BS 939:1977
Specification for engineers' squares (including cylindrical and block squares)

Standard No.

BS 939:1977

Release Date

1977

Published By

British Standards Institution (BSI)

Status

Be replaced 2007-10

Replace By

BS 939:2007

Latest

BS 939:2007

Scope

Squares of try-square type in three grades of accuracy: AA, A, B ; cylindrical squares in grade AA; solid form block squares in grades AA, A; open form block squares in grades A, B. Nomenclature, designation, sizes, material, manufacture, design, accuracy, marking , protection, testing.

BS 939:1977 history

• 2007 BS 939:2007 Engineers’ squares (including cylindrical and block squares) – Specification
• 1977 BS 939:1977 Specification for engineers' squares (including cylindrical and block squares)