Specification for tubular box spanners.
NORMA vydána dne 31.12.1954
Označení normy: BS 2558:1954
Datum vydání normy: 31.12.1954
Počet stran: 32
Přibližná hmotnost: 96 g (0.21 liber)
Země: Britská technická norma
Kategorie: Technické normy BS
Steels for spanners and tommy bars; hardness figures, performance test. Two grades of spanner. Dimensions: unified precision hexagons, normal series, in BS 1768; Unified black hexagons, heavy series, in BS 1769; Unified machine screw hexagons in BS 1981; precision hexagons B.S.W. and B.S.F. in BS 1083; black hexagons in BS 916; B.A. hexagons in BS 57; Whitworth large hexagons (originally in BS 190, now obsolete); metric hexagons. Status: Confirmed