Unified Screw Threads Machinery's Handbook, 31st Edition
1987
Table 5g. 28-Thread Series, 28-UN and 28-UNR—Basic Dimensions Sizes Minor Diameter
Basic Major Dia., D Inches 0.2160 0.2500 0.3125 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
Basic Pitch Dia., a D 2 Inches 0.1928 0.2268 0.2893 0.3518 0.4143 0.4768 0.5393 0.6018 0.6643 0.7268 0.7893 0.8518 0.9143 0.9768 1.0393 1.1018 1.1643 1.2268 1.2893 1.3518 1.4143 1.4768
Lead Angel λ at Basic P.D.
Area of Minor Dia. at D -2 h b Sq. In. 0.0226 0.0326 0.0556 0.0848 0.1201 0.162
Ext. Thds., c d 3 (Ref.) Inches 0.1734 0.2074 0.2699 0.3324 0.3949 0.4574
Int. Thds., d D 1 Inches 0.1773 0.2113 0.2738 0.3363 0.3988 0.4613 0.5238 0.5863 0.6488 0.7113 0.7738 0.8363 0.8988 0.9613 1.0238 1.0863 1.1488 1.2113 1.2738 1.3363 1.3988 1.4613
Tensile Stress Area b Sq. In. 0.0258 0,0364 0.0606 0.0909 0.1274 0.170
Primary Inches
Secondary
Inches
Deg. Min.
12 (0.216) e
3 2 2 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
22 52 15 51 34 22 12 59 54 50 46 43 40 38 35 5 34 32 30 29 28 26
e
1 ∕ 4
5 ∕ 16
3 ∕ 8
e
7 ∕ 16
e
1 ∕ 2
0.5199 0.5824 0.6449 0.7074 0.7699 0.8324 0.8949 0.9574 1.0199 1.0824 1.1449 1.2074 1.2699 1.3324 1.3949 1.4574
0.209 0.263 0.323 0.389 0.461 0.539 0.624 0.714 0.811 0.914 1.023 1.138 1.259 1.386 1.52 1.66
0.219 0.274 0.335 0.402 0.475 0.554 0.640 0.732 0.830 0.933 1.044 1.160 1.282 1.411 1.55 1.69
9 ∕ 16
5 ∕ 8
11 ∕ 16
3 ∕ 4
13 ∕ 16
7 ∕ 8
15 ∕ 16
1
1 1 ∕ 16
1 1 ∕ 8
1 3 ∕ 16
1 1 ∕ 4
1 5 ∕ 16
1 3 ∕ 8
1 7 ∕ 16
1 1 ∕ 2
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. Table 5h. 32-Thread Series, 32-UN and 32-UNR—Basic Dimensions Sizes Minor Diameter
Lead Angel λ at Basic P.D. Deg. Min.
Basic Major Dia., D Inches 0.1380 0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.6875 0.7500 0.8125 0.8750 0.9375 1.0000
Basic Pitch Dia., a D Inches 0.1177 0.1437 0.1697 0.1957 0.2297 0.2922 0.3547 0.4172 0.4797 0.5422 0.6047 0.6672 0.7297 0.7922 0.8547 0.9172 0.9797
Area of Minor Dia. at D - 2 h b
Tensile Stress Area b Sq. In. 0.00909 0.0140 0.0200 0.0270 0.0379 0.0625 0.0932 0.1301 0.173 0.222 0.278 0.339 0.407 0.480
Ext.Thds., c d 3 (Ref.)
Int.Thds., d D 1
Primary Secondary
2
Inches
Inches
Inches 0.1008 0.1268 0.1528 0.1788 0.2128 0.2753 0.3378 0.4003 0.4628 0.5253 0.5878 0.6503 0.7128 0.7753 0.8378 0.9003 0.9628
Inches 0.1042 0.1302 0.1562 0.1822 0.2162 0.2787 0.3412 0.4037 0.4662 0.5287 0.5912 0.6537 0.7162 0.7787 0.8412 0.9037 0.9662
Sq. In. 0.00745 0.01196 0.01750 0.0242 0.0344 0.0581 0.0878 0.1237 0.166 0.214 0.268 0.329 0.395 0.468 0.547
6 (0.138) e 8 (0.164) e 10 (0.190) e
4 3 3 2 2 1 1 1 1 1 0 0 0 0 0 0 0
50 58 21 55 29 57 36 22 11 57 51 47 43 40 37 35 3
12 (0.216) e
e e e
1 ∕ 4
5 ∕ 16
3 ∕ 8
7 ∕ 16
1 ∕ 2
9 ∕ 16
5 ∕ 8
11 ∕ 16
3 ∕ 4
13 ∕ 16
0.560 0.646 0.738
7 ∕ 8
0.632 0.723
15 ∕ 16
1
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,UNF, or UNEF Series.
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