ASME B 18.6.3 (T33-VI) - 2013 Recess Dimensions for Indented Hex Washer Head Screws，Type VI

Unit:

Thread Size
d

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

0.1250	0.1380	0.1640
40	32	32
0.111	0.132	0.155
T10	T15	T20
0.050	0.055	0.070
0.040	0.045	0.055
0.188	0.250	0.250
0.181	0.244	0.244
0.202	0.272	0.272
0.070	0.093	0.110
0.058	0.080	0.096
0.260	0.328	0.348
0.240	0.302	0.322
0.025	0.025	0.031
0.015	0.015	0.019

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 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.

ASME B 18.6.3 (T33-VI) - 2013 Recess Dimensions for Indented Hex Washer Head Screws，Type VI

JIS B 1189 (Type 1) - 2014

JIS B 1189 (Type 1) - 2005

JIS B 1189 (Class 1) - 1977

NF E 27-711 - 1982

AS /NZS 1427 - 1996

ASME B 18.6.3 (H10A) - 2024

ASME B 18.6.3 (H10B-I) - 2024

ASME B 18.6.3 (H10B-VI) - 2024

ASME B 18.6.3 (T32) - 2013

ASME B 18.6.3 (T33-I) - 2013