出典:Wiktionary
ball bearing (複数形 ball bearings)
出典:『Wiktionary』 (2014/03/15 23:55 UTC 版)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/10 14:34 UTC 版)
Bearing balls are special highly spherical and smooth balls, most commonly used in ball bearings. The balls come in many different grades, as defined by the American Bearing Manufacturers Association (ABMA), which defines the precision of the balls. They are manufactured in specially designed machines for the job.