ASME B 18.6.3 (H5D) - 2024 Combination Slotted-Pan Head Screws (ASTM F837, F468) [TABLE 2.2.5-4 I/IA/III]

Unit:

Thread Size
d

d
PP
d_k	max
	min
k	max
	min
n	max
	min
t	max
	min
M	Type I
	Type IA
	Type III
P	Type I	Max.
		Min.
	Type IA	Max.
		Min.
	Type III	Max.
		Min.
Drive Size	Type I
	Type IA
	Type III
R	Min.

0.0600	0.0730	0.0860
80	64	56
0.116	0.142	0.167
0.104	0.130	0.155
0.044	0.053	0.062
0.036	0.044	0.053
0.023	0.026	0.031
0.016	0.019	0.023
0.022	0.027	0.031
0.013	0.016	0.020
0.060	0.067	0.097
0.060	0.067	0.097
/	/	0.050
0.032	0.040	0.052
0.014	0.022	0.034
0.033	0.040	0.053
0.017	0.024	0.037
/	/	0.033
/	/	0.028
0	0	1
0	0	1
/	/	00
0.005	0.005	0.010

①,Machine Screw Length of Thread 1) Sizes No.5 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in. 2) Sizes No.6 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.
②,Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10% lower than those for slotted pan heads.