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BS 939:1977

Specification for engineers' squares (including cylindrical and block squares)

Standard Details

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.

General Information

Status : WITHDRAWN
Standard Type: Main
Document No: BS 939:1977
Document Year: 1977
Pages: 22
  • Section Volume:
  • GBM09 Metrology (GMB09)

Life Cycle

Confirmed

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BS 939:1977

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