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Combination Slotted Type I Indented Hex Washer Head Screws

ASME B 18.6.3 (T34) - 2013

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Thread Size
d

10#

12#

14#

1/4

5/16

3/8

d
PP
M	Ref.
Socket No.
n	max
	min
t	max
	min
P	max
	min
s	max
	min
e	min
h	max
	min
d_c	max
	min
c	max
	min

0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160	0.2420	0.2500	0.3125	0.3750
40	40	32	/	32	24	24	/	20	18	16
0.097	0.105	0.148	0.148	0.168	0.178	0.247	0.277	0.277	0.358	0.386
1	1	2	2	2	2	3	3	3	4	4
0.039	0.043	0.048	0.048	0.054	0.060	0.067	0.075	0.075	0.084	0.094
0.031	0.035	0.039	0.039	0.045	0.050	0.056	0.064	0.064	0.072	0.081
0.042	0.049	0.053	0.053	0.074	0.080	0.103	0.111	0.111	0.134	0.168
0.024	0.028	0.030	0.030	0.048	0.052	0.072	0.078	0.078	0.100	0.161
0.067	0.076	0.089	0.089	0.115	0.127	0.152	0.186	0.186	0.234	0.267
0.049	0.058	0.064	0.064	0.090	0.102	0.127	0.161	0.161	0.210	0.243
0.188	0.188	0.250	0.250	0.250	0.312	0.312	0.375	0.375	0.500	0.562
0.181	0.181	0.244	0.244	0.244	0.305	0.305	0.367	0.367	0.489	0.551
0.202	0.202	0.272	0.272	0.272	0.340	0.340	0.409	0.409	0.545	0.614
0.060	0.070	0.093	0.093	0.110	0.120	0.155	0.190	0.190	0.230	0.295
0.049	0.058	0.080	0.080	0.096	0.105	0.139	0.172	0.172	0.208	0.270
0.243	0.260	0.328	0.328	0.348	0.414	0.432	0.520	0.520	0.676	0.780
0.225	0.240	0.302	0.302	0.322	0.384	0.398	0.480	0.480	0.624	0.720
0.019	0.025	0.025	0.029	0.031	0.031	0.039	0.050	0.050	0.055	0.063
0.011	0.015	0.015	0.017	0.019	0.019	0.022	0.030	0.030	0.035	0.037

①,A slight rounding of all edges and corners of the hex surfaces shall be permissible.
②,Fillet radius, R, at the junction of the sides of the hex and the top of the washer shall not exceed 0.15 times the basic screw diameter.
③,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
④,Sizes 7 and 14 are for tapping screws only.
⑤,The recess depths, slot depths, and penetration given are intended to include the depth of the indentation. Due to possible variations in the indentation depths, there could be variations in these dimensions. In these cases, the requirements are to be as agreed upon between the manufacturer and the purchaser.

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