BS 57:1951
$102.76
Specification. B.A. screws bolts and nuts
Published By | Publication Date | Number of Pages |
BSI | 1951 | 22 |
Section 1 of this British Standard specifies requirements and dimensions for both ferrous and non-ferrous screws, bolts and nuts.
Heads: cheese, round, countersunk, raised-countersunk, hexagonal; hexagonal nuts, ordinary and locknut; range No. 0 to No. 16 B.A. Standard lengths of screws.