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Unit:inch

Screwd Studs - UNC Thread [Table 4]

BS 2693-1 - 1956

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英标BS 2693-1 - 1956 BS2693-1 2693-1BS Screwd Studs - UNC Thread [Table 4]
Screw Thread
d
1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2
PP
Major diameter max
min
Effective diameter max
min
Minor diameter max
min
L min b1=d
b1=1.5d
D
20 18 16 14 13 12 11 10 9 8 7 7 6 6
0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000
0.2419 0.3038 0.3656 0.4272 0.4891 0.5511 0.6129 0.7371 0.8611 0.9850 1.1086 1.2336 1.3568 1.4818
0.2201 0.2793 0.3375 0.3945 0.4537 0.5122 0.5700 0.6893 0.8074 0.9239 1.0375 1.1627 1.2723 1.3975
0.2172 0.2762 0.3343 0.3911 0.4500 0.5084 0.5660 0.6850 0.8028 0.9188 1.0322 1.1572 1.2667 1.3917
0.1913 0.2472 0.3014 0.3533 0.4093 0.4641 0.5175 0.6316 0.7433 0.8517 0.9550 1.0802 1.1761 1.3013
0.1849 0.2402 0.2936 0.3447 0.4000 0.4542 0.5069 0.6200 0.7306 0.8376 0.9393 1.0644 1.1581 1.2832
7/8 1-1/8 1-3/8 1-5/8 1-3/4 2 2-1/4 2-5/8 3-1/8 3-1/2 4 4-1/2 4-3/4 5-1/4
1 1-1/4 1-1/2 1-3/4 2 2-1/4 2-1/2 3 3-1/2 4 4-1/2 5 5-1/2 6
1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2
①,The length of thread on the nut end of the stud shall not include the run-out threads and shall be equal to twice the nominal diameter of the thread, except in the case of short studs where this would result in a length of plain portion less than 1/ 2 D. In such cases a length of plain portion equal to 1/ 2 D should be allowed for before threading the remainder for the nut end.
②,Metal end (b1):
i) The length of the thread on the metal end of the stud shall include the run-out threads and shall be equal to the nominal diameter of the thread or to one and a half times the nominal diameter of the
thread, as specified by the purchaser.
ii) The length of thread run-out shall be not less than 2 pitches or more than 2-1/2 pitches.
iii) The tolerance on the length of the thread shall be plus or minus 1/32 in., or plus or minus half a pitch, whichever is the greater.
③,Ends of studs:
a) Metal end: The metal end of the stud shall be finished with a flat chamfer with a 90° included angle to a depth slightly exceeding the depth of thread.
b) Nut end: The nut end of the stud (except studs with Unified threads) shall be finished with a radius approximately equal to 11/ 4 times the nominal diameter. Unified threads shall have a shallow dog point machined on the nut end.
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