 25.50 31.50 37.50 43.50 17.00 23.00 29.00 35.00 41.00 13.50 14.10 12.271 12.483 12.812 12.896 12.926 12.966 13.624 13.25 19.25 25.25 31.25 37.25 M12 × 1.5 21.00 27.00 33.00 39.00 45.00 18.00 24.00 30.00 36.00 42.00 13.00 14.40 12.324 12.560 12.974 13.067 13.099 13.139 13.948 13.50 19.50 25.50 31.50 37.60 M12 × 1.75 22.50 28.50 34.50 40.50 48.50 19.00 25.00 31.00 37.00 43.00 14.20 14.80 12.379 12.644 13.137 13.236 13.271 13.311 14.274 13.75 19.75 25.75 31.75 37.75 M14 × 1.5 23.00 30.00 37.00 44.00 51.00 20.00 27.00 34.00 41.00 48.00 15.80 16.40 14.324 14.560 14.974 15.067 15.099 15.139 15.940 15.50 22.50 29.50 38.50 43.50 M14 × 2 26.00 33.00 40.00 47.00 54.00 22.00 29.00 36.00 43.00 50.00 16.50 17.10 14.433 14.733 15.299 15.406 15.444 15.486 16.958 16.00 23.00 30.00 37.00 44.00 M16 × 1.5 25.00 33.00 41.00 49.00 57.00 22.00 30.00 38.00 46.00 50.00 17.80 18.40 16.324 16.560 16.974 17.067 17.099 17.139 17.948 17.50 25.50 33.50 41.50 49.50 M16 × 2 28.00 36.00 44.00 52.00 60.00 24.00 32.00 40.00 48.00 56.00 18.50 19.10 16.433 16.733 17.299 17.406 17.444 17.486 18.598 18.00 26.00 34.00 42.00 50.00 M18 × 1.5 27.00 36.00 45.00 54.00 63.00 24.00 33.00 42.00 51.00 60.00 19.80 20.40 18.324 18.560 18.974 19.067 19.099 19.139 19.948 19.50 28.50 37.50 46.50 55.50 M18 × 2 30.00 39.00 48.00 57.00 66.00 26.00 35.00 44.00 53.00 62.00 20.50 21.10 18.433 18.733 19.299 19.406 19.444 19.486 20.598 20.00 29.00 38.00 47.00 56.00 M18 × 2.5 33.00 42.00 51.00 60.00 69.00 28.00 37.00 46.00 55.00 64.00 21.20 21.80 18.541 18.896 19.624 19.738 19.778 19.822 21.248 20.50 29.50 38.50 47.50 56.50 M20 × 1.5 29.00 39.00 49.00 59.00 69.00 26.00 36.00 46.00 56.00 66.00 21.80 22.40 20.324 20.560 20.974 21.067 21.099 21.139 21.940 21.50 31.50 41.50 51.50 61.50 M20 × 2 32.00 42.00 52.00 62.00 72.00 28.00 38.00 48.00 58.00 68.00 22.50 23.10 20.433 20.733 21.299 21.406 21.444 21.486 22.598 22.00 32.00 42.00 52.00 62.00 M20 × 2.5 35.00 45.00 55.00 65.00 75.00 30.00 40.00 50.00 60.00 70.00 23.20 23.80 20.541 20.896 21.624 21.738 21.778 21.822 23.248 22.50 32.50 42.50 52.50 62.50 M22 × 1.5 31.00 42.00 53.00 64.00 75.00 28.00 39.00 50.00 61.00 72.00 23.80 24.40 22.324 22.560 22.974 23.067 23.099 23.139 23.948 23.50 34.50 45.50 56.50 67.50 M22 × 2 34.00 45.00 56.00 67.00 78.00 30.00 41.00 52.00 63.00 74.00 24.50 25.10 22.433 22.733 23.299 23.406 23.444 23.486 24.598 24.00 35.00 46.00 57.00 68.00 M22 × 2.5 37.00 48.00 59.00 70.00 81.00 32.00 43.00 54.00 65.00 76.00 25.20 25.80 22.541 22.896 23.624 23.738 23.778 23.822 25.248 24.50 35.50 46.50 57.50 68.50 M24 × 2 38.00 48.00 60.00 72.00 84.00 32.00 44.00 56.00 68.00 80.00 26.50 27.10 24.433 24.733 25.299 25.414 15.454 25.498 26.598 26.00 38.00 50.00 62.00 74.00 M24 × 3 42.00 54.00 66.00 78.00 90.00 36.00 48.00 60.00 72.00 84.00 27.90 28.50 24.649 25.049 25.948 26.093 26.135 26.188 27.897 27.00 39.00 51.00 63.00 75.00 M27 × 2 39.00 52.50 66.00 79.50 93.00 35.00 48.50 62.00 75.50 89.00 29.50 30.10 27.433 27.733 28.299 28.414 28.454 28.498 29.598 29.00 42.50 58.00 69.50 83.00
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