BS 450 Pan Head Screws

Nom. Size of Screw	Basic Dia. D	Threads per Inch		Dia. of Head A		Depth of Head B		Width of Slot H		Depth of Slot J
Nom. Size of Screw	Basic Dia. D	BSW	BSF	Max.	Min.	Max.	Min.	Max.	Min.	Depth of Slot J
BS 450 - 1⁄8	0.125	40	...	0.245	0.231	0.075	0.065	0.039	0.032	0.04
BS 450 - 3⁄16	0.1875	24	32c	0.373	0.375	0.11	0.099	0.05	0.042	0.061
BS 450 - 7⁄32	0.2188	...	28c	0.425	0.407	0.125	0.112	0.055	0.046	0.069
BS 450 - 1⁄4	0.25	20	26	0.492	0.473 e	0.144	0.13	0.061	0.051	0.078
BS 450 - 5⁄16	0.3125	18	22	0.615	0.594	0.178	0.162	0.071	0.061	0.095
BS 450 - 3⁄8	0.375	16	20	0.74	0.716	0.212	0.195	0.082	0.072	0.112
BS 450 - 7⁄16	0.4375	14	18	0.863	0.838	0.247	0.227	0.093	0.082	0.129
BS 450 - 1⁄2	0.5	12	16	0.987	0.958	0.281	0.26	0.104	0.092	0.145
BS 450 - 9⁄16	0.5625	12c	16c	1.031	0.999	0.315	0.293	0.115	0.103	0.162
BS 450 - 5⁄8	0.625	11	14	1.125	1.09	0.35	0.325	0.126	0.113	0.179
BS 450 - 3⁄4	0.75	10	12	1.25	1.209	0.419	0.39	0.148	0.134	0.213
a All dimensions, except J, given for the 18-through 38-inch sizes also apply to all the 90° Raised Countersunk Head Screw dimensions given in the Standard. b These screws are also available with recessed heads; recess are not given here but may be found in the Standard. c Non-preferred size; avoid use whenever possible. d By arrangement may also be 0.309. e By arrangement may also be 0.468. All dimensions in inches.