BS 2558:1954

This standard BS 2558:1954 Specification for tubular box spanners is classified in these ICS categories:

• 25.140.30 Hand-operated tools

This British Standard relates to tubular box spanners suitable for the following hexagon standards or ranges:

BS 1768, Unified precision hexagon bolts, screws, nuts (UNC and UNF threads) and plain washers. Normal series.

BS 1769, Unified black hexagon bolts, screws, nuts (UNC and UNF) and plain washers. Heavy series.

BS 1981, Unified machine screws and machine screw nuts.

BS 1083, Precision hexagon bolts, screws, nuts (BSW and BSF threads) and plain washers.

BS 916, Black bolts and nuts. Hexagon and square, BSW and BSF.

BS 57, B.A. screws, bolts, nuts and plain washers.

Whitworth large hexagons (originally specified in BS 190, now obsolete).

Metric hexagons.

NOTE The spanners specified are also suitable for all the bolt sizes given in BS A102¹⁾ and for all the bolt head and most of the nut sizes used by the petroleum industry and specified in BS 1750²⁾.

The specification includes clauses for material, heat treatment, marking, tests and dimensional details together with requirements for the tommy bars by which the spanners are operated.

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.