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Dimensions of Slotted Binding Head Screws (Machine Screws Only) (ASTM F837, F468)

ASME B 18.6.3 (T27) - 2013

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Thread Size
d

0000#

000# ^④

00# ^④

d	Nominal Size
PP
d_k	max
	min
k	max
	min
f	max
	min
n	max
	min
t	max
	min
d₁ ^③	max
	min
h ^③	max
	min

0.0210	0.0340	0.0470	0.0600	0.0730	0.0860	0.0990	0.1120
160	120	90	80	64	56	48	40
0.046	0.073	0.098	0.126	0.153	0.181	0.208	0.235
0.040	0.067	0.090	0.119	0.145	0.171	0.197	0.223
0.014	0.021	0.028	0.032	0.041	0.050	0.059	0.068
0.009	0.015	0.023	0.026	0.035	0.043	0.052	0.061
0.006	0.008	0.011	0.012	0.015	0.018	0.022	0.025
0.003	0.005	0.007	0.008	0.011	0.013	0.016	0.018
0.008	0.012	0.017	0.023	0.026	0.031	0.035	0.039
0.004	0.006	0.010	0.016	0.019	0.023	0.027	0.031
0.009	0.013	0.018	0.018	0.024	0.030	0.036	0.042
0.005	0.009	0.012	0.009	0.014	0.020	0.025	0.030
/	/	/	0.098	0.120	0.141	0.162	0.184
/	/	/	0.086	0.105	0.124	0.143	0.161
/	/	/	0.007	0.008	0.010	0.011	0.012
/	/	/	0.002	0.003	0.005	0.006	0.007

Thread Size
d

10#

12#

1/4

5/16

3/8

d	Nominal Size
PP
d_k	max
	min
k	max
	min
f	max
	min
n	max
	min
t	max
	min
d₁ ^③	max
	min
h ^③	max
	min

0.1250	0.1380	0.1640	0.1900	0.2160	0.2500	0.3125	0.3750
40	32	32	24	24	20	18	16
0.263	0.290	0.344	0.399	0.454	0.525	0.656	0.788
0.249	0.275	0.326	0.378	0.430	0.498	0.622	0.746
0.078	0.087	0.105	0.123	0.141	0.165	0.209	0.253
0.069	0.078	0.095	0.112	0.130	0.152	0.194	0.235
0.029	0.032	0.039	0.045	0.052	0.061	0.077	0.094
0.021	0.024	0.029	0.034	0.039	0.046	0.059	0.071
0.043	0.048	0.054	0.060	0.067	0.075	0.084	0.094
0.035	0.039	0.045	0.050	0.056	0.064	0.072	0.081
0.048	0.053	0.065	0.077	0.089	0.105	0.134	0.163
0.035	0.040	0.050	0.060	0.070	0.084	0.108	0.132
0.205	0.226	0.269	0.312	0.354	0.410	0.513	0.615
0.180	0.199	0.236	0.274	0.311	0.360	0.450	0.540
0.014	0.015	0.017	0.020	0.023	0.026	0.032	0.039
0.009	0.010	0.012	0.015	0.018	0.021	0.027	0.034

②,Break sharp edge on head where spherical and conical surfaces meet.
③,Unless otherwise specified by purchaser, slotted binding head machine screws shall not be undercut.
⑤,The diameter of body on machine screws having other than trim heads shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread.
⑥,Machine Screw Length of Thread 1) Sizes No.5 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in. 2) Sizes No.6 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.

Alternative history

ANSI/ASME B 18.6.3 - 2010 ASME B 18.6.3T27 - 2013

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