What is BS 1790 - Specification for length bars about?
BS 1790 is an International Standard that discusses the technical specifications for length bars and their accessories. BS 1790 relates to length bars of the cylindrical type, in inch sizes up to 48 in, having parallel end faces finished by lapping. Provision is made for two designs of length bar, one with complete plane faces and the other with annular faces surrounding an internally threaded hole at one end or both ends of the bar.
BS 1790 provides for four grades of accuracy, namely reference, calibration, inspection and workshop. BS 1790 specifies general dimensions, tolerances on length and standards of accuracy for flatness, parallelism, and squareness of faces for all grades of bars.
BS 1790 relates to the essential features of design and accuracy of accessories for use with inspection and workshop grade bars. BS 1790 recommends sets of inspection and workshop grade bars and the sources of papers on the refined type of screwed connection.
Who is BS 1790 - Specification for length bars for?
BS 1790 on specification for length bars is useful for:
- Manufacturers of length bars and their accessories
- Steel industries
- Metallurgical engineers
- Metrologists
- Testing authorities
- Regulatory authorities
- Quality assurance personnel
Why should you use BS 1790 - Specification for length bars?
Length bars are used for maintaining traceability. Reference grade bars have completely plane faces and embody the highest order of accuracy as regards both their end faces and the finishing of their actual lengths to their nominal sizes.
Calibration grade bars possess the same degree of perfection in their completely plane end faces as the reference grade bars. They differ only in the somewhat wider tolerances allowed in the adjustment of their lengths to the nominal sizes, which thus permits them to be produced more economically than reference grade bars. Inspection grade bars have internally threaded ends and can thus are used in combination with each other. Workshop grade bars also have internally threaded ends and are used with slip gauges, comparators, and their own accessories for measuring gauges, jigs, workpieces, etc.
BS 1790 provides a general design for reference grade bars, calibration grade bars, inspection grade bars and workshop grade bars that depict a user-friendly idea of length bars. BS 1790 discusses the hardening and stabilizing of length bars that assist users to verify the performance characteristics of length bars which ensure their reliability. BS 1790 specifies protection against climatic conditions which helps users manufacture good quality length bars.
By adopting BS 1790, you can learn more about the specification for length bars and their accessories which can help you to expand your business globally.
