Click Specification

Flat Countersunk Head Elevator Bolts [Table9]

ASME B 18.5 - 2012 (2017)

Display drawing:

Thread Size
d

10#

1/4

5/16

3/8

7/16

1/2

PP	UNC
d_s	max
d_s	min
d_k	max
d_k	min
k	max
k	min
s	max
s	min
k₁	max
k₁	min
a	Ref.

24	20	18	16	14	13
0.199	0.260	0.324	0.388	0.452	0.515
0.182	0.237	0.298	0.360	0.421	0.483
0.790	1.008	1.227	1.352	1.477	1.602
0.750	0.969	1.188	1.312	1.438	1.562
0.082	0.098	0.114	0.145	0.176	0.176
0.062	0.078	0.094	0.125	0.156	0.156
0.210	0.280	0.342	0.405	0.468	0.530
0.185	0.245	0.307	0.368	0.431	0.492
0.125	0.219	0.250	0.250	0.281	0.281
0.094	0.188	0.219	0.219	0.250	0.250
9°	9°	9°	11°	13°	12°

①,Minimum Thread Length:
The minimum length of thread shall be equal to twice the basic bolt diameter plus 0.25 in. for nominal bolt lengths of 6 in. or shorter, and twice the basic bolt diameter plus 0.50 in. for longer nominal lengths.
Bolts of nominal lengths too short to accommodate the minimum thread lengths shall be threaded full length. The length from the head or neck to the first complete (full form) thread shall not exceed the length of 2-1/2 threads for sizes up to and including 1 in., and 3-1/2 threads for sizes over 1 in.

Alternative history

ANSI/ASME B 18.5 - 2008 ANSI/ASME B 18.5 - 2012 ASME B 18.5 - 2012(2017)

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