Door knobs

[minifhncc]

Hi,

What is the difference between "Cylindrical" and "Tie bolt" types of door knobs?

Thanks

[I Pik U]

Never heard of a tie bolt type of lock, so I looked it up:
"This lock is a normal handle lock with a Tie bolt drive, That simply means it uses a square shaft to operate the lock, The benefit of this lock is that is only requires 4 screws to install the lock to the door, once the holes have been drilled"

Cylindrical looks have a larger round central body, and need a full size 2 1/8" hole in the door, and often only need 4 screws as well, whereas the type that use just a square shaft to turn the latch can fit in a smaller hole.

[cledry]

I have never heard the term either and have been a locksmith for about 28 years. It might be a regional term. Anyway the door prep is normally the same here in the US a 2 1/8" bore for either lock type. Common "tie bolt" locks would be the older Weiser locks and your cheap imports like Defiant.