Unified Screw Threads Machinery's Handbook, 31st Edition
1985
Table 5e. 16-Thread Series, 16-UN and 16-UNR—Basic Dimensions Sizes Minor Diameter
Basic Pitch Dia., a D Inches 0.3344 0.3969 0.4594 0.5219 0.5844 0.6469 0.7094 0.7719 0.8344 0.8969 0.9594 1.0219 1.0844 1.1469 1.2094 1.2719 1.3344 1.3969 1.4594 1.5219 1.5844 1.6469 1.7094 1.7719 1.8344 1.8969 1.9594 2.0844 2.2094 2.3344 2.4594 2.5844 2.7094 2.8344 2.9594 3.0844 3.2094 3.3344 3.4594 3.5844 3.7094 3.8344 3.9594 4.0844 4.2094 4.3344 4.4594 4.5844 4.7094 4.8344 4.9594 5.0844 5.2094 5.3344
Basic Major Dia., D Inches 0.3750 0.4375 0.5000 0.5625 0.6250 0.6875 0.7500 0.8125 0.8750 0.9375 1.0000 1.0625 1.1250 1.1875 1.2500 1.3125 1.3750 1.4375 1.5000 1.5625 1.6250 1.6875 1.7500 1.8125 1.8750 1.9375 2.0000 2.1250 2.2500 2.3750 2.5000 2.6250 2.7500 2.8750 3.0000 3.1250 3.2500 3.3750 3.5000 3.6250 3.7500 3.8750 4.0000 4.1250 4.2500 4.3750 4.5000 4.6250 4.7500 4.8750 5.0000 5.1250 5.2500 5.3750
Lead Angle λ at Basic P.D. Deg. Min.
Area of Minor Dia. at D − 2 h b
Tensile Stress Area b Sq. In. 0.0775 0.1114
Ext. Thds., c d 3 (Ref.)
Int. Thds., d D 1
Primary Secondary
2
Inches
Inches
Inches 0.3005 0.3630 0.4255 0.4880 0.5505 0.6130 0.6755 0.7380 0.8005 0.8630 0.9255 0.9880 1.0505 1.1130 1.1755 1.2380 1.3005 1.3630 1.4255 1.4880 1.5505 1.6130 1.6755 1.7380 1.8005 1.8630 1.9255 2.0505 2.1755 2.3005 2.4255 2.5505 2.6755 2.8005 2.9255 3.0505 3.1755 3.3005 3.4255 3.5505 3.6755 3.8005 3.9255 4.0505 4.1755 4.3005 4.4255 4.5505 4.6755 4.8005 4.9255 5.0505 5.1755 5.3005
Inches 0.3073 0.3698 0.4323 0.4948 0.5573 0.6198 0.6823 0.7448 0.8073 0.8698 0.9323 0.9948 1.0573 1.1198 1.1823 1.2448 1.3073 1.3698 1.4323 1.4948 1.5573 1.6198 1.6823 1.7448 1.8073 1.8698 1.9323 2.0573 2.1823 2.3073 2.4323 2.5573 2.6823 2.8073 2.9323 3.0573 3.1823 3.3073 3.4323 3.5573 3.6823 3.8073 3.9323 4.0573 4.1823 4.3073 4.4323 4.5573 4.6823 4.8073 4.9323 5.0573 5.1823 5.3073
Sq. In. 0.0678 0.0997 0.1378 0.182 0.232 0.289 0.351
3 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
24 52 29 11 57 46 36 29 22 16 11
e
3 ∕ 8
7 ∕ 16
0.151 0.198 0.250 0.308 0.373 0.444 0.521 0.604 0.693 0.788 0.889 0.997 1.111 1.230 1.356 1.488
1 ∕ 2
9 ∕ 16
5 ∕ 8
11 ∕ 16
e
3 ∕ 4
0.420 0.495 0.576 0.663 0.756 0.856 0.961 1.073 1.191 1.315 1.445 1.58
13 ∕ 16
7 ∕ 8
15 ∕ 16
1
7 3 0
1 1 ∕ 16
1 1 ∕ 8
1 3 ∕ 16
57 54 51 49 47 45 43 42 40 39 37 36 35 33 31 29 28 26 25 24 23 22 21 21 20 19 18 18 17 17 16 16 15 15 15 14 14 13 13 13
1 1 ∕ 4
1 5 ∕ 16
1 3 ∕ 8
1 7 ∕ 16
1.63 1.77 1.92 2.08 2.24 2.41 2.58 2.77 2.95 3.35 3.76 4.21 4.67 5.16 5.68 6.22 6.78 7.37 7.99 8.63
1 1 ∕ 2
1.72 1.87 2.03 2.19 2.35 2.53 2.71 2.89 3.28 3.69 4.13 4.60 5.08 5.59 6.13 6.69 7.28 7.89 8.52 9.18
1 9 ∕ 16
1 5 ∕ 8
1 11 ∕ 16
1 3 ∕ 4
1 13 ∕ 16
1 7 ∕ 8
1 15 ∕ 16
2
2 1 ∕ 8
2 1 ∕ 4
2 3 ∕ 8
2 1 ∕ 2
2 5 ∕ 8
2 3 ∕ 4
2 7 ∕ 8
3
3 1 ∕ 8
3 1 ∕ 4
3 3 ∕ 8
9.29 9.98 10.69 11.43 12.19 12.97 13.78 14.62
3 1 ∕ 2
9.86 10.57 11.30 12.06 12.84 13.65 14.48 15.34
3 5 ∕ 8
3 3 ∕ 4
3 7 ∕ 8
4
4 1 ∕ 8
4 1 ∕ 4
4 3 ∕ 8
15.5 16.4 17.3 18.2 19.2 20.1 21.1 22.2
4 1 ∕ 2
16.2 17.1 18.0 19.0 20.0 21.0 22.0
4 5 ∕ 8
4 3 ∕ 4
4 7 ∕ 8
5
5 1 ∕ 8
5 1 ∕ 4
5 3 ∕ 8
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