Unified Screw Threads Machinery's Handbook, 31st Edition
1983
Table 5c. 8-Thread Series, 8-UN and 8-UNR—Basic Dimensions Sizes Minor Diameter
Basic Major Dia., D Inches
Basic Pitch Dia., a D Inches
Tensile Stress Area b Sq. In. 0.606 0.695 0.790 0.892 1.000 1.114 1.233 1.360 1.492 1.63
Lead Angle λ at Basic P.D.
Area of Minor Dia. at D − 2 h b
Ext.Thds., c d 3 (Ref.)
Int.Thds., d D 1
Primary Secondary
2
Inches
Inches
Inches
Inches Deg. Min.
Sq. In.
1 e
1.0000 0.9188 0.8512 1.0625 0.9813 0.9137 1.1250 1.0438 0.9792 1.1875 1.1063 1.0387 1.2500 1.1688 1.1012 1.4375 1.3563 1.2887 1.5000 1.4188 1.3512 1.5625 1.4813 1.4137 1.6250 1.5438 1.4806 1.6875 1.6063 1.5387 1.7500 1.6688 1.6012 1.8125 1.7313 1.6637 1.8750 1.7938 1.7262 1.3125 1.2313 1.1637 1.2262 1.3750 1.2938 1.9375 1.8563 1.7887 2.0000 1.9188 1.8512 2.1250 2.0438 1.9762 2.2500 2.1688 2.1012 2.5000 2.4188 2.3512 2.6250 2.5438 2.4762 2.7500 2.6688 2.6012 2.8750 2.7938 2.7262 2.3750 2.2938 2.2262 3.0000 2.9188 2.8512 3.1250 3.0438 2.9762 3.2500 3.1688 3.1012 3.5000 3.4188 3.3512 3.6250 3.5438 3.4762 3.7500 3.6688 3.6012 3.8750 3.7938 3.7262 3.3750 3.2938 3.2262 4.0000 3.9188 3.8512 4.1250 4.0438 3.9762 4.2500 4.1688 4.1012 4.5000 4.4188 4.3512 4.6250 4.5438 4.4762 4.7500 4.6688 4.6012 4.8750 4.7938 4.7262 4.3750 4.2938 4.2262 5.0000 4.9188 4.8512 5.1250 5.0438 4.9762 5.2500 5.1688 5.1012 5.3750 5.2938 5.2262 5.5000 5.4188 5.3512 5.6250 5.5438 5.4762 5.7500 5.6688 5.6012 5.8750 5.7938 5.7262 6.0000 5.9188 5.8512
0.8647 0.9272 0.9897 1.0522 1.1147 1.1772 1.2397 1.3022 1.3647 1.4272 1.4897 1.5522 1.6147 1.6772 1.7397 1.8022 1.8647 1.9897 2.1147 2.2397
2 2
29 19
0.551 0.636 0.728 0.825 0.929 1.039 1.155 1.277 1.405 1.54 1.68 1.83
1 1 ∕ 16
2 11 2 4
1 1 ∕ 8
1 3 ∕ 16
1 1
57 51
1 1 ∕ 4
1 5 ∕ 16
1 46 1 41 1 36 1 32
1 3 ∕ 8
1 7 ∕ 16
1 1 ∕ 2
1 9 ∕ 16
1 1
29 25
1.78 1.93 2.08 2.25 2.41 2.59 2.77 3.15 3.56 3.99 4.44 4.92 5.43 5.95 6.51 7.08
1 5 ∕ 8
1 11 ∕ 16
1 22
1.98 2.14 2.30 2.47 2.65 3.03 3.42 3.85 4.29 4.76 5.26 5.78 6.32 6.89 7.49 8.11
1 3 ∕ 4
1
19
1 13 ∕ 16
1 16 1 14 1 11 1 3 1 7
1 7 ∕ 8
1 15 ∕ 16
2
2 1 ∕ 8
2 1 ∕ 4
1
0
2 3 ∕ 8
2.3647 0 57 2.4897 0 54 2.6147 0 51 2.7397 0 49 2.8647 0 47 2.9897 0 45
2 1 ∕ 2
2 5 ∕ 8
2 3 ∕ 4
2 7 ∕ 8 3 1 ∕ 8
3
3.1147 0 3.2397 0
43 42
7.69 8.31 8.96 9.64 10.34 11.06 11.81 12.59 13.38 14.21 15.1 15.9 16.8 17.7 18.7 19.7
3 1 ∕ 4
3 3 ∕ 8
3.3647 0 40 3.4897 0 39 3.6147 0 37
8.75 9.42 10.11 10.83 11.57 12.34 13.12 13.94 14.78 15.6 16.5 17.4 18.4 19.3 20.3 21.3
3 1 ∕ 2
3 5 ∕ 8
3 3 ∕ 4
3.7397 0 3.9897 0 4.1147 0 4.2397 0 4.3647 0
36 34 33 32 31
3 7 ∕ 8 4 1 ∕ 8
4
3.8647 0 35
4 1 ∕ 4
4 3 ∕ 8
4 1 ∕ 2
4.4897 0 30 4.6147 0 29 4.7397 0 29 4.8647 0 28 4.9897 0 27
4 5 ∕ 8
4 3 ∕ 4
4 7 ∕ 8 5 1 ∕ 8
5
5.1147 0 5.2397 0
26 26
20.7 21.7 22.7 23.8 24.9 26.0 27.1
5 1 ∕ 4
5 3 ∕ 8
5.3647 0 25 5.4897 0 25
22.4 23.4 24.5 25.6 26.8
5 1 ∕ 2
5 5 ∕ 8
5.6147 0 5.7397 0 5.8647 0
24 24 23
5 3 ∕ 4
5 7 ∕ 8
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 This is a standard size of the UNC series.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online