BS 4168-2 Hexagon Socket Set Screws with Flat Point

BS 4168-2 covers metric hexagon socket set screws with a flat point. BSI identifies ISO 4026 as identical to BS 4168-2:1994.

Technical line drawing of a hexagon socket set screw with flat point, showing thread diameter, length, socket and point.

Selected flat-point and socket dimensions

Thread d	Socket s (mm)	Flat-point diameter dp max (mm)
M3	1.5	2
M6	3	4
M10	5	7
M16	8	12
M24	12	18

Reference note: Selected values in millimetres follow the project ISO 4026 reference schedule, which BSI identifies as identical to BS 4168-2:1994. Values are a short reference extract, not a complete screw-length or tolerance schedule; check the exact edition before manufacture.