British Standard Whitworth Coarse Thread Series (parallel, cylindrical) In GB most common Thread. Corresponds to the Metric Thread in its type of use.
UNEF – 8 Threads Per Inch | |||
---|---|---|---|
Nominal Dia. | TPI | Pitch | Tap Size |
1-1/16” | 8 | 3.175 | 24.00 |
1-1/8” | 8 | 3.175 | 25.50 |
1-3/16” | 8 | 3.175 | 27.20 |
1-1/4” | 8 | 3.175 | 28.80 |
1-5/16” | 8 | 3.175 | 30.30 |
1-3/8” | 8 | 3.175 | 31.90 |
1-7/16” | 8 | 3.175 | 33.50 |
1-1/2” | 8 | 3.175 | 35.10 |
1-9/16” | 8 | 3.175 | 36.70 |
1-5/8” | 8 | 3.175 | 38.30 |
1-11/16” | 8 | 3.175 | 39.90 |
1-3/4” | 8 | 3.175 | 41.40 |
1-13/16” | 8 | 3.175 | 43.00 |
1-7/8” | 8 | 3.175 | 44.60 |
1-15/16” | 8 | 3.175 | 46.20 |
2” | 8 | 3.175 | 47.80 |
2-1/8” | 8 | 3.175 | 51.00 |
2-1/4” | 8 | 3.175 | 54.10 |
2-3/8” | 8 | 3.175 | 57.30 |
2-1/2” | 8 | 3.175 | 60.50 |
2-5/8” | 8 | 3.175 | 64.70 |
2-3/4” | 8 | 3.175 | 66.80 |
2-7/8” | 8 | 3.175 | 70.00 |
3” | 8 | 3.175 | 73.20 |
3-1/8” | 8 | 3.175 | 76.40 |
3-1/4” | 8 | 3.175 | 79.50 |
3-3/8” | 8 | 3.175 | 82.70 |
3-1/2” | 8 | 3.175 | 85.90 |
3-5/8” | 8 | 3.175 | 89.00 |
3-3/4” | 8 | 3.175 | 92.30 |
3-7/8” | 8 | 3.175 | 95.40 |
4” | 8 | 3.175 | 98.60 |
UNEF – 12 Threads Per Inch | |||
Nominal Dia. | TPI | Pitch | Tap Size |
5/8” | 12 | 2.117 | 13.90 |
11/16” | 12 | 2.117 | 15.50 |
3/4” | 12 | 2.117 | 17.00 |
13/16” | 12 | 2.117 | 18.60 |
7/8” | 12 | 2.117 | 20.20 |
15/16” | 12 | 2.117 | 21.80 |
1-1/16” | 12 | 2.117 | 25.00 |
1-3/16” | 12 | 2.117 | 28.20 |
1-5/16” | 12 | 2.117 | 31.30 |
1-7/16” | 12 | 2.117 | 34.50 |
1-9/16” | 12 | 2.117 | 37.70 |
1-5/8” | 12 | 2.117 | 39.30 |
1-11/16” | 12 | 2.117 | 40.85 |
1-3/4” | 12 | 2.117 | 42.40 |
1-13/16” | 12 | 2.117 | 44.00 |
1-7/8” | 12 | 2.117 | 45.60 |
1-15/16” | 12 | 2.117 | 47.20 |
2” | 12 | 2.117 | 48.80 |
2-1/8” | 12 | 2.117 | 52.00 |
2-1/4” | 12 | 2.117 | 55.10 |
2-3/8” | 12 | 2.117 | 58.30 |
2-1/2” | 12 | 2.117 | 61.50 |
2-5/8” | 12 | 2.117 | 64.70 |
2-3/4” | 12 | 2.117 | 67.80 |
2-7/8” | 12 | 2.117 | 71.00 |
3” | 12 | 2.117 | 74.20 |
3-1/8” | 12 | 2.117 | 77.40 |
3-1/4” | 12 | 2.117 | 80.50 |
3-3/8” | 12 | 2.117 | 83.70 |
3-1/2” | 12 | 2.117 | 86.90 |
3-5/8” | 12 | 2.117 | 90.10 |
3-3/4” | 12 | 2.117 | 93.25 |
3-7/8” | 12 | 2.117 | 96.40 |
4” | 12 | 2.117 | 99.60 |
4-1/8” | 12 | 2.117 | 102.80 |
4-1/4” | 12 | 2.117 | 105.90 |
4-3/8” | 12 | 2.117 | 109.10 |
4-1/2” | 12 | 2.117 | 112.30 |
4-5/8” | 12 | 2.117 | 115.50 |
4-3/4” | 12 | 2.117 | 118.70 |
4-7/8” | 12 | 2.117 | 121.70 |
5” | 12 | 2.117 | 125.00 |
5-1/8” | 12 | 2.117 | 128.20 |
5-1/4” | 12 | 2.117 | 131.40 |
5-3/8” | 12 | 2.117 | 134.50 |
5-1/2” | 12 | 2.117 | 137.70 |
5-5/8” | 12 | 2.117 | 140.90 |
5-3/4” | 12 | 2.117 | 144.00 |
6” | 12 | 2.117 | 150.40 |
UNEF – 16 Threads Per Inch | |||
Nominal Dia. | TPI | Pitch | Tap Size |
7/16” | 16 | 1.587 | 9.58 |
1/2” | 16 | 1.587 | 11.20 |
9/16” | 16 | 1.587 | 12.80 |
5/8” | 16 | 1.587 | 14.40 |
11/16” | 16 | 1.587 | 16.00 |
13/16” | 16 | 1.587 | 19.10 |
7/8” | 16 | 1.587 | 20.70 |
15/16” | 16 | 1.587 | 22.30 |
1” | 16 | 1.587 | 23.90 |
1-1/16” | 16 | 1.587 | 25.50 |
1-1/8” | 16 | 1.587 | 27.10 |
1-3/16” | 16 | 1.587 | 28.70 |
1-1/4” | 16 | 1.587 | 30.30 |
1-5/16” | 16 | 1.587 | 31.75 |
1-3/8” | 16 | 1.587 | 33.40 |
1-7/16” | 16 | 1.587 | 35.00 |
1-1/2” | 16 | 1.587 | 36.60 |
1-9/16” | 16 | 1.587 | 38.20 |
1-5/8” | 16 | 1.587 | 39.80 |
1-11/16” | 16 | 1.587 | 41.35 |
1-3/4” | 16 | 1.587 | 43.00 |
1-13/16” | 16 | 1.587 | 44.50 |
1-7/8” | 16 | 1.587 | 46.10 |
1-15/16” | 16 | 1.587 | 47.70 |
2” | 16 | 1.587 | 49.30 |
2-1/8” | 16 | 1.587 | 52.60 |
2-1/4” | 16 | 1.587 | 55.65 |
2-3/8” | 16 | 1.587 | 58.85 |
2-1/2” | 16 | 1.587 | 62.00 |
2-5/8” | 16 | 1.587 | 65.15 |
2-3/4” | 16 | 1.587 | 68.35 |
2-7/8” | 16 | 1.587 | 71.50 |
3” | 16 | 1.587 | 74.70 |
3-1/8” | 16 | 1.587 | 77.85 |
3-1/4” | 16 | 1.587 | 81.00 |
3-3/8” | 16 | 1.587 | 84.20 |
3-1/2” | 16 | 1.587 | 87.40 |
3-5/8” | 16 | 1.587 | 90.55 |
3-3/4” | 16 | 1.587 | 93.75 |
3-7/8” | 16 | 1.587 | 96.90 |
4” | 16 | 1.587 | 100.10 |
4-1/8” | 16 | 1.587 | 103.30 |
4-1/4” | 16 | 1.587 | 106.45 |
4-3/8” | 16 | 1.587 | 109.60 |
4-1/2” | 16 | 1.587 | 112.80 |
4-5/8” | 16 | 1.587 | 116.00 |
4-3/4” | 16 | 1.587 | 119.15 |
4-7/8” | 16 | 1.587 | 122.30 |
5” | 16 | 1.587 | 125.50 |
5-1/4” | 16 | 1.587 | 131.85 |
5-1/2” | 16 | 1.587 | 138.20 |
5-5/8” | 16 | 1.587 | 141.35 |
5-7/8” | 16 | 1.587 | 147.75 |
6” | 16 | 1.587 | 150.90 |
UNEF – 18 Threads Per Inch | |||
Nominal Dia. | TPI | Pitch | Tap Size |
1-1/16” | 18 | 1.411 | 25.80 |
1-1/8” | 18 | 1.411 | 27.35 |
1-1/4” | 18 | 1.411 | 30.55 |
1-5/16” | 18 | 1.411 | 32.10 |
1-3/8” | 18 | 1.411 | 33.70 |
1-7/16” | 18 | 1.411 | 35.30 |
1-1/2” | 18 | 1.411 | 36.90 |
1-9/16” | 18 | 1.411 | 38.55 |
1-5/8” | 18 | 1.411 | 40.10 |
1-11/16” | 18 | 1.411 | 41.60 |
UNEF – 20 Threads Per Inch | |||
Nominal Dia. | TPI | Pitch | Tap Size |
5/16” | 20 | 1.27 | 6.70 |
3/8” | 20 | 1.27 | 8.30 |
9/16” | 20 | 1.27 | 13.10 |
5/8” | 20 | 1.27 | 14.67 |
11/16” | 20 | 1.27 | 16.25 |
1-1/16” | 20 | 1.27 | 25.80 |
1-1/8” | 20 | 1.27 | 27.37 |
1-3/16” | 20 | 1.27 | 28.97 |
1-1/4” | 20 | 1.27 | 30.55 |
1-5/16” | 20 | 1.27 | 32.15 |
1-3/8” | 20 | 1.27 | 33.70 |
1-7/16” | 20 | 1.27 | 35.32 |
1-1/2” | 20 | 1.27 | 36.89 |
1-9/16” | 20 | 1.27 | 38.49 |
1-5/8” | 20 | 1.27 | 40.08 |
1-11/16” | 20 | 1.27 | 41.68 |
1-3/4” | 20 | 1.27 | 43.25 |
1-13/16” | 20 | 1.27 | 44.84 |
1-7/8” | 20 | 1.27 | 46.42 |
1-15/16” | 20 | 1.27 | 48.00 |
2” | 20 | 1.27 | 49.58 |
2-1/8” | 20 | 1.27 | 52.78 |
2-1/4” | 20 | 1.27 | 56.03 |
2-3/8” | 20 | 1.27 | 59.12 |
2-1/2” | 20 | 1.27 | 62.30 |
2-5/8” | 20 | 1.27 | 65.47 |
2-3/4” | 20 | 1.27 | 68.67 |
2-7/8” | 20 | 1.27 | 71.82 |
3” | 20 | 1.27 | 75.00 |
3/4” | 20 | 1.27 | 18.00 |
13/16” | 20 | 1.27 | 19.60 |
7/8” | 20 | 1.27 | 21.15 |
15/16” | 20 | 1.27 | 22.70 |
1” | 20 | 1.27 | 24.30 |
UNEF – 24 Threads Per Inch | |||
Nominal Dia. | TPI | Pitch | Tap Size |
9/16” | 24 | 1.058 | 13.40 |
5/8” | 24 | 1.058 | 15.00 |
11/16” | 24 | 1.058 | 16.60 |
UNEF – 28Threads Per Inch | |||
Nominal Dia. | TPI | Pitch | Tap Size |
7/16” | 28 | 0.907 | 10.35 |
1/2” | 28 | 0.907 | 11.80 |
UNEF – 32 Threads Per Inch | |||
Nominal Dia. | TPI | Pitch | Tap Size |
N 12 | 32 | 0.794 | 4.80 |
1/4” | 32 | 0.794 | 5.70 |
5/16” | 32 | 0.794 | 7.25 |
3/8” | 32 | 0.794 | 8.85 |