BS 4168 Bright Square Head Set Screws With Flat Chamfered Ends

Nominal Size and Max. Dia., Inches	Number of Threads per Inch		No. 1 Standard		No. 2 Standard		No. 3 Standard
	Number of Threads per Inch		Width Across Flats A	Depth of Head B	Width Across Flats C	Depth of Head D	Width Across Flats E	Depth of Head
	BSW	BSF	Width Across Flats A	Depth of Head B	Width Across Flats C	Depth of Head D	Width Across Flats E	Depth of Head
BS 4168 - 1⁄4	20	26	0.25	0.25	0.313	0.25	0.375	0.25
BS 4168 - 5⁄16	18	22	0.313	0.313	0.375	0.313	0.438	0.313
BS 4168 - 3⁄8	16	20	0.375	0.375	0.438	0.375	0.5	0.375
BS 4168 - 7⁄16	14	18	0.438	0.438	0.5	0.438	0.625	0.438
BS 4168 - 1⁄2	12	16	0.5	0.5	0.563	0.5	0.75	0.5
BS 4168 - 5⁄8	11	14	0.625	0.625	0.75	0.625	0.875	0.625
BS 4168 - 3⁄4	10	12	0.75	0.75	0.875	0.75	1	0.75
BS 4168 - 7⁄8	9	11	0.875	0.875	1	0.875	1.125	0.875
BS 4168 - 1	8	10	1	1	1.125	1	1.25	1
* Depth of Head B, D and F same as for Width Across Flats, No. 1 Standard. Dimensions A, B, C, D, E, and F are in inches.