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12UNJ - 12 Pitch Unified Threads

with Controlled Root Radius and Increased Minor Diameter

The 12-thread series (12-UNJ) is a uniform pitch series for large diameters requiring threads of medium-fine pitch Aerospace Quality Threads with controlled Root Radius, it is now used as a continuation of the Fine-Thread Series for diameters larger than 5/8 inches.

5/8" - 1 5/8" 1 11/16 - 2 3/4" 2 7/8 - 4 1/4" 4 3/8" - 5 3/4" 5 5/8" - 6"

12UNJ Threads
5/8" - 12UNJ - 15.59 15.88 14.4 14.5 13.2 13.43 13.82 14.07 14.5 14.64 15.88
- 11/16" - 12 UNJ 17.17 17.46 15.98 16.09 14.79 15.02 15.4 15.66 16.09 16.22 17.46
3/4" - 12UNJ - 18.76 19.05 17.57 17.68 16.37 16.61 16.99 17.24 17.68 17.81 19.05
- 13/16" - 12 UNJ 20.35 20.64 19.16 19.26 17.96 18.19 18.58 18.83 19.26 19.4 20.64
7/8" - 12UNJ - 21.94 22.23 20.75 20.85 19.55 19.78 20.17 20.42 20.85 20.99 22.23
- 15/16" - 12 UNJ 23.52 23.81 22.33 22.44 21.13 21.37 21.75 22.01 22.44 22.58 23.81
- 1 1/16" - 12 UNJ 26.7 26.99 25.51 25.61 24.31 24.54 24.93 25.18 25.61 25.75 26.99
- 1 3/8" - 12 UNJ 29.87 30.16 28.68 28.79 27.48 27.72 28.1 28.36 28.79 28.93 30.16
- 1 5/16" - 12 UNJ 33.05 33.34 31.85 31.96 30.66 30.89 31.28 31.53 31.96 32.11 33.34
- 1 7/16" - 12 UNJ 36.22 36.51 35.03 35.14 33.83 34.07 34.45 34.71 35.14 35.28 36.51
 - 1 9/16" - 12 UNJ 39.4 39.69 38.2 38.31 37 37.24 37.63 37.88 38.31 38.46 39.69
1 5/8" - 12UNJ - 40.99 41.28 39.79 39.9 38.59 38.83 39.22 39.47 39.9 40.05 41.28
- 1 11/16" - 12 UNJ 42.57 42.86 41.37 41.49 40.18 40.42 40.8 41.06 41.49 41.64 42.86
1 3/4" - 12UNJ - 44.16 44.45 42.96 43.08 41.76 42.01 42.39 42.64 43.08 43.22 44.45
- 1 13/16" - 12 UNJ 45.75 46.04 44.55 44.66 43.35 43.59 43.98 44.23 44.66 44.81 46.04
1 7/8" - 12UNJ - 47.34 47.63 46.14 46.25 44.94 45.18 45.57 45.82 46.25 46.4 47.63
2" - 12UNJ - 48.92 49.21 47.72 47.84 46.53 46.77 47.15 47.41 47.84 47.99 49.21
- 1 15/16" - 12 UNJ 50.51 50.8 49.31 49.43 48.11 48.36 48.74 48.99 49.43 49.58 50.8
- 2 1/8" - 12 UNJ 53.69 53.98 52.49 52.6 51.29 51.53 51.92 52.17 52.6 52.75 53.98
2 1/4" - 12UNJ - 56.86 57.15 55.66 55.78 54.46 54.71 55.09 55.34 55.78 55.93 57.15
- 2 3/8" - 12 UNJ 60.04 60.33 58.83 58.95 57.64 57.88 58.27 58.52 58.95 59.1 60.33
2 1/2" - 12UNJ - 63.21 63.5 62.01 62.13 60.81 61.06 61.44 61.69 62.13 62.28 63.5
 - 2 5/8" - 12 UNJ 66.39 66.68 65.18 65.3 63.99 64.23 64.62 64.87 65.3 65.45 66.68
2 3/4" - 12UNJ - 69.56 69.85 68.36 68.48 67.16 67.41 67.79 68.04 68.48 68.63 69.85
- 2 7/8" - 12 UNJ 72.74 73.03 71.53 71.65 70.33 70.58 70.97 71.22 71.65 71.81 73.03
3" - 12UNJ - 75.91 76.2 74.71 74.83 73.51 73.76 74.14 74.39 74.83 74.98 76.2
- 3 1/8" - 12 UNJ 79.09 79.38 77.88 78 76.68 76.93 77.32 77.57 78 78.16 79.38
3 1/4" - 12UNJ - 82.26 82.55 81.06 81.18 79.86 80.11 80.49 80.74 81.18 81.33 82.55
- 3 3/8" - 12 UNJ 85.44 85.73 84.23 84.35 83.03 83.28 83.67 83.92 84.35 84.51 85.73
3 1/2" - 12UNJ - 88.61 88.9 87.4 87.53 86.21 86.46 86.84 87.09 87.53 87.69 88.9
- 3 5/8" - 12 UNJ 91.79 92.08 90.58 90.7 89.38 89.63 90.02 90.27 90.7 90.86 92.08
3 3/4" - 12UNJ - 94.96 95.25 93.75 93.88 92.56 92.81 93.19 93.44 93.88 94.04 95.25
- 3 7/8" - 12 UNJ 98.14 98.43 96.93 97.05 95.73 95.98 96.37 96.62 97.05 97.21 98.43
4" - 12UNJ - 101.31 101.6 100.1 100.23 98.9 99.16 99.54 99.79 99.72 100.39 101.6
 - 4 1/4" - 12 UNJ 104.49 104.78 103.28 103.4 102.08 102.33 102.72 102.97 103.4 103.56 104.78
4 1/4" - 12UNJ - 107.66 107.95 106.45 106.58 105.25 105.51 105.89 106.14 106.58 106.74 107.95
- 4 3/8" - 12 UNJ 110.84 111.13 109.63 109.75 108.43 108.68 109.07 109.32 109.75 109.91 111.13
4 1/2" - 12UNJ - 114.01 114.3 112.8 112.93 111.6 111.86 112.24 112.49 112.93 113.09 114.3
- 4 5/8" - 12 UNJ 117.19 117.48 115.97 116.1 114.78 115.03 115.42 115.67 116.1 116.27 117.48
4 3/4" - 12UNJ - 120.36 120.65 119.15 119.28 117.95 118.21 118.59 118.84 119.28 119.44 120.65
- 4 7/8" - 12 UNJ 123.54 123.83 122.32 122.45 121.13 121.38 121.77 122.02 122.45 122.62 123.83
5" - 12UNJ - 126.71 127 125.5 125.63 124.3 124.56 124.94 125.19 125.63 125.79 127
- 5 1/4" - 12 UNJ 129.89 130.18 128.67 128.8 127.48 127.73 128.12 128.37 128.8 128.97 130.18
5 1/4" - 12UNJ - 133.06 133.35 131.85 131.98 130.65 130.91 131.29 131.54 131.98 132.14 133.35
- 5 3/8" - 12 UNJ 136.24 136.53 135.02 135.15 133.83 134.08 134.47 134.72 135.15 135.32 136.53
5 1/2" - 12UNJ - 139.41 139.7 138.2 138.33 137 137.26 137.64 137.89 138.33 138.49 139.7
- 5 5/8" - 12 UNJ 142.59 142.88 141.37 141.5 140.17 140.43 140.82 141.07 141.5 141.67 142.88
5 3/4" - 12UNJ - 145.76 146.05 144.54 144.68 143.35 143.61 143.99 144.24 144.68 144.85 146.05
- 5 7/8" - 12 UNJ 148.94 149.23 147.72 147.85 146.52 146.78 147.17 147.42 147.85 148.02 149.23
6" - 12UNJ - 152.11 152.4 150.89 151.03 149.7 149.96 150.34 150.59 151.03 151.2 152.4