BS 4168-5 Hexagon Socket Set Screws with Cup Point

BS 4168-5 specifies metric hexagon socket set screws with a cup point. BSI identifies ISO 4029 as identical to the 1994 edition of this part.

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

Selected cup-point and socket dimensions

Thread d	Socket s (mm)	Cup-point diameter dv max (mm)
M3	1.5	1.4
M6	3	3
M10	5	6
M16	8	10
M24	12	16

Reference note: Selected values in millimetres follow the project ISO 4029 reference schedule, which BSI identifies as identical to BS 4168-5:1994. This is a short reference extract, not the complete dimension and tolerance schedule.