BS 5317:1976

Cylindrical length bars up to 1200 mm. Accuracy standards for 4 grades, reference, calibration, 1 and 2, and details of screwed connections. Essential features of design and accuracy for accessories commonly used with Grade 2 bars.

This British Standard relates to length bars (end standards) of the cylindrical type having flat, parallel end faces finished by lapping in metric sizes up to 1 200 mm.

NOTE If longer bars are required they should be uniform in diameter and straight overall to the limits laid down in 8.1 and 8.2; tolerances for flatness and parallelism of faces should be proportionate to those specified in the appropriate Table 1 to Table 4 and their lengths should comply with the requirements of 8.4.2.

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.

Section 2 provides for length bars in four grades of accuracy, namely reference, calibration, grade 1 and grade 2. It gives general dimensions, tolerances on length and requirements for flatness, parallelism and squareness of faces for all grades of bars.

Manufacturers supply single length bars or sets of selected sizes.

Section 3 relates to the essential features of design and accuracy of accessories for use with grade 1 or grade 2 bars.

Appendix A deals with interchangeability between these bars and bars made in accordance with BS 1790.