Click Specification

Mushroom Head Screws with hexalobular slot

ASME B 18.6.3 (T25-VI) - 2013

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Thread Size
d

10#

12#

14#

1/4

16#

18#

d	Nominal Size
PP
Socket No.
M	Ref.
P	max
P	min
d_k	max
d_k	min
k	max
k	min
R	max

0.1380	0.1510	0.1640	0.1900	0.2160	0.2420	0.2500	0.2680	0.2940
32	/	32	24	24	/	20	/	/
T10	T15	T15	T20	T25	T27	T27	T30	T30
0.111	0.132	0.132	0.155	0.178	0.200	0.200	0.221	0.221
0.055	0.045	0.055	0.071	0.090	0.090	0.090	0.085	0.090
0.045	0.035	0.045	0.055	0.070	0.070	0.070	0.070	0.075
0.321	0.352	0.384	0.448	0.511	0.557	0.573	0.609	0.661
0.303	0.333	0.364	0.425	0.487	0.530	0.546	0.580	0.630
0.086	0.094	0.102	0.118	0.134	0.146	0.150	0.159	0.173
0.074	0.081	0.088	0.103	0.118	0.129	0.133	0.141	0.153
0.211	0.231	0.254	0.283	0.336	0.375	0.375	0.410	0.446

Thread Size
d

5/16

20#

24#

3/8

7/16

1/2

9/16

5/8

3/4

d	Nominal Size
PP
Socket No.
M	Ref.
P	max
P	min
d_k	max
d_k	min
k	max
k	min
R	max

0.3125	0.3200	0.3720	0.3750	0.4375	0.5000	0.5625	0.6250	0.7500
18	/	/	16	14	13	12	11	10
T40	T40	T45	T45	T45	T50	T55	T55	T60
0.266	0.266	0.312	0.312	0.312	0.352	0.446	0.446	0.529
0.095	0.100	0.100	0.125	0.155	0.150	0.190	0.190	0.230
0.080	0.085	0.085	0.110	0.130	0.130	0.165	0.165	0.210
0.698	0.713	0.817	0.823	0.948	1.073	1.198	1.323	1.573
0.666	0.680	0.780	0.787	0.907	1.028	1.149	1.269	1.511
0.183	0.186	0.213	0.215	0.248	0.280	0.312	0.345	0.410
0.162	0.165	0.190	0.191	0.221	0.250	0.279	0.309	0.368
0.457	0.484	0.557	0.538	0.619	0.701	0.783	0.863	1.024

①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,Sizes 9/16, 5/8, and 3/4 are for machine screws only.
③,Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only.

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