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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.
| Author | BSI |
|---|---|
| Editor | BSI |
| Document type | Standard |
| Format | File |
| Confirmation date | 2016-06-01 |
| EAN ISBN | 0 580 34580 7 |
| ICS | 25.140.30 : Hand-operated tools
|
| Number of pages | 32 |
| Cross references | ISO 2236 |
| Modified by | PD 2150 published March 1955 effective March 1955 Free of charge incorporated |
| Year | 1950 |
| Country | United Kingdom |
| Keyword | Supplement No. 1 (1968) to BS 2558:1954;BS 2558:Supplement 1:1968 |