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16UNJ - 16 Pitch Unified Threads

with Controlled Root Radius and Increased Minor Diameter

The 16-thread series (16-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 7/16 inches.

7/16" - 1 3/8" 1 1/4"- 1 15/16" 2"- 3 3/8" 3 1/2" - 4 7/8" 5"- 6"

16UNJ Threads

Basic Size Primary Basic Size Secondary External thread - 16UNJ Class 3A - Root Radius 0.0094 - 0.0113 Internal thread - 16UNJ Class 3B Root Radius 0.0094 - 0.0113
Major Diameter Min Major Diameter Max Pitch Diameter Min Pitch Diameter Max Minor Diameter Min Minor Diameter Max Minor Diameter Min Minor Diameter Max Pitch Diameter Min Pitch Diameter Max Major Diameter Min
7/16" - 16UNJ - 10.87 11.11 9.99 10.08 9.1 9.28 9.57 9.82 10.08 10.2 11.11
1/2" - 16UNJ - 12.46 12.7 11.58 11.67 10.68 10.87 11.16 11.4 11.67 11.79 12.7
9/16" - 16UNJ - 14.05 14.29 13.17 13.26 12.27 12.45 12.74 12.98 13.26 13.37 14.29
5/8" - 16UNJ - 15.64 15.88 14.75 14.84 13.85 14.04 14.33 14.56 14.84 14.96 15.88
- 11/16" - 16UNJ 17.22 17.46 16.34 16.43 15.44 15.63 15.92 16.14 16.43 16.55 17.46
- 13/16" - 16UNJ 20.4 20.64 19.51 19.61 18.62 18.8 19.09 19.31 19.61 19.73 20.64
7/8" - 16UNJ - 21.99 22.23 21.1 21.19 20.2 20.39 20.68 20.9 21.19 21.31 22.23
- 15/16" - 16UNJ 23.57 23.81 22.69 22.78 21.79 21.98 22.27 22.48 22.78 22.91 23.81
1" - 16UNJ - 25.16 25.4 24.27 24.37 23.38 23.57 23.86 24.07 24.37 24.49 25.4
- 1 1/16" - 16UNJ 26.75 26.99 25.86 25.96 24.96 25.15 25.44 25.66 25.96 26.08 26.99
1 1/8" - 16UNJ - 28.34 28.58 27.45 27.54 26.55 26.74 27.03 27.25 27.54 27.67 28.58
- 1 3/8" - 16UNJ 29.92 30.16 29.03 29.13 28.14 28.33 28.62 28.83 29.13 29.26 30.16
1 1/4" - 16UNJ - 31.51 31.75 30.62 30.72 29.72 29.92 30.21 30.42 30.72 30.85 31.75
- 1 5/16" - 16UNJ 33.1 33.34 32.21 32.31 31.31 31.5 31.79 32.01 32.31 32.43 33.34
1 3/8" - 16UNJ - 34.69 34.93 33.8 33.89 32.9 33.09 33.38 33.6 33.89 34.02 34.93
- 1 7/16" - 16UNJ 36.27 36.51 35.38 35.48 34.48 34.68 34.97 35.18 35.48 35.61 36.51
1 1/2" - 16UNJ - 37.86 38.1 36.97 37.07 36.07 36.27 36.56 36.77 37.07 37.2 38.1
- 1 9/16" - 16UNJ 39.45 39.69 38.56 38.66 37.66 37.85 38.14 38.36 38.66 38.79 39.69
1 5/8" - 16UNJ - 41.04 41.28 40.14 40.24 39.25 39.44 39.73 39.95 40.24 40.37 41.28
- 1 11/16" - 16UNJ 42.62 42.86 41.73 41.83 40.83 41.03 41.32 41.53 41.83 41.96 42.86
1 3/4" - 16UNJ - 44.21 44.45 43.32 43.42 42.42 42.62 42.91 42.87 43.42 43.55 44.45
- 1 13/16" - 16UNJ 45.8 46.04 44.9 45.01 44.01 44.2 44.49 44.71 45.01 45.14 46.04
1 7/8" - 16UNJ - 47.39 47.63 46.49 46.59 45.59 45.79 46.08 46.3 46.59 46.73 47.63
- 1 15/16" - 16UNJ 48.97 50.48 48.08 48.18 47.18 47.38 47.67 47.88 48.18 48.31 49.21
2" - 16UNJ - 50.56 50.8 49.67 49.77 48.77 48.97 49.26 49.47 49.77 49.9 50.8
- 2 1/8" - 16UNJ 53.74 53.98 27.44 52.94 51.94 52.14 52.43 52.65 52.94 53.08 53.98
2 1/4" - 16UNJ - 56.91 57.15 56.02 56.12 55.12 55.32 55.61 55.82 56.12 56.25 57.15
- 2 3/8" - 16UNJ 60.09 60.33 59.19 59.29 58.29 58.49 58.78 59 59.29 59.43 60.33
2 1/2" - 16UNJ - 63.26 63.5 62.36 62.47 61.47 61.67 61.96 62.17 62.47 62.61 63.5
- 2 5/8" - 16UNJ 66.44 66.68 65.54 65.64 64.64 64.84 65.13 65.35 65.64 65.78 66.68
2 3/4" - 16UNJ - 69.61 69.85 68.71 68.82 67.82 68.02 68.31 68.52 68.82 68.96 69.85
- 2 7/8" - 16UNJ 72.79 73.03 71.89 71.99 70.99 71.19 71.48 71.7 71.99 72.13 73.03
3" - 16UNJ - 75.96 76.2 75.06 75.17 74.16 74.37 74.66 74.87 75.17 75.31 76.2
- 3 1/8" - 16UNJ 79.14 79.38 78.24 78.34 77.34 77.54 77.83 78.05 78.34 78.48 79.38
3 1/4" - 16UNJ - 82.31 82.55 81.41 81.52 80.51 80.72 81.01 81.22 81.52 81.66 82.55
- 3 3/8" - 16UNJ 85.49 85.73 84.58 84.69 83.69 83.89 84.18 84.4 84.69 84.84 85.73
3 1/2" - 16UNJ - 88.66 88.9 87.76 87.87 86.86 87.07 87.36 87.57 87.87 88.01 88.9
- 3 5/8" - 16UNJ 91.84 92.08 90.93 91.04 90.04 90.24 90.53 90.75 91.04 91.19 92.08
3 3/4" - 16UNJ - 95.01 95.25 94.11 94.22 93.21 93.42 93.71 93.92 94.22 94.36 95.25
- 3 7/8" - 16UNJ 98.19 98.43 97.28 97.39 96.38 96.59 96.88 97.1 97.39 97.54 98.43
4" - 16UNJ - 101.36 101.6 100.46 100.57 99.56 99.77 100.06 100.27 100.57 100.71 101.6
- 4 1/4" - 16UNJ 104.54 104.78 103.63 103.74 102.73 102.94 103.23 103.45 103.74 103.89 104.78
4 1/4" - 16UNJ - 107.71 107.95 106.81 106.92 105.91 106.12 106.41 106.62 106.92 107.06 107.95
- 4 3/8" - 16UNJ 110.89 111.13 109.98 110.09 109.08 109.29 109.58 109.8 110.09 110.24 111.13
4 1/2" - 16UNJ - 114.06 114.3 113.16 113.27 112.26 112.47 112.76 112.97 113.27 113.41 114.3
- 4 5/8" - 16UNJ 117.24 117.48 116.33 116.44 115.43 115.64 115.93 116.15 116.44 116.59 117.48
4 3/4" - 16UNJ - 120.41 120.65 119.5 119.62 118.61 118.82 119.11 119.32 119.62 119.77 120.65
- 4 7/8" - 16UNJ 123.59 123.83 122.68 122.79 121.78 121.99 122.28 122.5 122.79 122.94 123.83
5" - 16UNJ - 126.76 127 125.85 125.97 124.96 125.17 125.46 125.67 125.97 126.12 127
- 5 1/4- 16UNJ 129.94 130.18 129.03 129.14 128.13 128.34 128.63 128.85 129.14 129.29 130.18
5 1/4" - 16UNJ - 133.11 133.35 132.2 132.32 131.31 131.52 131.81 132.02 132.32 132.47 133.35
- 5 3/8" - 16UNJ 136.29 136.53 135.38 135.49 134.48 134.69 134.98 135.2 135.49 135.64 136.53
5 1/2" - 16UNJ - 139.46 139.7 138.55 138.67 137.66 137.87 138.16 138.37 138.67 138.82 139.7
- 5 5/8" - 16UNJ 142.64 142.88 141.72 141.84 140.83 141.04 141.33 141.55 141.84 142 142.88
5 3/4" - 16UNJ - 145.81 146.05 144.9 145.02 144 144.22 144.51 144.72 145.02 145.17 146.05
- 5 7/8" - 16UNJ 148.99 149.23 148.07 148.19 147.18 147.39 147.68 147.9 148.19 148.35 149.23
6" - 16UNJ - 152.16 152.4 151.25 151.37 150.35 150.57 150.86 151.07 151.37 151.52 152.4