Nominal Size or Basic Screw Diameter	Body Diameter		Head Diameter		Head Height		Head Chamfer	Hex Socket Size	Key Engagement	Wall Thickness	Edge of Head Chamfer	Grip Length	Body Length	Length
	Max	Min	Max	Min	Max	Min	Max	Nom	Min	Min	Max	Max	Min	Under Head
1/4" (0.2500)	0.2500	0.2435	0.375	0.365	0.250	0.244	0.025	3/16 (0.188)	0.120	0.095	0.010	1.50	1.25	2-1/2
SEE NOTES 1	2, 15		3				4	20			6	14	15	9 , 10 , 11