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- Plain setting rings for internal measuring equipment (metric series)
- standard by Standards Australia, 01/01/1970
- Publisher: AS
Covers rings for setting instruments used for precision measurements of internal diameters by two-point or three-point contact methods in diameters from 2 mm to 150 mm. It establishes a series of blank sizes; defines material, its heat treatment and hardness; and specifies finish and accuracy of working surface. Three grades of accuracy are provided for. For inch series rings see AS B294.