Thread Charts

UNEF – Unified Extra Fine 60° (mm)

09 Feb

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
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Newer UNR – Unified Thread Root 60°
Older UNC – Unified Coarse 60° (mm)

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