Ball Bearing
How the Size for ball bearing is calculated?
What shows the 6305 for skf make ball bearing?
Personally, I look it up in a catalog. The number does have meaning, it is not arbitrary. For your 6305, the 6 means single row deep groove, the 3 is the "diameter series" I don't quite understand what that means, I assume it has something to do with how the outside diameter is related to the inside diameter, the 05 is the code for the inside diameter, in this case, the diameter in mm divided by 5, or a 25mm bore.
The first link in "sources" below is quite informative.
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 Flexten Training Skipping Rope Ball Bearing and Leather  US $9.47
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 HOT NEW 12 Full Extension Ball Bearing Drawer slides pair US $2.60
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 One 1 302 stainless steel bearing ball US $6.00
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 LOT100 BALL BEARING CRANE SWIVEL SOLID RINGS 7 US $.99
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 LOT100 BALL BEARING CRANE SWIVEL SOLID RINGS 5 US $.99
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 LOT100 BALL BEARING CRANE SWIVEL SOLID RINGS 4 US $.99
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 LOT100 BALL BEARING SWIVEL SOLID RINGS 8 US $3.75
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 18 Ball Bearing Hydraulic Soft Close Drawer Slide US $10.95
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 25 X Ball Bearing Swivels in 5 Sizes For all Your Game Fishing NeedsTackle US $.98
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 0LOT100 BALL BEARING SWIVEL SOLID RINGS 6B US $.94
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 VINTAGE DAIWA 7450HRL BALL BEARING FRESHWATER SPINNING REEL Nice US $24.99
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 LOT100 BALL BEARING CRANE SWIVEL SNAP CONNECTOR 12A US $3.99
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 250 S R3ZZ Stainless Ball Bearing 3 16x1 2x196 With 3 16 Dowel Pin US $110.00
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 20 Ball Bearing Hydraulic Soft Close Drawer Slide US $11.95
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 Lot100 BALL BEARING SWIVEL SOLID RINGS 5 US $2.25
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 NEW SKF LBBR 20 LINEAR BALL BEARING 13 16IN BORE 1 1 16IN OD 54954 US $3.99
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DSN Animation: How do ball bearings work?
