BS 5204-1:1975

This standard BS 5204-1:1975 Specification for straightedges is classified in these ICS categories:

• 17.040.30 Measuring instruments

This Part of this British Standard specifies requirements for cast iron straightedges of bow shaped design and of I-section in metric sizes. Two grades of accuracy are provided for each type, namely grade A and grade B.

Requirements applicable to both types are given in clauses 3 and 4 and 7 to 14 inclusive while clauses 5 and 6 specify particular requirements relating to bow shaped straightedges in lengths up to and including 8 000 mm and I-section straightedges in lengths up to and including 5 000 mm.

Recommended general dimensions, methods of testing and heat treatments are given in appendices.

NOTE A straightedge complying fully with the requirements of a superseded standard continues to be operational but it should be brought into full association with this standard when convenient, i.e. when the surfaces are reconditioned and/or retested.

Metric sizes in lengths up to 8000 mm bow shaped and 5000 mm I section. Two grades of accuracy for each type, material, manufacture, design. Recommended dimensions and test methods appended.