ASME B 18.6.3 (H10C) - 2024 Combination Slotted Type I Indented Hex Washer Head Screws [TABLE 2.2.10-3]

Unit:

Thread Size
d

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
40	40	32
0.097	0.105	0.148
1	1	2
0.039	0.043	0.048
0.031	0.035	0.039
0.042	0.049	0.053
0.024	0.028	0.030
0.067	0.076	0.089
0.049	0.058	0.064
0.188	0.188	0.250
0.181	0.181	0.244
0.202	0.202	0.272
0.060	0.070	0.093
0.049	0.058	0.080
0.243	0.260	0.328
0.225	0.240	0.302
0.019	0.025	0.025
0.011	0.015	0.015

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,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.
⑤,The specified minimum slot depths are approximately 10% lower than those for slotted hex washer heads. That portion of the slot depth that penetrates beyond the bottom of the indentation shall not be less than one-third of the minimum slot depth specified.