Sprockets

A sprocket has to match your chain on two counts before anything else matters: the ANSI series and the bore. We stock ANSI 50 and 60 series sprockets in finished-bore and weld-on configurations, with hardened teeth and single strand construction, for hangar door drive systems.

Sprocket specifications

The series number is the chain, not the sprocket. ANSI 50 chain runs a 5/8 in. pitch and ANSI 60 runs 3/4 in. Match the series to the chain already on your door and the pitch takes care of itself.

Finished bore or weld on

A finished bore sprocket arrives machined to a specific shaft size with a set screw to lock it in place, so it goes straight onto the shaft with no further work. Our 12 and 15 tooth sprockets come this way in 1-1/4 in. and 1-3/4 in. bores. The 36 tooth sprockets are X series weld-on hubs with a 2 in. bore, intended to be welded to a driven component rather than pinned to a shaft. Which one you need is determined by how the original was mounted, so look at what is coming off the door before you order.

Tooth count and drive ratio

Tooth count sets the ratio between the drive and the driven component, which changes both the speed the door travels and the torque available to move it. Fewer teeth on the drive sprocket means more torque and slower travel; more teeth means faster travel and less torque. This is why swapping in a different tooth count to solve a fitment problem tends to create a second problem. Match the tooth count to what came off unless you are deliberately changing the drive characteristics and know what the operator can handle.

Hardened teeth and single strand

All of these sprockets use hardened teeth, which matters on a hangar door because the drive runs under high load at low speed, and that combination wears soft teeth quickly. Single strand construction matches the standard chain on most hangar door drive systems. If your door runs double strand, call us before ordering.

Hangar door sprockets: common questions