BS 939-2007 工程角尺(包括圆柱直角规和短形角尺).规范

标准号：BS 939-2007
中文标准名称：工程角尺(包括圆柱直角规和短形角尺).规范
英文标准名称：Engineers’ squares (including cylindrical and block squares) – Specification
标准类型：J42
发布日期：2007/10/31 12:00:00
实施日期：2007/10/31 12:00:00
中国标准分类号：J42
国际标准分类号：17.040.30;25.060.01
引用标准：BS 1134-1;BS EN 1561-1997;BS 3643-1-1981;BS 3643-2-1981
适用范围：This British Standard specifies requirements for engineers’ try squares(excluding adjustable squares), cylindrical squares and block squares ofsolid or open form.Section 1 specifies general requirements applicable to all types ofsquare.Section 2 specifies requirements for engineers’ try squares inthree grades of accuracy, AA, A and B, with inner lengths of bladefrom 50 mm up to and including 1 000 mm.Section 3 specifies requirements for cylindrical squares in accuracygrade AA in sizes from 75 mm up to and including 750 mm.Section 4 specifies requirements for solid form block squares inaccuracy grades AA and A in sizes from 50 mm × 40 mm up to andincluding 1 000 mm × 1 000 mm.Section 5 specifies requirements for open form block squares inaccuracy grades A and B in sizes from 150 mm × 100 mm up to andincluding 600 mm × 400 mm.NOTE While the standard provides for squares in various grades ofaccuracy, it should be noted that their accuracy in use is dependent uponthe flatness of the surfaces on which they are used.