ASME B 18.6.3 (H9B-I) - 2024 Cross Recess Indented Regular and Large Hex Head Screws

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Unit:

Thread Size
d

1#

2#

3#

d	Nominal Size
PP
M	Ref.
Socket No.
P	max
	min
s₁	Regular Head	max
		min
s₂	Large Head	max
		min
e₁	Regular Head	min
e₂	Large Head	min
k	max
	min

0.0730	0.0860	0.0990
64	56	48
0.072	0.086	0.092
0	1	1
0.054	0.054	0.060
0.036	0.036	0.042
0.125	0.125	0.188
0.120	0.120	0.181
/	/	/
/	/	/
0.134	0.134	0.202
/	/	/
0.044	0.050	0.055
0.036	0.040	0.044

①,A slight rounding of all edges and comers of the hex surfaces of indented hex heads shall be permissible, provided the diameter of the bearing circle is equal to no less than 90% of the specified minimum width-across-flats dimension.
②,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.

Alternative history ASME B 18.6.3T30-I - 2013 ASME B 18.6.3H9B - 2024

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