Specification for plain setting rings for use with internal diameter measuring machines. Metric units included-in-kit

Specification for plain setting rings for use with internal diameter measuring machines. Metric units included-in-kit1 Scope 1. 1 This British Standard relates to plain setting rings primarily intended to be used, either singly or in combination, for checking the scales on internal diameter measuring equipment. It provides for a range of metric rings in sizes from 2 mm to 150 mm in three grades of accuracy, viz. Grades AA, A and B NOTE Sizes below 2 mm are not included because it is impracticable to measure them. Requirements are specified for material, hardness and

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