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UNIFIED SCREW THREADS 1769
Table 5d. 12-Thread series, 12-UN and 12-UNR—Basic Dimensions
Sizes Basic
Major
Dia.,
Primary Secondary D
Machinery's Handbook 27th Edition
Basic
Pitch
Dia., a
D2 a British: Effective Diameter.
b See formula, pages 1502 and 1510.
c Design form for UNR threads. (See figure on page 1733.)
d Basic minor diameter.
e These are standard sizes of the UNC or UNF Series.
Minor Diameter Lead
Ext.
Thds., c
d3 (Ref.)
Int.
Thds., d
D1 Angle λ
at Basic
P.D.
Area of
Minor
Dia. at
D − 2hb Tensile
Stress
Areab Inches Inches Inches Inches Inches Inches Deg. Min. Sq. In. Sq. In.
9
⁄16
e
0.5625 0.5084 0.4633 0.4723 2 59 0.162 0.182
5
⁄8 0.6250 0.5709 0.5258 0.5348 2 40 0.210 0.232
11
⁄16 0.6875 0.6334 0.5883 0.5973 2 24 0.264 0.289
3
⁄4 0.7500 0.6959 0.6508 0.6598 2 11 0.323 0.351
13
⁄16 0.8125 0.7584 0.7133 0.7223 2 0 0.390 0.420
7
⁄8 0.8750 0.8209 0.7758 0.7848 1 51 0.462 0.495
15
⁄16 0.9375 0.8834 0.8383 0.8473 1 43 0.540 0.576
1e 1.0000 0.9459 0.9008 0.9098 1 36 0.625 0.663
11 ⁄ 16 1.0625 1.0084 0.9633 0.9723 1 30 0.715 0.756
11 ⁄ e
8 1.1250 1.0709 1.0258 1.0348 1 25 0.812 0.856
13 ⁄ 16 1.1875 1.1334 1.0883 1.0973 1 20 0.915 0.961
11 ⁄ e
4 1.2500 1.1959 1.1508 1.1598 1 16 1.024 1.073
15 ⁄ 16 1.3125 1.2584 1.2133 1.2223 1 12 1.139 1.191
13 ⁄ 8 1.3750 1.3209 1.2758 1.2848 1 9 1.260 1.315
17 ⁄ 16 1.4375 1.3834 1.3383 1.3473 1 6 1.388 1.445
11 ⁄ e
2 1.5000 1.4459 1.4008 1.4098 1 3 1.52 1.58
19 ⁄ 16 1.5625 1.5084 1.4633 1.4723 1 0 1.66 1.72
15 ⁄ 8 1.6250 1.5709 1.5258 1.5348 0 58 1.81 1.87
111 ⁄ 16 1.6875 1.6334 1.5883 1.5973 0 56 1.96 2.03
13 ⁄ 4 1.7500 1.6959 1.6508 1.6598 0 54 2.12 2.19
113 ⁄ 16 1.8125 1.7584 1.7133 1.7223 0 52 2.28 2.35
17 ⁄ 8 1.8750 1.8209 1.7758 1.7848 0 50 2.45 2.53
115 ⁄ 16 1.9375 1.8834 1.8383 1.8473 0 48 2.63 2.71
2 2.0000 1.9459 1.9008 1.9098 0 47 2.81 2.89
21 ⁄ 8 2.1250 2.0709 2.0258 2.0348 0 44 3.19 3.28
21 ⁄ 4 2.2500 2.1959 2.1508 2.1598 0 42 3.60 3.69
23 ⁄ 8 2.3750 2.3209 2.2758 2.2848 0 39 4.04 4.13
21 ⁄ 2 2.5000 2.4459 2.4008 2.4098 0 37 4.49 4.60
25 ⁄ 8 2.6250 2.5709 2.5258 2.5348 0 35 4.97 5.08
23 ⁄ 4 2.7500 2.6959 2.6508 2.6598 0 34 5.48 5.59
27 ⁄ 8 2.8750 2.8209 2.7758 2.7848 0 32 6.01 6.13
3 3.0000 2.9459 2.9008 2.9098 0 31 6.57 6.69
31 ⁄ 8 3.1250 3.0709 3.0258 3.0348 0 30 7.15 7.28
31 ⁄ 4 3.2500 3.1959 3.1508 3.1598 0 29 7.75 7.89
33 ⁄ 8 3.3750 3.3209 3.2758 3.2848 0 27 8.38 8.52
31 ⁄ 2 3.5000 3.4459 3.4008 3.4098 0 26 9.03 9.18
35 ⁄ 8 3.6250 3.5709 3.5258 3.5348 0 26 9.71 9.86
33 ⁄ 4 3.7500 3.6959 3.6508 3.6598 0 25 10.42 10.57
37 ⁄ 8 3.8750 3.8209 3.7758 3.7848 0 24 11.14 11.30
4 4.0000 3.9459 3.9008 3.9098 0 23 11.90 12.06
41 ⁄ 8 4.1250 4.0709 4.0258 4.0348 0 22 12.67 12.84
41 ⁄ 4 4.2500 4.1959 4.1508 4.1598 0 22 13.47 13.65
43 ⁄ 8 4.3750 4.3209 4.2758 4.2848 0 21 14.30 14.48
41 ⁄ 2 4.5000 4.4459 4.4008 4.4098 0 21 15.1 15.3
45 ⁄ 8 4.6250 4.5709 4.5258 4.5348 0 20 16.0 16.2
43 ⁄ 4 4.7500 4.6959 4.6508 4.6598 0 19 16.9 17.1
47 ⁄ 8 4.8750 4.8209 4.7758 4.7848 0 19 17.8 18.0
5 5.0000 4.9459 4.9008 4.9098 0 18 18.8 19.0
51 ⁄ 8 5.1250 5.0709 5.0258 5.0348 0 18 19.8 20.0
51 ⁄ 4 5.2500 5.1959 5.1508 5.1598 0 18 20.8 21.0
53 ⁄ 8 5.3750 5.3209 5.2758 5.2848 0 17 21.8 22.0
51 ⁄ 2 5.5000 5.4459 5.4008 5.4098 0 17 22.8 23.1
55 ⁄ 8 5.6250 5.5709 5.5258 5.5348 0 16 23.9 24.1
53 ⁄ 4 5.7500 5.6959 5.6508 5.6598 0 16 25.0 25.2
57 ⁄ 8 5.8750 5.8209 5.7758 5.7848 0 16 26.1 26.4
6 6.0000 5.9459 5.9008 5.9098 0 15 27.3 27.5
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