BS 93:1951

Заменен

Specification for British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A. — 22 стр.

Заменен на

BS 93:2008

ICS

21.040.30 Special. Including miniature screw threads, pipe threads, etc. / Специальные резьбы. Включая мелкие резьбы, трубные резьбы и т.д.