BS 57:1951現行
Specification. B.A. screws bolts and nuts
出版：British Standards Institution
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基本信息
標準編號： BS 57:1951
發布時間：1951/3/31 0:00:00
標準類別：Standard
出版單位：British Standards Institution
標準頁數：22
標準簡介
Heads: cheese, round, countersunk, raised-countersunk, hexagonal; hexagonal nuts, ordinary and locknut; range No. 0 to No. 16 B.A. Standard lengths of screws.
標準備注
? British Standards Institution 2013
Amendment notes:
AMD 1528 published 15 August 1974
PD 4329 published 15 October 1961
PD 5901 published 15 August 1966
替代本標準的新標準
等同采用的國際標準
AS B85-1953 - Identical
