Machinery's Handbook, 31st Edition
Studs 1769 British Standard General Purpose Studs BS 2693:Part 1:1956 (obsolescent) Limits for End Screwed into Component (All threads except BA)
Effective Diameter
Minor Diameter
Effective Diameter
Minor Dia.
Max.
Min.
Max.
Min.
Max.
Min.
Min.
Max.
Min.
Max.
Min.
UN THREADS UNC THREADS 1 ∕ 4 0.2500 28 0.2435 0.2294 0.2265 0.2088 0.2037 20 0.2419 0.2201 0.2172 0.1913 0.1849 5 ∕ 16 0.3125 24 0.3053 0.2883 0.2852 0.2643 0.2586 18 0.3038 0.2793 0.2762 0.2472 0.2402 3 ∕ 8 0.3750 24 0.3678 0.3510 0.3478 0.3270 0.3211 16 0.3656 0.3375 0.3343 0.3014 0.2936 7 ∕ 16 0.4375 20 0.4294 0.4084 0.4050 0.3796 0.3729 14 0.4272 0.3945 0.3911 0.3533 0.3447 1 ∕ 2 0.5000 20 0.4919 0.4712 0.4675 0.4424 0.4356 13 0.4891 0.4537 0.4500 0.4093 0.4000 9 ∕ 16 0.5625 18 0.5538 0.5302 0.5264 0.4981 0.4907 12 0.5511 0.5122 0.5084 0.4641 0.4542 5 ∕ 8 0.6250 18 0.6163 0.5929 0.5889 0.5608 0.5533 11 0.6129 0.5700 0.5660 0.5175 0.5069 3 ∕ 4 0.7500 16 0.7406 0.7137 0.7094 0.6776 0.6693 10 0.7371 0.6893 0.6850 0.6316 0.6200 7 ∕ 8 0.8750 14 0.8647 0.8332 0.8286 0.7920 0.7828 9 0.8611 0.8074 0.8028 0.7433 0.7306 1 1.0000 12 0.9886 0.9510 0.9459 0.9029 0.8925 8 0.9850 0.9239 0.9188 0.8517 0.8376 1 1 ∕ 8 1.1250 12 1.1136 1.0762 1.0709 1.0281 1.0176 7 1.1086 1.0375 1.0322 0.9550 0.9393 1 1 ∕ 4 1.2500 12 1.2386 1.2014 1.1959 1.1533 1.1427 7 1.2336 1.1627 1.1572 1.0802 1.0644 1 3 ∕ 8 1.3750 12 1.3636 1.3265 1.3209 1.2784 1.2677 6 1.3568 1.2723 1.2667 1.1761 1.1581 1 1 ∕ 2 1.5000 12 1.4886 1.4517 1.4459 1.4036 1.3928 6 1.4818 1.3975 1.3917 1.3013 1.2832 BS THREADS BSF THREADS BSW THREADS UNF THREADS 1 ∕ 4 0.2500 26 0.2455 0.2280 0.2251 0.2034 0.1984 20 0.2452 0.2206 0.2177 0.1886 0.1831 5 ∕ 16 0.3125 22 0.3077 0.2863 0.2832 0.2572 0.2517 18 0.3073 0.2798 0.2767 0.2442 0.2383 3 ∕ 8 0.3750 20 0.3699 0.3461 0.3429 0.3141 0.3083 16 0.3695 0.3381 0.3349 0.0981 0.2919 7 ∕ 16 0.4375 18 0.4320 0.4053 0.4019 0.3697 0.3635 14 0.4316 0.3952 0.3918 0.3495 0.3428 1 ∕ 2 0.5000 16 0.4942 0.4637 0.4600 0.4237 0.4172 12 0.4937 0.4503 0.4466 0.3969 0.3897 9 ∕ 16 0.5625 16 0.5566 0.5263 0.5225 0.4863 0.4797 12 0.5560 0.5129 0.5091 0.4595 0.4521 5 ∕ 8 0.6250 14 0.6187 0.5833 0.5793 0.5376 0.5305 11 0.6183 0.5708 0.5668 0.5126 0.5050 3 ∕ 4 0.7500 12 0.7432 0.7009 0.6966 0.6475 0.6398 10 0.7428 0.6903 0.6860 0.6263 0.6182 7 ∕ 8 0.8750 11 0.8678 0.8214 0.8168 0.7632 0.7551 9 0.8674 0.8085 0.8039 0.7374 0.7288 1 1.0000 10 0.9924 0.9411 0.9360 0.8771 0.8686 8 0.9920 0.9251 0.9200 0.8451 0.8360 1 1 ∕ 8 1.1250 9 1.1171 1.0592 1.0539 0.9881 0.9792 7 1.1164 1.0388 1.0335 0.9473 0.9376 1 1 ∕ 4 1.2500 9 1.2419 1.1844 1.1789 1.1133 1.1042 7 1.2413 1.1640 1.1585 1.0725 1.0627 1 3 ∕ 8 1.3750 8 1.3665 1.3006 1.2950 1.2206 1.2110 6 1.4906 1.3991 1.3933 1.2924 1.2818 1 1 ∕ 2 1.5000 8 1.4913 1.4258 1.4200 1.3458 1.3360 … … … … … … Limits for End Screwed into Component (BA Threads) a Designa Major Diameter Effective Diameter Minor Diameter 2 0.8100 mm 4.700 mm 4.580 mm 4.275 mm 4.200 mm 3.790 mm 3.620 mm 0.03189 in. 0.1850 in. 0.1803 in. 0.1683 in. 0.1654 in. 0.1492 in. 0.1425 in. 4 0.6600 mm 3.600 mm 3.500 mm 3.260 mm 3.190 mm 2.865 mm 2.720 mm 0.2598 in. 0.1417 in. 0.1378 in. 0.1283 in. 0.1256 in. 0.1128 in. 0.1071 in. a Approximate inch equivalents are shown below the dimensions given in mm. Minimum Nominal Lengths of Studs a tion No. Pitch Max. Min. Max. Min. Max. Min.
For Thread Length (Component End) of
For Thread Length (Component End) of
For Thread Length (Component End) of
Nom. Stud. Dia.
Nom. Stud. Dia.
Nom. Stud Dia.
1 D
1.5 D
1 D
1.5 D
1 D
1.5 D
1
2
4
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
2 3 ∕ 8 2 5 ∕ 8
4 5 ∕ 8 5 1 ∕ 2 5 3 ∕ 4
7 ∕ 8
1 ∕ 4
9 ∕ 16
1 1 ∕ 8 1 3 ∕ 8 1 5 ∕ 8 1 3 ∕ 4
1 3 ∕ 8 1 5 ∕ 8 1 7 ∕ 8
2 1 ∕ 4 2 5 ∕ 8 3 1 ∕ 8 3 1 ∕ 2
4 3 ∕ 4
5 ∕ 16
5 ∕ 8 3 ∕ 4 7 ∕ 8
3
5
3 ∕ 8
6
3 5 ∕ 8
5 1 ∕ 4
7 ∕ 16
1 ∕ 2 … a The standard also gives preferred and standard lengths of studs: Preferred lengths of studs: 7 ⁄ 8 , 1, 1 1 ⁄ 8 , 1 1 ⁄ 4 , 1 3 ⁄ 8 , 1 1 ⁄ 2 , 1 3 ⁄ 4 , 2, 2 1 ⁄ 4 , 2 1 ⁄ 2 , 2 3 ⁄ 4 , 3, 3 1 ⁄ 4 , 3 1 ⁄ 2 and for lengths above 3 1 ⁄ 2 the preferred increment is 1 ⁄ 2 . Standard lengths of studs: 7 ⁄ 8 , 1, 1 1 ⁄ 8 , 1 1 ⁄ 4 , 1 3 ⁄ 8 , 1 1 ⁄ 2 , 1 5 ⁄ 8 , 1 3 ⁄ 4 , 1 7 ⁄ 8 , 2, 2 1 ⁄ 8 , 2 1 ⁄ 4 , 2 3 ⁄ 8 , 2 1 ⁄ 2 , 2 5 ⁄ 8 , 2 3 ⁄ 4 , 2 7 ⁄ 8 , 3, 3 1 ⁄ 8 , 3 1 ⁄ 4 , 3 3 ⁄ 8 , 3 1 ⁄ 2 and for lengths above 3 1 ⁄ 2 the standard increment is 1 ⁄ 4 . All dimensions are in inches except where otherwise noted. See page 2106 for interference-fit threads. 2 1 4 … …
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