🔐 UNDERSTANDING DOOR BACKSET MONTREAL– 2 3/8″ vs 2 3/4″ 🔐

Many clients don’t realize that when installing or replacing a lock, one small detail makes a big difference: the backset.

👉 What is a backset?
The backset is the distance from the edge of the door to the center of the hole where the lock or handle is installed.

📏 THE TWO STANDARD SIZES

✔ 2 3/8″ (60mm)
‱ Most common on residential doors
‱ Used in homes, condos, apartments
‱ Typical for standard knob or lever locks

✔ 2 3/4″ (70mm)
‱ Common on commercial doors
‱ Found in offices, storefronts, and heavy-duty doors
‱ Provides better spacing for larger hardware and stronger doors

⚠ WHY IT MATTERS

Installing the wrong backset can cause:
‱ Misaligned locks
‱ Difficulty closing or latching
‱ Weak security or improper installation
‱ Extra labor or door modifications

Some locks are adjustable, but not all — especially in commercial applications.

🏱 RESIDENTIAL vs COMMERCIAL

🏠 Residential doors usually come pre-drilled for 2 3/8″
🏬 Commercial doors often require 2 3/4″ for proper hardware fit

Before changing a lock, always verify the backset to avoid problems.

đŸ› ïž PRO TIP FROM A LOCKSMITH

If you’re upgrading to high-security locks (Medeco, Mul-T-Lock, Abloy), or installing commercial-grade hardware, the correct backset is critical for performance and durability.

📞 NEED HELP? WE’VE GOT YOU COVERED
Whether it’s residential or commercial, we make sure everything is installed correctly the first time.

📧 info@serruriermontreal.com
📞 514-836-9097

⚠ Disclaimer:
Information provided is for general education purposes. Always verify door specifications and hardware compatibility before installation.