(1) Crowned tooth allowed larger tolerance in shafts and higher loads.
(2) Special hardening treatment W/high strength and anti-abrasiveness.
(3) Closed type coupling--easy lubricate & anti dust ...
(1) NO-LUBRICATION REQUIRED: No lubricants are needed and no noises or wear and tear produced because there is no sliding or friction. (2) MAINTENANCE-FREE: ”LEAVE IT FOR GOOD AFTER INSTALL...