The standard thickness for a door is 1 3/8", but they can range anywhere from 1" to 2 1/4".
The standard size for a door knob diameter is either 2 3/8 inches or 2 3/4 inches and these knobs will usually fit doors that are anywhere between 1 3/8 inches to 1 3/4 inches thick.
The BHMA/ANSI has three, separate grades for deadbolts, simply labeled grades 1 through 3. Grade 1 is the highest quality, and the most dependable deadbolt you can have. Grade 3 is your average deadbolt which will provide an accepted, but minimal, level of security.
External doors: External doors are generally thicker than internal doors, ranging from 44mm (1.73 inches) to 54mm (2.13 inches) or even more in some cases. The increased thickness is necessary to provide better security, weather resistance, and insulation for the building's exterior.
The typical US new entry door is 1 3/4” to 2” thick. The Conservation Construction doors are 2.5” thick for better insulation, energy efficiency, and durability. Your door can look like real wood or you can choose a more modern front door look with Conservation Construction.
Most exterior doors have a thickness of 1.75", which is considered the standard thickness to help keep your home secure and make sure your door is able to hold up against weather events. For context, the standard thickness for interior doors is about 1.38".
The door's thickness should be between 1-3/8 and 1-3/4 inches. Most deadbolts fit doors in this range.
It is possible to install a deadbolt on an interior door. You'll follow the same process that you would for an exterior door. Just keep in mind that most interior doors, especially hollow-core doors, are not as strong as exterior doors and therefore do not offer the same level of security.
ADA Requirements:
ADA requires that door and gate hardware including handles, pulls, latches, locks and other operable parts comply with Operable Parts. (309.4 and 404.2. 7). 309.4 Operation. Operable parts shall be operable with one hand and shall not require tight grasping, pinching, or twisting of the wrist.
Standard Door Thicknesses
The most common thickness of an internal door is 35-40mm, but some fire doors go up to 54mm.
Strength and durability
A good solid front door should be 40mm thick and an internal one 35mm. Thicker, heavyweight doors offer better protection against damage and impact while making you as an individual feel safe and secure.
The Albasia core used in the manufacture of our solid doors comes in three (3) standard thicknesses; 28mm (core for a 35mm solid core door) 33mm (core for a 40mm solid core door) 38mm (core for a 45mm solid core door)
Replacement doors should have the same measurements as old doors. 1 3/8 inches is the most common depth, but other depths are available. Standard widths include 18, 20, 24, 28, 30, 32 and 36 inches. Standard heights include 80, 84 and 96 inches.
Basic Cylinder Locks
Deadbolts use a solid piece of metal to secure the door, while standard cylinder locks use a spring to help make it easier to lock the door. Unfortunately, the spring does not provide much security and it can easily be forced. Deadbolts, however, are still vulnerable to lock picking.
Having a deadbolt on the entrance to your home will take a standard door knob lock to the next level. Forced entry is involved in 55.7 percent of burglaries, and a deadbolt will make breaking down a door remarkably more challenging.
Instead of having a thumb latch like a deadbolt, when in deadlock mode, this lock requires a key to be used on both the exterior and interior sides. This means that during an emergency, it may add additional seconds to your exit time when you have to find the key and unlock the mechanism on the door.
In the United States, there are two common backsets for residential door locks: 2-3/8 inches. 2-3/4 inches.
Electronic lock doors cannot always be installed on a door thinner than 30 mm and thicker than 65 mm. Although some locks go for a thickness of no more than 50 mm. And for doors 80-100 mm, it is necessary to replace some elements of the lock and fasteners.
Trim rings or extension collars can be used to fit door hardware on unusually thin doors, making it possible to install your desired hardware on the door you already have. It's most common to fit these collars on keyless locks and deadbolts, but there are some outlier options for other types of hardware.
Exterior doors are typically 1-3/4″ thick, are constructed to withstand the outdoor elements and provide security and insulation between the inside and outside temperature differences. Exterior door frames include weather strip and a sill to make them energy efficient.
Standard steel doors are classified in four levels: Level 1 – 1-3⁄4″ and 1-3⁄8″ standard duty, Level 2 – 1-3⁄4″ heavy duty, Level 3 – 1-3⁄4″ extra heavy duty and Level 4 – 1-3⁄4″ maximum duty.