I-20A-1 / 20B-1 amatyathanga zombini luhlobo lwe-roller chain, kwaye zihluke kakhulu kwimilinganiselo eyahlukileyo.Phakathi kwabo, i-pitch yegama le-chain ye-20A-1 yi-25.4 mm, ububanzi be-shaft ngu-7.95 mm, ububanzi bangaphakathi bu-7.92 mm, kunye nobubanzi bangaphandle bu-15.88 mm;ngelixa i-pitch yegama ...
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