Threads and Threading - Sportpilot.info

Machinery's Handbook 27th Edition
UNIFIED SCREW THREADS 1767
Table 5b. 6–Thread Series, 6–UN and 6–UNR—Basic Dimensions
Sizes
Basic
Major
Dia.,
D
Basic
Pitch
Dia., a
D2 Minor Diameter
Lead
Angle λ
at Basic
P.D.
Area of
Minor
Dia. at
D − 2hb Tensile
Stress
Areab Primary Secondary
Ext.
Thds., c
Int.
Thds.,
d3 (Ref.)
d
D1 Inches Inches Inches Inches Inches Inches Deg. Min. Sq. In. Sq. In.
13 ⁄ e
8 1.3750 1.2667 1.1766 1.1946 2 24 1.054 1.155
17 ⁄ 16 1.4375 1.3292 1.2391 1.2571 2 17 1.171 1.277
11 ⁄ e
2 1.5000 1.3917 1.3016 1.3196 2 11 1.294 1.405
19 ⁄ 16 1.5625 1.4542 1.3641 1.3821 2 5 1.423 1.54
15 ⁄ 8 1.6250 1.5167 1.4271 1.4446 2 0 1.56 1.68
111 ⁄ 16 1.6875 1.5792 1.4891 1.5071 1 55 1.70 1.83
13 ⁄ 4 1.7500 1.6417 1.5516 1.5696 1 51 1.85 1.98
113 ⁄ 16 1.8125 1.7042 1.6141 1.6321 1 47 2.00 2.14
17 ⁄ 8 1.8750 1.7667 1.6766 1.6946 1 43 2.16 2.30
115 ⁄ 16 1.9375 1.8292 1.7391 1.7571 1 40 2.33 2.47
2 2.0000 1.8917 1.8016 1.8196 1 36 2.50 2.65
21 ⁄ 8 2.1250 2.0167 1.9266 1.9446 1 30 2.86 3.03
21 ⁄ 4 2.2500 2.1417 2.0516 2.0696 1 25 3.25 3.42
23 ⁄ 8 2.3750 2.2667 2.1766 2.1946 1 20 3.66 3.85
21 ⁄ 2 2.5000 2.3917 2.3016 2.3196 1 16 4.10 4.29
25 ⁄ 8 2.6250 2.5167 2.4266 2.4446 1 12 4.56 4.76
23 ⁄ 4 2.7500 2.6417 2.5516 2.5696 1 9 5.04 5.26
27 ⁄ 8 2.8750 2.7667 2.6766 2.6946 1 6 5.55 5.78
3 3.0000 2.8917 2.8016 2.8196 1 3 6.09 6.33
31 ⁄ 8 3.1250 3.0167 2.9266 2.9446 1 0 6.64 6.89
31 ⁄ 4 3.2500 3.1417 3.0516 3.0696 0 58 7.23 7.49
33 ⁄ 8 3.3750 3.2667 3.1766 3.1946 0 56 7.84 8.11
31 ⁄ 2 3.5000 3.3917 3.3016 3.3196 0 54 8.47 8.75
35 ⁄ 8 3.6250 3.5167 3.4266 3.4446 0 52 9.12 9.42
33 ⁄ 4 3.7500 3.6417 3.5516 3.5696 0 50 9.81 10.11
37 ⁄ 8 3.8750 3.7667 3.6766 3.6946 0 48 10.51 10.83
4 4.0000 3.8917 3.8016 3.8196 0 47 11.24 11.57
41 ⁄ 8 4.1250 4.0167 3.9266 3.9446 0 45 12.00 12.33
41 ⁄ 4 4.2500 4.1417 4.0516 4.0696 0 44 12.78 13.12
43 ⁄ 8 4.3750 4.2667 4.1766 4.1946 0 43 13.58 13.94
41 ⁄ 2 4.5000 4.3917 4.3016 4.3196 0 42 14.41 14.78
45 ⁄ 8 4.6250 4.5167 4.4266 4.4446 0 40 15.3 15.6
43 ⁄ 4 4.7500 4.6417 4.5516 4.5696 0 39 16.1 16.5
47 ⁄ 8 4.8750 4.7667 4.6766 4.6946 0 38 17.0 17.5
5 5.0000 4.8917 4.8016 4.8196 0 37 18.0 18.4
51 ⁄ 8 5.1250 5.0167 4.9266 4.9446 0 36 18.9 19.3
51 ⁄ 4 5.2500 5.1417 5.0516 5.0696 0 35 19.9 20.3
53 ⁄ 8 5.3750 5.2667 5.1766 5.1946 0 35 20.9 21.3
51 ⁄ 2 5.5000 5.3917 5.3016 5.3196 0 34 21.9 22.4
55 ⁄ 8 5.6250 5.5167 5.4266 5.4446 0 33 23.0 23.4
53 ⁄ 4 5.7500 5.6417 5.5516 5.5696 0 32 24.0 24.5
57 ⁄ 8 5.8750 5.7667 5.6766 5.6946 0 32 25.1 25.6
6 6.0000 5.8917 5.8016 5.8196 0 31 26.3 26.8
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 series.
Copyright 2004, Industrial Press, Inc., New York, NY