ICS Field
21.120.01 Shafts and couplings in general
21.120.10 Shafts
21.120.20 Couplings
21.120.30 Keys and keyways, splines
21.120.40 Balancing and balancing machines
21.120.99 Other standards related to shafts and couplings
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  6. 21.120 - Shafts and couplings