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Does anyone have any firsthand knowledge of the accepted “standard” or “normal” values to use for radial internal clearances of single row deep groove ball bearings? The table provided in ANSI/ABMA Standard 20-1996 details the radial internal clearances for deep groove ball bearings; however...

Would it be conceivable to expect gas carburized 1020 carbon steel to achieve a case hardness of 15N88 (approximately Rc 56)?

I'm new here so here goes... This is more of a general question regarding weld repair of 355-T6 aluminum castings. Here is a little background; the castings are heat treated to obtain maximum mechanical properties, they are then repaired by welding in order to fill holes and/or correct other...