Machinery's Handbook, 31st Edition
1982
Unified Screw Threads Table 5b. 6-Thread Series, 6-UN and 6-UNR—Basic Dimensions Sizes Minor Diameter
Basic Major Dia., D Inches
Basic Pitch Dia., a D 2 Inches
Lead Angle λ at Basic P.D.
Area of Minor Dia. at D − 2 h b Sq. In. 1.054 1.171
Int. Thds., d D 1
Tensile Stress Area b Sq. In. 1.155 1.277
Ext. Thds., c d 3 (Ref.)
Primary Secondary
Inches
Inches
Inches
Inches Deg. Min.
1.3750 1.2667 1.1766 1.1946 1.4375 1.3292 1.2391 1.2571 1.5000 1.3917 1.3016 1.3196
2 24
e
1 3 ∕ 8
2
17
1 7 ∕ 16
2 11
1.294 1.423 1.56 1.70
1.405 1.54 1.68 1.83
e
1 1 ∕ 2
1.5625 1.4542
1.3641
1.3821
2
5 0
1 9 ∕ 16
1.6250 1.5167 1.4271
1.4446 2
1 5 ∕ 8
1.6875 1.5792 1.4891 1.5071 1.7500 1.6417 1.5516 1.5696 1.8750 1.7667 1.6766 1.6946 1.9375 1.8292 1.7391 1.7571 2.0000 1.8917 1.8016 1.8196 2.1250 2.0167 1.9266 1.9446 1.8125 1.7042 2.2500 2.1417 2.0516 2.0696 2.3750 2.2667 2.1766 2.1946 2.5000 2.3917 2.3016 2.3196 2.7500 2.6417 2.5516 2.5696 2.8750 2.7667 2.6766 2.6946 3.0000 2.8917 2.8016 2.8196 3.1250 3.0167 2.9266 2.9446 2.6250 2.5167
1 1
55 51 47
1 11 ∕ 16
1.85 2.00 2.16 2.33 2.50 2.86 3.25 3.66 4.10 4.56 5.04 5.55 6.09 6.64 7.23 7.84 8.47 9.12 9.81
1.98 2.14 2.30 2.47 2.65 3.03 3.42 3.85 4.29 4.76 5.26 5.78 6.33 6.89 7.49 8.11
1 3 ∕ 4
1.6141 1.6321 1
1 13 ∕ 16
1 43
1 7 ∕ 8
1
40
1 15 ∕ 16
2
1 36
1 1 1
30 25 20
2 1 ∕ 8
2 1 ∕ 4
2 3 ∕ 8
1 16
2 1 ∕ 2
2.4266 2.4446 1 12
2 5 ∕ 8
1
9
2 3 ∕ 4
1 6 1 3
2 7 ∕ 8
3
1
0
3 1 ∕ 8
3.2500 3.1417 3.0516 3.0696 0 58 3.3750 3.2667 3.1766 3.1946 0 56 3.5000 3.3917 3.3016 3.3196 0 54 3.7500 3.6417 3.5516 3.5696 0 50 3.8750 3.7667 3.6766 3.6946 0 48 4.0000 3.8917 3.8016 3.8196 0 47 4.1250 4.0167 3.9266 3.9446 0 45 3.6250 3.5167 3.4266 3.4446 0 52
3 1 ∕ 4
3 3 ∕ 8
8.75 9.42 10.11 10.83 11.57 12.33 13.12 13.94 14.78 15.6 16.5 17.5
3 1 ∕ 2
3 5 ∕ 8
3 3 ∕ 4
10.51 11.24 12.00 12.78 13.58 14.41 15.3 16.1
3 7 ∕ 8
4
4 1 ∕ 8
4.2500 4.1417 4.0516 4.0696 0 4.3750 4.2667 4.1766 4.1946 0 4.5000 4.3917 4.3016 4.3196 0
44 43 42
4 1 ∕ 4
4 3 ∕ 8
4 1 ∕ 2
4.6250 4.5167
4.4266 4.4446
0 40
4 5 ∕ 8
4.7500 4.6417 4.5516 4.5696 0 39 4.8750 4.7667 4.6766 4.6946 0 38 5.0000 4.8917 4.8016 4.8196 0 37 5.1250 5.0167 4.9266 4.9446 0 5.2500 5.1417 5.0516 5.0696 0 35 5.3750 5.2667 5.1766 5.1946 0 35 36
4 3 ∕ 4
17.0 18.0 18.9 19.9 20.9 21.9 23.0 24.0 25.1 26.3
4 7 ∕ 8
5
18.4 19.3 20.3 21.3 22.4 23.4 24.5 25.6 26.8
5 1 ∕ 8
5 1 ∕ 4
5 3 ∕ 8
5.5000 5.3917 5.3016 5.3196 0 5.6250 5.5167 5.4266 5.4446 0 5.7500 5.6417 5.5516 5.5696 0 5.8750 5.7667 5.6766 5.6946 0 6.0000 5.8917 5.8016 5.8196 0
34 33 32 32 31
5 1 ∕ 2
5 5 ∕ 8
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 These are standard sizes of the UNC series.
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