# MachinistCharts

> Free shop-floor reference for bolt tightening torque and tap drill sizes. Every value is calculated from published standards (ISO 898-1, SAE J429, ASME B1.1, ISO 724, ISO 273) and each page shows the working. Updated 2026-10-05.

Cite as: MachinistCharts, https://machinistcharts.com/ . Values are general starting points for steel fasteners in steel; when a manufacturer publishes a torque, theirs takes precedence.

## Charts
- [Bolt torque chart](https://machinistcharts.com/bolt-torque/): metric M4–M36 in class 8.8, 10.9, 12.9 and inch 1/4–1 in SAE grade 2, 5, 8, dry and lubricated
- [Tap drill chart](https://machinistcharts.com/tap-drill/): metric coarse and fine M1.6–M48, UNC and UNF #0–1 in, with thread percentage

## Page patterns
- Metric bolt torque: https://machinistcharts.com/bolt-torque/m10/  (m4, m5, m6, m8, m10, m12, m14, m16, m18, m20, m22, m24, m27, m30, m33, m36)
- Inch bolt torque: https://machinistcharts.com/bolt-torque/1-2-inch/  (1-4, 5-16, 3-8, 7-16, 1-2, 9-16, 5-8, 3-4, 7-8, 1)
- Metric tap drill: https://machinistcharts.com/tap-drill/m8/ (coarse), https://machinistcharts.com/tap-drill/m10x1-25/ (fine)
- Inch tap drill: https://machinistcharts.com/tap-drill/1-4-20/, https://machinistcharts.com/tap-drill/10-32/
- Every page has a Markdown version: append index.md, e.g. https://machinistcharts.com/bolt-torque/m10/index.md

## Data (CC BY 4.0)
- [Bolt torque CSV](https://machinistcharts.com/data/bolt-torque.csv) and [JSON](https://machinistcharts.com/data/bolt-torque.json): 108 rows
- [Tap drill CSV](https://machinistcharts.com/data/tap-drill.csv) and [JSON](https://machinistcharts.com/data/tap-drill.json): 80 rows
- [Everything in one file](https://machinistcharts.com/llms-full.txt)

## Calculators (accept URL parameters)
- [Bolt torque calculator](https://machinistcharts.com/calculators/bolt-torque/): ?sys=metric|inch&size=M12|1/2-13&grade=8.8|10.9|12.9|2|5|8&k=0.20&pct=75&unit=nm|ftlb|inlb
- [Thread percentage calculator](https://machinistcharts.com/calculators/thread-percentage/): ?unit=mm|in&d=8&p=1.25&drill=6.8&want=75 (p is pitch in mm, or TPI when unit=in)

## Method
- Torque: T = K x F x d. F (target clamp load) = 75 % of proof load. Proof load = proof stress x tensile stress area. Proof stress: ISO 898-1 (8.8: 580 MPa up to M16, 600 MPa above; 10.9: 830 MPa; 12.9: 970 MPa), SAE J429 (grade 2: 55 ksi to 3/4 in, 33 ksi above; grade 5: 85 ksi to 1 in; grade 8: 120 ksi). Stress area: metric As = pi/4 x (d - 0.9382 p)^2; inch As = 0.7854 x (D - 0.9743/n)^2. K = 0.20 dry, 0.15 lubricated.
- Tap drills: Cut-tap drill sizes. Thread percent = (D - drill) / (0.01299 x P), equivalent to 76.98 x (D - drill) / P for metric; for inch threads P = 1/TPI.

## Optional
- [About the data](https://machinistcharts.com/about/)
- [Disclaimer](https://machinistcharts.com/disclaimer/)


---

# Bolt torque chart

Dry tightening torque for coarse-thread steel bolts at 75 % of proof load. Data: https://machinistcharts.com/data/bolt-torque.csv

## Metric bolts, dry torque (N·m)

| Size | Class 8.8 | Class 10.9 | Class 12.9 | Wrench |
|---|---|---|---|---|
| M4 x 0.7 | 3.1 | 4.4 | 5.1 | 7 mm |
| M5 x 0.8 | 6.2 | 8.8 | 10 | 8 mm |
| M6 x 1 | 11 | 15 | 18 | 10 mm |
| M8 x 1.25 | 25 | 36 | 43 | 13 mm |
| M10 x 1.5 | 50 | 72 | 84 | 16 mm |
| M12 x 1.75 | 88 | 126 | 147 | 18 mm |
| M14 x 2 | 141 | 201 | 235 | 21 mm |
| M16 x 2 | 218 | 312 | 365 | 24 mm |
| M18 x 2.5 | 312 | 431 | 504 | 27 mm |
| M20 x 2.5 | 441 | 610 | 712 | 30 mm |
| M22 x 2.5 | 601 | 831 | 971 | 34 mm |
| M24 x 3 | 761 | 1,053 | 1,231 | 36 mm |
| M27 x 3 | 1,116 | 1,544 | 1,805 | 41 mm |
| M30 x 3.5 | 1,514 | 2,094 | 2,447 | 46 mm |
| M33 x 3.5 | 2,060 | 2,849 | 3,330 | 50 mm |
| M36 x 4 | 2,646 | 3,661 | 4,278 | 55 mm |

## Inch bolts, UNC, dry torque (ft-lb)

| Size | Grade 2 | Grade 5 | Grade 8 | Wrench |
|---|---|---|---|---|
| 1/4-20 | 5.5 | 8.5 | 12 | 7/16 in |
| 5/16-18 | 11 | 17 | 25 | 1/2 in |
| 3/8-16 | 20 | 31 | 44 | 9/16 in |
| 7/16-14 | 32 | 49 | 70 | 5/8 in |
| 1/2-13 | 49 | 75 | 106 | 3/4 in |
| 9/16-12 | 70 | 109 | 154 | 13/16 in |
| 5/8-11 | 97 | 150 | 212 | 15/16 in |
| 3/4-10 | 172 | 267 | 376 | 1-1/8 in |
| 7/8-9 | 167 | 429 | 606 | 1-5/16 in |
| 1-8 | 250 | 644 | 909 | 1-1/2 in |

## Method

T = K x F x d. F (target clamp load) = 75 % of proof load. Proof load = proof stress x tensile stress area. Proof stress: ISO 898-1 (8.8: 580 MPa up to M16, 600 MPa above; 10.9: 830 MPa; 12.9: 970 MPa), SAE J429 (grade 2: 55 ksi to 3/4 in, 33 ksi above; grade 5: 85 ksi to 1 in; grade 8: 120 ksi). Stress area: metric As = pi/4 x (d - 0.9382 p)^2; inch As = 0.7854 x (D - 0.9743/n)^2. K = 0.20 dry, 0.15 lubricated.

## All torque rows

| Thread | Grade | Dry N·m | Dry ft-lb | Lubricated N·m | Lubricated ft-lb |
|---|---|---|---|---|---|
| M4x0.7 | class 8.8 | 3.1 | 2.3 | 2.3 | 1.7 |
| M4x0.7 | class 10.9 | 4.4 | 3.2 | 3.3 | 2.4 |
| M4x0.7 | class 12.9 | 5.1 | 3.8 | 3.8 | 2.8 |
| M5x0.8 | class 8.8 | 6.2 | 4.6 | 4.6 | 3.4 |
| M5x0.8 | class 10.9 | 8.8 | 6.5 | 6.6 | 4.9 |
| M5x0.8 | class 12.9 | 10.3 | 7.6 | 7.7 | 5.7 |
| M6x1 | class 8.8 | 10.5 | 7.7 | 7.9 | 5.8 |
| M6x1 | class 10.9 | 15.0 | 11.1 | 11.3 | 8.3 |
| M6x1 | class 12.9 | 17.6 | 13.0 | 13.2 | 9.7 |
| M8x1.25 | class 8.8 | 25.5 | 18.8 | 19.1 | 14.1 |
| M8x1.25 | class 10.9 | 36.5 | 26.9 | 27.3 | 20.2 |
| M8x1.25 | class 12.9 | 42.6 | 31.4 | 32.0 | 23.6 |
| M10x1.5 | class 8.8 | 50.5 | 37.2 | 37.8 | 27.9 |
| M10x1.5 | class 10.9 | 72.2 | 53.2 | 54.1 | 39.9 |
| M10x1.5 | class 12.9 | 84.4 | 62.2 | 63.3 | 46.7 |
| M12x1.75 | class 8.8 | 88.0 | 64.9 | 66.0 | 48.7 |
| M12x1.75 | class 10.9 | 125.9 | 92.9 | 94.4 | 69.6 |
| M12x1.75 | class 12.9 | 147.1 | 108.5 | 110.3 | 81.4 |
| M14x2 | class 8.8 | 140.6 | 103.7 | 105.5 | 77.8 |
| M14x2 | class 10.9 | 201.2 | 148.4 | 150.9 | 111.3 |
| M14x2 | class 12.9 | 235.1 | 173.4 | 176.4 | 130.1 |
| M16x2 | class 8.8 | 218.1 | 160.8 | 163.6 | 120.6 |
| M16x2 | class 10.9 | 312.1 | 230.2 | 234.1 | 172.6 |
| M16x2 | class 12.9 | 364.7 | 269.0 | 273.5 | 201.8 |
| M18x2.5 | class 8.8 | 311.8 | 230.0 | 233.9 | 172.5 |
| M18x2.5 | class 10.9 | 431.3 | 318.1 | 323.5 | 238.6 |
| M18x2.5 | class 12.9 | 504.1 | 371.8 | 378.1 | 278.8 |
| M20x2.5 | class 8.8 | 440.6 | 325.0 | 330.5 | 243.7 |
| M20x2.5 | class 10.9 | 609.5 | 449.6 | 457.2 | 337.2 |
| M20x2.5 | class 12.9 | 712.4 | 525.4 | 534.3 | 394.1 |
| M22x2.5 | class 8.8 | 600.7 | 443.1 | 450.5 | 332.3 |
| M22x2.5 | class 10.9 | 831.0 | 612.9 | 623.3 | 459.7 |
| M22x2.5 | class 12.9 | 971.2 | 716.3 | 728.4 | 537.2 |
| M24x3 | class 8.8 | 761.4 | 561.6 | 571.1 | 421.2 |
| M24x3 | class 10.9 | 1053.3 | 776.9 | 790.0 | 582.6 |
| M24x3 | class 12.9 | 1230.9 | 907.9 | 923.2 | 680.9 |
| M27x3 | class 8.8 | 1116.4 | 823.4 | 837.3 | 617.5 |
| M27x3 | class 10.9 | 1544.3 | 1139.0 | 1158.2 | 854.3 |
| M27x3 | class 12.9 | 1804.8 | 1331.1 | 1353.6 | 998.4 |
| M30x3.5 | class 8.8 | 1513.6 | 1116.4 | 1135.2 | 837.3 |
| M30x3.5 | class 10.9 | 2093.8 | 1544.3 | 1570.3 | 1158.2 |
| M30x3.5 | class 12.9 | 2447.0 | 1804.8 | 1835.2 | 1353.6 |
| M33x3.5 | class 8.8 | 2059.9 | 1519.3 | 1544.9 | 1139.5 |
| M33x3.5 | class 10.9 | 2849.5 | 2101.7 | 2137.1 | 1576.2 |
| M33x3.5 | class 12.9 | 3330.1 | 2456.1 | 2497.6 | 1842.1 |
| M36x4 | class 8.8 | 2646.2 | 1951.7 | 1984.6 | 1463.8 |
| M36x4 | class 10.9 | 3660.5 | 2699.9 | 2745.4 | 2024.9 |
| M36x4 | class 12.9 | 4278.0 | 3155.3 | 3208.5 | 2366.5 |
| 1/4-20 | SAE grade 2 | 7.4 | 5.5 | 5.6 | 4.1 |
| 1/4-20 | SAE grade 5 | 11.5 | 8.5 | 8.6 | 6.3 |
| 1/4-20 | SAE grade 8 | 16.2 | 11.9 | 12.1 | 8.9 |
| 1/4-28 | SAE grade 2 | 8.5 | 6.3 | 6.4 | 4.7 |
| 1/4-28 | SAE grade 5 | 13.1 | 9.7 | 9.8 | 7.2 |
| 1/4-28 | SAE grade 8 | 18.5 | 13.6 | 13.9 | 10.2 |
| 5/16-18 | SAE grade 2 | 15.3 | 11.3 | 11.5 | 8.4 |
| 5/16-18 | SAE grade 5 | 23.6 | 17.4 | 17.7 | 13.1 |
| 5/16-18 | SAE grade 8 | 33.3 | 24.6 | 25.0 | 18.4 |
| 5/16-24 | SAE grade 2 | 16.9 | 12.5 | 12.7 | 9.4 |
| 5/16-24 | SAE grade 5 | 26.1 | 19.3 | 19.6 | 14.5 |
| 5/16-24 | SAE grade 8 | 36.9 | 27.2 | 27.7 | 20.4 |
| 3/8-16 | SAE grade 2 | 27.1 | 20.0 | 20.3 | 15.0 |
| 3/8-16 | SAE grade 5 | 41.9 | 30.9 | 31.4 | 23.2 |
| 3/8-16 | SAE grade 8 | 59.1 | 43.6 | 44.3 | 32.7 |
| 3/8-24 | SAE grade 2 | 30.7 | 22.6 | 23.0 | 17.0 |
| 3/8-24 | SAE grade 5 | 47.4 | 35.0 | 35.6 | 26.2 |
| 3/8-24 | SAE grade 8 | 67.0 | 49.4 | 50.2 | 37.1 |
| 7/16-14 | SAE grade 2 | 43.4 | 32.0 | 32.5 | 24.0 |
| 7/16-14 | SAE grade 5 | 67.0 | 49.4 | 50.3 | 37.1 |
| 7/16-14 | SAE grade 8 | 94.6 | 69.8 | 70.9 | 52.3 |
| 7/16-20 | SAE grade 2 | 48.4 | 35.7 | 36.3 | 26.8 |
| 7/16-20 | SAE grade 5 | 74.8 | 55.2 | 56.1 | 41.4 |
| 7/16-20 | SAE grade 8 | 105.6 | 77.9 | 79.2 | 58.4 |
| 1/2-13 | SAE grade 2 | 66.1 | 48.8 | 49.6 | 36.6 |
| 1/2-13 | SAE grade 5 | 102.2 | 75.4 | 76.7 | 56.5 |
| 1/2-13 | SAE grade 8 | 144.3 | 106.4 | 108.2 | 79.8 |
| 1/2-20 | SAE grade 2 | 74.5 | 55.0 | 55.9 | 41.2 |
| 1/2-20 | SAE grade 5 | 115.2 | 85.0 | 86.4 | 63.7 |
| 1/2-20 | SAE grade 8 | 162.7 | 120.0 | 122.0 | 90.0 |
| 9/16-12 | SAE grade 2 | 95.4 | 70.4 | 71.5 | 52.8 |
| 9/16-12 | SAE grade 5 | 147.4 | 108.7 | 110.6 | 81.6 |
| 9/16-12 | SAE grade 8 | 208.1 | 153.5 | 156.1 | 115.1 |
| 9/16-18 | SAE grade 2 | 106.4 | 78.5 | 79.8 | 58.9 |
| 9/16-18 | SAE grade 5 | 164.5 | 121.3 | 123.4 | 91.0 |
| 9/16-18 | SAE grade 8 | 232.2 | 171.3 | 174.2 | 128.4 |
| 5/8-11 | SAE grade 2 | 131.7 | 97.1 | 98.7 | 72.8 |
| 5/8-11 | SAE grade 5 | 203.5 | 150.1 | 152.6 | 112.6 |
| 5/8-11 | SAE grade 8 | 287.3 | 211.9 | 215.5 | 158.9 |
| 5/8-18 | SAE grade 2 | 149.1 | 110.0 | 111.8 | 82.5 |
| 5/8-18 | SAE grade 5 | 230.5 | 170.0 | 172.8 | 127.5 |
| 5/8-18 | SAE grade 8 | 325.3 | 240.0 | 244.0 | 180.0 |
| 3/4-10 | SAE grade 2 | 233.8 | 172.5 | 175.4 | 129.3 |
| 3/4-10 | SAE grade 5 | 361.4 | 266.5 | 271.0 | 199.9 |
| 3/4-10 | SAE grade 8 | 510.2 | 376.3 | 382.6 | 282.2 |
| 3/4-16 | SAE grade 2 | 260.7 | 192.3 | 195.6 | 144.2 |
| 3/4-16 | SAE grade 5 | 403.0 | 297.2 | 302.2 | 222.9 |
| 3/4-16 | SAE grade 8 | 568.9 | 419.6 | 426.7 | 314.7 |
| 7/8-9 | SAE grade 2 | 226.0 | 166.7 | 169.5 | 125.0 |
| 7/8-9 | SAE grade 5 | 582.0 | 429.3 | 436.5 | 322.0 |
| 7/8-9 | SAE grade 8 | 821.7 | 606.0 | 616.2 | 454.5 |
| 7/8-14 | SAE grade 2 | 249.3 | 183.9 | 187.0 | 137.9 |
| 7/8-14 | SAE grade 5 | 642.2 | 473.7 | 481.6 | 355.2 |
| 7/8-14 | SAE grade 8 | 906.6 | 668.7 | 680.0 | 501.5 |
| 1-8 | SAE grade 2 | 338.8 | 249.9 | 254.1 | 187.4 |
| 1-8 | SAE grade 5 | 872.6 | 643.6 | 654.5 | 482.7 |
| 1-8 | SAE grade 8 | 1231.9 | 908.6 | 923.9 | 681.5 |
| 1-12 | SAE grade 2 | 370.8 | 273.5 | 278.1 | 205.1 |
| 1-12 | SAE grade 5 | 955.1 | 704.5 | 716.4 | 528.4 |
| 1-12 | SAE grade 8 | 1348.4 | 994.6 | 1011.3 | 745.9 |

---

# Tap drill size chart

Standard cut-tap drill sizes with thread percentage. Data: https://machinistcharts.com/data/tap-drill.csv

| Thread | Series | Tap drill | Drill mm | Drill in | Thread % |
|---|---|---|---|---|---|
| M1.6 x 0.35 | metric coarse | 1.25 mm | 1.25 | 0.0492 | 77 |
| M2 x 0.4 | metric coarse | 1.6 mm | 1.6 | 0.063 | 77 |
| M2.5 x 0.45 | metric coarse | 2.05 mm | 2.05 | 0.0807 | 77 |
| M3 x 0.5 | metric coarse | 2.5 mm | 2.5 | 0.0984 | 77 |
| M3.5 x 0.6 | metric coarse | 2.9 mm | 2.9 | 0.1142 | 77 |
| M4 x 0.7 | metric coarse | 3.3 mm | 3.3 | 0.1299 | 77 |
| M5 x 0.8 | metric coarse | 4.2 mm | 4.2 | 0.1654 | 77 |
| M6 x 1 | metric coarse | 5 mm | 5.0 | 0.1969 | 77 |
| M8 x 1.25 | metric coarse | 6.8 mm | 6.8 | 0.2677 | 74 |
| M10 x 1.5 | metric coarse | 8.5 mm | 8.5 | 0.3346 | 77 |
| M12 x 1.75 | metric coarse | 10.2 mm | 10.2 | 0.4016 | 79 |
| M14 x 2 | metric coarse | 12 mm | 12.0 | 0.4724 | 77 |
| M16 x 2 | metric coarse | 14 mm | 14.0 | 0.5512 | 77 |
| M18 x 2.5 | metric coarse | 15.5 mm | 15.5 | 0.6102 | 77 |
| M20 x 2.5 | metric coarse | 17.5 mm | 17.5 | 0.689 | 77 |
| M22 x 2.5 | metric coarse | 19.5 mm | 19.5 | 0.7677 | 77 |
| M24 x 3 | metric coarse | 21 mm | 21.0 | 0.8268 | 77 |
| M27 x 3 | metric coarse | 24 mm | 24.0 | 0.9449 | 77 |
| M30 x 3.5 | metric coarse | 26.5 mm | 26.5 | 1.0433 | 77 |
| M33 x 3.5 | metric coarse | 29.5 mm | 29.5 | 1.1614 | 77 |
| M36 x 4 | metric coarse | 32 mm | 32.0 | 1.2598 | 77 |
| M39 x 4 | metric coarse | 35 mm | 35.0 | 1.378 | 77 |
| M42 x 4.5 | metric coarse | 37.5 mm | 37.5 | 1.4764 | 77 |
| M48 x 5 | metric coarse | 43 mm | 43.0 | 1.6929 | 77 |
| M3 x 0.35 | metric fine | 2.65 mm | 2.65 | 0.1043 | 77 |
| M4 x 0.5 | metric fine | 3.5 mm | 3.5 | 0.1378 | 77 |
| M5 x 0.5 | metric fine | 4.5 mm | 4.5 | 0.1772 | 77 |
| M6 x 0.75 | metric fine | 5.2 mm | 5.2 | 0.2047 | 82 |
| M8 x 1 | metric fine | 7 mm | 7.0 | 0.2756 | 77 |
| M10 x 1 | metric fine | 9 mm | 9.0 | 0.3543 | 77 |
| M10 x 1.25 | metric fine | 8.8 mm | 8.8 | 0.3465 | 74 |
| M12 x 1.25 | metric fine | 10.8 mm | 10.8 | 0.4252 | 74 |
| M12 x 1.5 | metric fine | 10.5 mm | 10.5 | 0.4134 | 77 |
| M14 x 1.5 | metric fine | 12.5 mm | 12.5 | 0.4921 | 77 |
| M16 x 1.5 | metric fine | 14.5 mm | 14.5 | 0.5709 | 77 |
| M18 x 1.5 | metric fine | 16.5 mm | 16.5 | 0.6496 | 77 |
| M20 x 1.5 | metric fine | 18.5 mm | 18.5 | 0.7283 | 77 |
| M22 x 1.5 | metric fine | 20.5 mm | 20.5 | 0.8071 | 77 |
| M24 x 2 | metric fine | 22 mm | 22.0 | 0.8661 | 77 |
| M27 x 2 | metric fine | 25 mm | 25.0 | 0.9843 | 77 |
| M30 x 2 | metric fine | 28 mm | 28.0 | 1.1024 | 77 |
| #1-64 | UNC | #53 | 1.51 | 0.0595 | 67 |
| #2-56 | UNC | #50 | 1.78 | 0.07 | 69 |
| #3-48 | UNC | #47 | 1.99 | 0.0785 | 76 |
| #4-40 | UNC | #43 | 2.26 | 0.089 | 71 |
| #5-40 | UNC | #38 | 2.58 | 0.1015 | 72 |
| #6-32 | UNC | #36 | 2.71 | 0.1065 | 78 |
| #8-32 | UNC | #29 | 3.45 | 0.136 | 69 |
| #10-24 | UNC | #25 | 3.8 | 0.1495 | 75 |
| #12-24 | UNC | #16 | 4.5 | 0.177 | 72 |
| 1/4-20 | UNC | #7 | 5.11 | 0.201 | 75 |
| 5/16-18 | UNC | F | 6.53 | 0.257 | 77 |
| 3/8-16 | UNC | 5/16 | 7.94 | 0.3125 | 77 |
| 7/16-14 | UNC | U | 9.35 | 0.368 | 75 |
| 1/2-13 | UNC | 27/64 | 10.72 | 0.4219 | 78 |
| 9/16-12 | UNC | 31/64 | 12.3 | 0.4844 | 72 |
| 5/8-11 | UNC | 17/32 | 13.5 | 0.5313 | 79 |
| 3/4-10 | UNC | 21/32 | 16.67 | 0.6563 | 72 |
| 7/8-9 | UNC | 49/64 | 19.45 | 0.7656 | 76 |
| 1-8 | UNC | 7/8 | 22.22 | 0.875 | 77 |
| #0-80 | UNF | 3/64 | 1.19 | 0.0469 | 81 |
| #1-72 | UNF | #53 | 1.51 | 0.0595 | 75 |
| #2-64 | UNF | #50 | 1.78 | 0.07 | 79 |
| #3-56 | UNF | #45 | 2.08 | 0.082 | 73 |
| #4-48 | UNF | #42 | 2.37 | 0.0935 | 68 |
| #5-44 | UNF | #37 | 2.64 | 0.104 | 71 |
| #6-40 | UNF | #33 | 2.87 | 0.113 | 77 |
| #8-36 | UNF | #29 | 3.45 | 0.136 | 78 |
| #10-32 | UNF | #21 | 4.04 | 0.159 | 76 |
| #12-28 | UNF | #14 | 4.62 | 0.182 | 73 |
| 1/4-28 | UNF | #3 | 5.41 | 0.213 | 80 |
| 5/16-24 | UNF | I | 6.91 | 0.272 | 75 |
| 3/8-24 | UNF | Q | 8.43 | 0.332 | 79 |
| 7/16-20 | UNF | 25/64 | 9.92 | 0.3906 | 72 |
| 1/2-20 | UNF | 29/64 | 11.51 | 0.4531 | 72 |
| 9/16-18 | UNF | 33/64 | 13.1 | 0.5156 | 65 |
| 5/8-18 | UNF | 37/64 | 14.68 | 0.5781 | 65 |
| 3/4-16 | UNF | 11/16 | 17.46 | 0.6875 | 77 |
| 7/8-14 | UNF | 13/16 | 20.64 | 0.8125 | 67 |
| 1-12 | UNF | 59/64 | 23.42 | 0.9219 | 72 |

## Method

Cut-tap drill sizes. Thread percent = (D - drill) / (0.01299 x P), equivalent to 76.98 x (D - drill) / P for metric; for inch threads P = 1/TPI.