Posted by DDH Staff on 7/10/2012 to Door Knobs
What is standard for door prepping? We talked all about door thickness in this post, so then what is the standard door prep? The door prep is basically talking about the part where the door hardware goes, you know the holes in the door where you will eventually install the door knob, lever, handleset and/or deadbolt. I am reminding you now that I am talking about standard door prep, that doesn't mean your door can't be prepped differently. Standard prep is the easiest to find replacements for and standard prep is how the door will come if you were to buy a door at home depot or something like that. Starting with an Entrance door, Entrance doors usually have two bore holes. Because it requires a deadbolt above and that goes for if you order a handleset, sideplate or just a basic deadbolt with entrance knob/lever. And the standard bore hole size is 2-1/8 inches in diameter and the cross bore hole is 1 inch diameter. If you measure the standard distance from bore hole to bore hole or the center to center (CC) measurement, it is 5-1/2 inches (there are some other commonly used size CC preps like 3-5/8", 2 7/8" or even 6" CC - so don't think you are at a loss if your door is not standard - call us). You can see where the backset's measurement is shown at the bottom of the image - standard backset is 2-3/8 inches or 2-3/4 inches. This other standard door prep is for basically any other door that does not require a deadbolt lock like a passage, privacy or and keyed entrance function. You will see most of these type of preps on interior doors. It's pretty much the same as the first, 2-1/8 inch diameter bore, 1" cross bore and 2-3/8 inches or 2-3/4 inches backset. If you have standard prep, you can pretty much order any type of hardware you want as most everything easily accommodates the standard prepping, but don't fret if you don't have standard doors, we have hardware for that too! All you have to do is measure then contact us and we can help find what will work on your door whether it's standard or not!