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Specification for tubular box spanners.
STANDARD published on 31.12.1954
Designation standards: BS 2558:1954
Publication date standards: 31.12.1954
SKU: NS-61941
The number of pages: 32
Approximate weight : 96 g (0.21 lbs)
Country: British technical standard
Category: Technical standards 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
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