BS ISO 3290-2-2014 pdf download.Rolling bearings-Balls Part 2: C eramic balls. Measurement of surface roughness shall be carried out in accordance with ISO 4288. NOTE 1 LimIts and measuring methods for waviness are subject to agreement between the customer and supplier. NOTE 2 Local inhomogeneities in colour. densilication, pressing defects, snowflakes. etc. and cracks inherent to the material and its processing are subject to agreement between the customer and supplier. NOTE 3 Local defects originating from machining and handling are subject to agreement between the customer and supplier. 5.3 Sorting accuracy and ball gauges Table 3 comprises the applicable values for — variation of ball lot diameter, — gauge interval, — preferred gauges, — subgauge interval, and — subgauges. 6 Material The balls shall be manufactured from silicon nitride material in accordance with ISO 26602. 7 Dimensions and tolerances 7.1 General The preferred nominal ball diameters are given in Table 1. Tolerances for form and surface roughness are given in Ta.hlcl. Sorting tolerances and ball gauges are given in Tabk.3. 7.2 Shortened formats for nominal diameter identification 7.2.1 Metric option For purchasing and other general administrative purposes, some users optionally identify nominal metric ball diameters with only three digits following the decimal comma. This option does not identify the diameter with adequate precision for manufacturing purposes and the full long diameter values given in Table 1 with four or five digits following the decimal comma to precisely identify the size shall always be used for gauge and subgauge sorting purposes to avoid any possibility of ambiguity. 7.2.2 Imperial option For purchasing and other general administrative purposes, some users optionally continue to identify nominal ball diameters with imperial exact fraction or decimal sizes which carry no risk of ambiguity. Metric equivalents are sometimes also shown but not used as the primary administrative identifier. If this option is applied, gauge and subgauge diameter tolerances in micrometres shall be added to the imperial nominal reference size or its exact metric equivalent with four or five digits following the decimal comma according to Table]. of this part of ISO 3290, for sorting purposes during manufacturing procedures.BS ISO 3290-2 pdf download.
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