BS 4168-7 Hexagon Socket Shoulder Screws

BS 4168-7 specifies metric hexagon socket shoulder screws. The drawing separates the precision shoulder from the threaded portion to make the main measurement points clear.

Technical line drawing of a hexagon socket shoulder screw with shoulder diameter, shoulder length, thread diameter, thread length and socket references.

Shoulder screw dimensional reference

Feature	Drawing reference	Measurement
Nominal thread diameter	d	Threaded portion
Shoulder diameter	ds	Unthreaded bearing shoulder
Shoulder length	l1	Under-head to shoulder end
Thread length	l2	Threaded section length
Head diameter / height	dk / k	Head envelope
Socket size / depth	s / t	Hexagon drive recess

Reference note: This is a symbolic reference, not a numeric schedule. The public BSI record confirms the product scope and dimensional descriptors but does not expose size-by-size values; consult the specified BS 4168-7 edition before manufacture.