Machinery's Handbook, 31st Edition
1984
Unified Screw Threads Table 5d. 12-Thread series, 12-UN and 12-UNR—Basic Dimensions Sizes Minor Diameter
Basic Major Dia., D Inches 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 5.5000 5.6250 5.7500 5.8750 6.0000
Basic Pitch Dia., a D 2 Inches 0.5084 0.5709 0.6334 0.6959 0.7584 0.8209 0.8834 0.9459 1.0084 1.0709 1.1334 1.1959 1.2584 1.3209 1.3834 1.4459 1.5084 1.5709 1.6334 1.6959 1.7584 1.8209 1.8834 1.9459 2.0709 2.1959 2.3209 2.4459 2.5709 2.6959 2.8209 2.9459 3.0709 3.1959 3.3209 3.4459 3.5709 3.6959 3.8209 3.9459 4.0709 4.1959 4.3209 4.4459 4.5709 4.6959 4.8209 4.9459 5.0709 5.1959 5.3209 5.4459 5.5709 5.6959 5.8209 5.9459
Lead Angle λ at Basic P.D.
Area of Minor Dia. at D − 2 h b Sq. In. 0.162 0.210
Tensile Stress Area b Sq. In. 0.182 0.232 0.289 0.351 0.420 0.495
Ext. Thds., c d 3 (Ref.) Inches 0.4633 0.5258 0.5883 0.6508 0.7133 0.7758 0.8383 0.9008 0.9633 1.0258 1.0883 1.1508 1.2133 1.2758
Int. Thds., d D 1 Inches 0.4723 0.5348 0.5973 0.6598 0.7223 0.7848 0.8473 0.9098 0.9723 1.0348 1.0973 1.1598 1.2223 1.2848 1.3473 1.4098 1.4723 1.5348 1.5973 1.6598 1.7223 1.7848 1.8473 1.9098 2.0348 2.1598 2.2848 2.4098 2.5348 2.6598 2.7848 2.9098 3.0348 3.1598 3.2848 3.4098 3.5348 3.6598 3.7848 3.9098 4.0348 4.1598 4.2848 4.4098 4.5348 4.6598 4.7848 4.9098 5.0348 5.1598 5.2848 5.4098 5.5348 5.6598 5.7848 5.9098
Primary Inches
Secondary Inches
Deg. Min.
2 2 2 2 2 1 1 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
59 40 24 11 51 43 36 30 0 25 20 16 12
e
9 ∕ 16
5 ∕ 8
0.264 0.323 0.390 0.462 0.540 0.625 0.715 0.812 0.915 1.024 1.139 1.260 1.388 1.52 1.66 1.81 1.96
11 ∕ 16
3 ∕ 4
13 ∕ 16
7 ∕ 8
0.576 0.663 0.756 0.856 0.961 1.073 1.191 1.315 1.445 1.58 1.72 1.87 2.03
15 ∕ 16
1 e
1 1 ∕ 16 1 3 ∕ 16 1 5 ∕ 16 1 7 ∕ 16 1 9 ∕ 16
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2 1 5 ∕ 8 1 3 ∕ 4 1 7 ∕ 8
e
e
9 6 3 0
1.3383 1.4008 1.4633 1.5258 1.5883 1.6508 1.7133 1.7758 1.8383 1.9008 2.0258 2.1508 2.2758 2.4008 2.5258 2.6508 2.7758 2.9008 3.0258 3.1508 3.2758 3.4008 3.5258 3.6508 3.7758 3.9008 4.0258 4.1508 4.2758 4.4008 4.5258 4.6508 4.7758 4.9008 5.0258 5.1508 5.2758 5.4008 5.5258 5.6508 5.7758 5.9008
e
58 56 54 52 50 48 47 44 42 39 37 35 34 32 31 30 29 27 26 26 25 24 23 22 22 21 21 20 19 19 18 18 18 17 17 16 16 16 15
1 11 ∕ 16 1 13 ∕ 16 1 15 ∕ 16
2.12 2.28 2.45 2.63 2.81 3.19 3.60 4.04 4.49 4.97 5.48 6.01 6.57 7.15 7.75 8.38
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
2
2 1 ∕ 8 2 3 ∕ 8 2 5 ∕ 8 2 7 ∕ 8 3 1 ∕ 8 3 3 ∕ 8 3 5 ∕ 8 3 7 ∕ 8 4 1 ∕ 8 4 3 ∕ 8 4 5 ∕ 8 4 7 ∕ 8 5 1 ∕ 8 5 3 ∕ 8 5 5 ∕ 8 5 7 ∕ 8
2 1 ∕ 4 2 1 ∕ 2 2 3 ∕ 4
3
3 1 ∕ 4 3 1 ∕ 2 3 3 ∕ 4
9.03 9.71 10.42 11.14 11.90 12.67 13.47 14.30
9.18 9.86 10.57 11.30 12.06 12.84 13.65 14.48
4
4 1 ∕ 4 4 1 ∕ 2 4 3 ∕ 4
15.1 16.0 16.9 17.8 18.8 19.8 20.8 21.8 22.8 23.9 25.0 26.1 27.3
15.3 16.2 17.1 18.0 19.0 20.0 21.0 22.0 23.1 24.1 25.2 26.4 27.5
5
5 1 ∕ 4 5 1 ∕ 2 5 3 ∕ 4
6
a British: Effective Diameter. b See formula, pages 1660 and 1668. c Design form for UNR threads. (See figure on page 1948). d Basic minor diameter. e These are standard sizes of the UNC or UNF series.
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