Machinery's Handbook, 31st Edition
1986
Unified Screw Threads Table 5e. 16-Thread Series, 16-UN and 16-UNR—Basic Dimensions Sizes Minor Diameter
Table 5e. (Continued) 16-Thread Series, 16-UN and 16-UNR—Basic Dimensions
Basic Pitch Dia., a D Inches 5.4594 5.5844 5.7094 5.8344 5.9594
Basic Major Dia., D Inches 5.5000 5.6250 5.7500 5.8750 6.0000
Lead Angle λ at Basic P.D. Deg. Min.
Area of Minor Dia. at D − 2 h b
Tensile Stress Area b Sq. In.
Ext. Thds., c d 3 (Ref.)
Int. Thds., d D 1
Primary Secondary
2
Inches
Inches
Inches 5.4255 5.5505 5.6755 5.8005 5.9255
Inches 5.4323 5.5573 5.6823 5.8073 5.9323
Sq. In.
0 0 0 0 0
13 12 12 12 11
23.1 24.1 25.2 26.4 27.5
23.2 24.3 25.4 26.5 27.7
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 or UNF series. Table 5f. 20-Thread Series, 20-UN and 20-UNR—Basic Dimensions Sizes Minor Diameter
Tensile Stress Area b Sq. In. 0.0318 0.0547 0.0836 0.1187 0.160 0.207
Basic Major Dia., D Inches 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 1.5625 1.6250 1.6875 1.7500 1.8125 1.8750 1.9375 2.0000 2.1250 2.2500 2.3750 2.5000 2.6250 2.7500 2.8750 3.0000
Basic Pitch Dia., a D Inches 0.2175 0.2800 0.3425 0.4050 0.4675 0.5300 0.5925 0.6550 0.7175 0.7800 0.8425 0.9050 0.9675 1.0300 1.0925 1.1550 1.2175 1.2800 1.3425 1.4050 1.4675 1.5300 1.5925 1.6550 1.7175 1.7800 1.8425 1.9050 1.9675 2.0925 2.2175 2.3425 2.4675 2.5925 2.7175 2.8425 2.9675
Lead Angle λ at Basic P.D. Deg. Min.
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 0.1905 0.2530 0.3155 0.3780 0.4405 0.5030 0.5655 0.6280 0.6905 0.7530 0.8155 0.8780 0.9405 1.0030 1.0655 1.1280 1.1905 1.2530 1.3155 1.3780 1.4405 1.5030 1.5655 1.6280 1.6905 1.7530 1.8155 1.8780 1.9405 2.0655 2.1905 2.3155 2.4405 2.5655 2.6905 2.8155 2.9405
Inches 0.1959 0.2584 0.3209 0.3834 0.4459 0.5084 0.5709 0.6334 0.6959 0.7584 0.8209 0.8834 0.9459 1.0084 1.0709 1.1334 1.1959 1.2584 1.3209 1.3834 1.4459 1.5084 1.5709 1.6334 1.6959 1.7584 1.8209 1.8834 1.9459 2.0709 2.1959 2.3209 2.4459 2.5709 2.6959 2.8209 2.9459
Sq. In. 0.0269 0.0481 0.0755 0.1090 0.1486 0.194 0.246 0.304 0.369 0.439 0.515 0.598 0.687 0.782 0.882 0.990 1.103 1.222 1.348 1.479 1.62 1.76 1.91
4 3 2 2 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
11 15 40 15 57 43 32 24 16 10 57 53 50 47 45 43 41 39 37 36 34 33 32 31 30 29 5 0 28 26 25 23 22 21 20 19 18
e
1 ∕ 4
5 ∕ 16
3 ∕ 8
e
7 ∕ 16
e
1 ∕ 2
9 ∕ 16
0.261 0.320 0.386 0.458 0.536 0.620 0.711 0.807 0.910 1.018 1.133 1.254 1.382 1.51 1.65 1.80
5 ∕ 8
11 ∕ 16
e
3 ∕ 4
e
13 ∕ 16
e
7 ∕ 8
e
15 ∕ 16
1 e
1 1 ∕ 16
1 1 ∕ 8
1 3 ∕ 16
1 1 ∕ 4
1 5 ∕ 16
1 3 ∕ 8
1 7 ∕ 16
1 1 ∕ 2
1 9 ∕ 16
1.95 2.11 2.27 2.44 2.62 2.80 2.99 3.39 3.81 4.25 4.72 5.21 5.73 6.27 6.84
1 5 ∕ 8
2.07 2.23 2.40 2.57 2.75 2.94 3.33 3.75 4.19 4.66 5.15 5.66 6.20 6.77
1 11 ∕ 16
1 3 ∕ 4
1 13 ∕ 16
1 7 ∕ 8
1 15 ∕ 16
2
2 1 ∕ 8
2 1 ∕ 4
2 3 ∕ 8
2 1 ∕ 2
2 5 ∕ 8
2 3 ∕ 4
2 7 ∕ 8
3
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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