BS 4168-4 Hexagon Socket Set Screws with Dog Point

BS 4168-4 covers metric hexagon socket set screws with a dog point. BSI identifies ISO 4028 as identical to the 1994 edition of this part.

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

Selected dog-point dimensions

Thread d	Dog-point diameter dp (mm)	Dog-point length t (mm)	Socket s (mm)
M3	2	1.2	1.5
M6	4	2	3
M10	7	4	5
M16	12	6.4	8
M24	18	10	12

Reference note: Selected values in millimetres follow the project ISO 4028 reference schedule, which BSI identifies as identical to BS 4168-4:1994. This is a short reference extract; verify the exact edition and complete tolerances before manufacture.