Applies to three types of metric series length bars, each having flat parallel measuring faces, in sizes up to 1200 mm. It covers bars of circular, square, and rectangular cross-section. Provision is made for four grades of accuracy, viz Grade 00; Grade 0; Grade 1; Grade 2. The intended use of these grades of accuracy and notes on the care and general use of length bars are given in Clause 1.4 and Appendix A respectively. Requirements for materials, finish, size of section, and tolerance on length, parallelism, flatness and squareness are specified. Requirements for length bar accessories are also given.
