If a bearing is designated by the number 305, it means that the bearing is of
A. Medium series whose bore is 5 mm
B. Medium series whose bore is 25 mm
C. Light series whose bore is 25 mm
D. Light series whose bore is 5 mm
Answer: Option B
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Multiply last two digits by 5 i.e 05 * 5 = 25 mm.
300 is for medium series.
100 is for extra light series.
200 is for light series.
400 is for heavy series.