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UNIFIED SCREW THREADS 1771
Table 5e. (Continued) 16–Thread Series, 16–UN and 16–UNR—Basic Dimensions
Sizes
Primary Secondary
Basic
Major
Dia., D
Machinery's Handbook 27th Edition
Basic
Pitch
Dia., a D 2
Minor Diameter
Ext. Thds., c
d 3 (Ref.)
Int. Thds., d
D 1
51 ⁄ 2 5.5000 5.4594 5.4255 5.4323 0 13 23.1 23.2
55 ⁄ 8 5.6250 5.5844 5.5505 5.5573 0 12 24.1 24.3
53 ⁄ 4 5.7500 5.7094 5.6755 5.6823 0 12 25.2 25.4
57 Inches Inches Inches Inches Inches Inches Deg. Min. Sq. In. Sq. In.
⁄ 8 5.8750 5.8344 5.8005 5.8073 0 12 26.4 26.5
6 6.0000 5.9594 5.9255 5.9323 0 11 27.5 27.7
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 diamter.
e These are standard sizes of the UNC or UNF Series.
Table 5f. 20–Thread Series, 20–UN and 20–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.
1
⁄4
e
0.2500 0.2175 0.1905 0.1959 4 11 0.0269 0.0318
5
⁄16 0.3125 0.2800 0.2530 0.2584 3 15 0.0481 0.0547
3
⁄8 0.3750 0.3425 0.3155 0.3209 2 40 0.0755 0.0836
7
⁄16
e 0.4375 0.4050 0.3780 0.3834 2 15 0.1090 0.1187
1
⁄2
e 0.5000 0.4675 0.4405 0.4459 1 57 0.1486 0.160
9
⁄16 0.5625 0.5300 0.5030 0.5084 1 43 0.194 0.207
5
⁄8 0.6250 0.5925 0.5655 0.5709 1 32 0.246 0.261
11
⁄16 0.6875 0.6550 0.6280 0.6334 1 24 0.304 0.320
3
⁄4
e 0.7500 0.7175 0.6905 0.6959 1 16 0.369 0.386
13
⁄16
e 0.8125 0.7800 0.7530 0.7584 1 10 0.439 0.458
7
⁄8
e 0.8750 0.8425 0.8155 0.8209 1 5 0.515 0.536
15
⁄16
e 0.9375 0.9050 0.8780 0.8834 1 0 0.0.598 0.620
1e 1.0000 0.9675 0.9405 0.9459 0 57 0.687 0.711
11 ⁄ 16 1.0625 1.0300 1.0030 1.0084 0 53 0.782 0.807
11 ⁄ 8 1.1250 1.0925 1.0655 1.0709 0 50 0.882 0.910
13 ⁄ 16 1.1875 1.1550 1.1280 1.1334 0 47 0.990 1.018
11 ⁄ 14 1.2500 1.2175 1.1905 1.1959 0 45 1.103 1.133
15 ⁄ 16 1.3125 1.2800 1.2530 1.2584 0 43 1.222 1.254
13 ⁄ 8 1.3750 1.3425 1.3155 1.3209 0 41 1.348 1.382
17 ⁄ 16 1.4375 1.4050 1.3780 1.3834 0 39 1.479 1.51
11 ⁄ 2 1.5000 1.4675 1.4405 1.4459 0 37 1.62 1.65
19 ⁄ 16 1.5625 1.5300 1.5030 1.5084 0 36 1.76 1.80
15 ⁄ 8 1.6250 1.5925 1.5655 1.5709 0 34 1.91 1.95
111 ⁄ 16 1.6875 1.6550 1.6280 1.6334 0 33 2.07 2.11
13 ⁄ 4 1.7500 1.7175 1.6905 1.6959 0 32 2.23 2.27
113 ⁄ 16 1.8125 1.7800 1.7530 1.7584 0 31 2.40 2.44
17 ⁄ 8 1.8750 1.8425 1.8155 1.8209 0 30 2.57 2.62
115 ⁄ 16 1.9375 1.9050 1.8780 1.8834 0 29 2.75 2.80
2 2.0000 1.9675 1.9405 1.9459 0 28 2.94 2.99
21 ⁄ 8 2.1250 2.0925 2.0655 2.0709 0 26 3.33 3.39
21 ⁄ 4 2.2500 2.2175 2.1905 2.1959 0 25 3.75 3.81
23 ⁄ 8 2.3750 2.3425 2.3155 2.3209 0 23 4.19 4.25
21 ⁄ 2 2.5000 2.4675 2.4405 2.4459 0 22 4.66 4.72
25 ⁄ 8 2.6250 2.5925 2.5655 2.5709 0 21 5.15 5.21
23 ⁄ 4 2.7500 2.7175 2.6905 2.6959 0 20 5.66 5.73
27 ⁄ 8 2.8750 2.8425 2.8155 2.8209 0 19 6.20 6.27
3 3.0000 2.9675 2.9405 2.9459 0 18 6.77 6.84
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, UNF, or UNEF Series.
Lead
Angle λ
at Basic P.D.
Area of
Minor Dia.
at D − 2h b
Copyright 2004, Industrial Press, Inc., New York, NY
Tensile
Stress
Area b