AS35 One Way Clutch One Clutch AS35 = NSS35 AS35 is a one-way clutch,that is used for Overrunning, Indexing and Backstopping, this type is non-bearing supported, this is exactly the same size as any 6207 ball bearing, you will need one of the 6207 beairngs to support it, One way Bearing Sprag/Clutch Freewheel and also called as Backstops. AS35 is used in any application that requires one direction rotation, such as mining, hydraulic, textile, printing and washing machines, conveyor systems that carry products to a higher level should not be reversed because of gravity during any power shortage.