What Is The Standard Deadbolt Hole Size?

Deadbolts are an essential component of home security, providing an extra layer of protection against intruders. But what is the standard deadbolt hole size?

What Is The Standard Deadbolt Hole Size?

The standard deadbolt hole size is 2-1/8 inches (54 mm) in diameter. This size allows for most standard deadbolt locks to be easily installed in residential doors. The hole is typically drilled in the center of the door, at a height of 40 inches (101.6 cm) from the bottom of the door.

In addition to the hole size, it’s also important to consider the backset or the distance from the edge of the door to the center of the hole. Most residential doors have a standard backset of 2-3/8 inches (60 mm) or 2-3/4 inches (70 mm). It’s important to choose a deadbolt lock that matches the backset of the door to ensure proper installation.

It’s also important to choose a deadbolt lock that is well-made and durable, with features such as hardened steel bolts and tamper-resistant screws. A properly installed and high-quality deadbolt lock can provide added security and peace of mind for homeowners.

When installing a deadbolt lock, it’s important to follow the manufacturer’s instructions and use the proper tools and materials. This may include a drill with a 2-1/8 inch hole saw, a hammer, chisel, screwdriver, and screws. It’s also important to ensure that the deadbolt lock is properly aligned and installed securely.

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What Size Hole Do I Drill For A Deadbolt Lock?

The deadbolt lock set will come with a template to help you with measurements. Be sure to use the correct size drill bits specified in the lock set instructions, though most standard deadbolts require a 2 1/8-inch hole saw for the lock bodies and a 1-inch spade bit for the sliding bolt assembly.

Are All Deadbolt Holes The Same Size?

The standard bore is 2-1/8”. Many older doors had bores that were been smaller. Most of the current locks require the standard 2-1/8” bore. If one wants to replace the locks on doors that have smaller diameter holes there are 2 options.

Are All Deadbolts Standard Size?

Most deadbolt assemblies are a standard size, but you’ll need to read the instructions or measure the assembly to choose the correct hole saw bit.

Are Deadbolt And Doorknob Holes The Same Size?

Replacement hardware needs to fit your door, and hardware for a new door requires a hole saw in the correct size. Typically, deadbolts need a borehole 1 1/2 or 2 1/8 inches in diameter. Levers and handle sets usually need a hole 2 1/8 inches in diameter.

What Is The Most Common Deadbolt Size?

The most common door prep uses a two and one-eighth inch cross-bore with a one-inch edge-bore. Another popular installation uses a one and one-half inch cross-bore with a one inch or seven-eighths inch edge-bore.


In conclusion, the standard deadbolt hole size is 2-1/8 inches in diameter, with a standard backset of 2-3/8 inches or 2-3/4 inches. Choosing a well-made and durable deadbolt lock, following proper installation procedures, and ensuring proper alignment and security can help provide added protection for residential doors.


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