AMEC 40BB18H is a ball-bearing idler sprocket for 40-chain drives, featuring 18 teeth and hardened teeth for wear resistance. It accepts a bore of 0.638 in (about 5/8 in), provides an outside diameter of 3.140 in (3-1/16 in), and has a hub length of 0.720 in with an approximate weight of 0.53 lb. The hub is Type C, and the body is carbon steel, engineered to rotate on a ball-bearing arrangement. The tooth width is about 0.284 in, aligning with a 40 chain pitch and making this sprocket a precise idle component in 40-chain drive systems where durable, accurate alignment is important.
