It's not overly common for a door to be over standard thickness, which is anywhere from 1 3/4" up to 2" thick. Most doors are already prepped this standard thickness and most hardware are made to fit standard prepped doors. This can make it hard for those looking for door hardware to fit over this standard door thickness.
For doors over 2" Standard Thickness:
For those of you that have doors that are thicker than the standard 2" thickness, check out Emtek. They offer door hardware starting from the standard 1 3/4" all the way up to 3" thick! All you have to do is find the door hardware you like and you will be able to select the door thickness you have. We found that it's becoming more and more common for front doors to be a little thicker than standard, because lot's of people have great big fancy front doors on their homes.
For doors over 3" Thick:
A door over 3" thick, is pretty uncommon, but hey... I'm sure there is someone out there looking for some kind of hardware to fit on a really thick door that nobody seems to carry. So if you are looking for any kind of door hardware to fit your door that's over 3" thick, we have this special mechanical lever on the site from Lockey just for you!
The Lockey Lever is a mechanical lock and is also available in double combination.
The lever can fit doors from standard thickness all the way up to 5" thick! I'm thinking not many people (if any) will need a lever to fit a door that is over 5" thick. I guess you never know.
You can choose from many finishes, such as antique brass, bright brass, satin chrome, satin nickel, jet black, white, bright chrome, oil rubbed bronze and a 'special finish' called marine grade.