Chamberlain/Security Plus chain size?

[JohnnyK81]

Allo! Does anyone have the slightest clue what size of chain/sprocket would be on a standard Chamberlain garage door opener (Security Plus) I think from about 1999. 1/2hp.

I assumed it was #41 (Which I have just found out is smaller than #40?) due to the 1/2" Pitch, however, the width of the #41 is FAR too wide to go on the chain. The distance between the links on this chain is only about 0.135. I cannot seem to find anything to match it (And of course, buying a sprocket and hub now will prove impossible since it isn't one of the regulars).

Thanks guys!

 

[kbs2244]

I have always just used bicycle chain.
The bike shop guy says I am not the only one.

 

[JohnnyK81]

I am trying to find sprocket size though (or I guess I should say, the chain size, so I can get a matching sprocket with the correct weld-on bore.)

I looked up bike chains earlier and none seemed to match the chain I had.

 

[Jrad235]

I'm fairly certain the chain is #48, if I recall that is what the masterlinks are for the Chamberlain/LiftMaster.