Q: What is the diameter of the outer ring
A: The OD of the Schlage 38-018 626 Satin Chrome Thin Door Spacer = 2-13/16"
Q: Is it compatible with Schlage B60 series?
A: This was designed for a “S” series lock and should not be used on the B60.
Q: I’d like to ask if Schlage 38-018 626 Satin Chrome Thin Door Spacer will fit under Schlage B60 series deadbolt
A: I can say that I've never tried.
The product that you're looking at has a video available within it which may show enough dimensional information to allow you to determine that.
I imagine you have an unusually thin door perhaps, 1-1/4” ?
Q: Will this work with Schlage b62? Trying to replace double cylinder on iron gate but need a spacer bc gate is only 1-1/4”.
A: It is not designed for the be 60 series deadbolts whatsoever and I cannot state if using it as a standalone product would give you the type of success that you are looking for - it does have an outside diameter of 2-13/16" and if that size is compatible with your luck you might buy two of them and hope that they permit you to build the door thickness out enough so as to permit you to install the lock onto that thin gate.
Q: Do you have a thin door spacer that will work with schlage B62 double dead bolt?
A: How thick is your door?
Q: Will these work with F10 and F40 V ACC 619 for 1 1/8 doors?
A: It may though I have never tried. While it is "worth a shot" and I expect you to have a certain amount of success, please note the F series is not intended to work on doors thinner than 1-3/8" and that a restock fee of 35% would be in play should the material need to be returned and is in unused condition.