Measuring the Lock Backset | Lock Measurement Guide: The video tutorial explains how to measure the back set of a lock, which is the distance from the edge of the door to the center of the lock. It covers three common sizes: 2 3/8″ and 2 3/4″ and the less common five inches. Mr. Locksmith emphasizes “the importance of measuring correctly to ensure the lock fits properly, highlighting that many issues arise from incorrect measurements.” (Source: Terry Whin-Yates)
Source: Mr. Locksmith Youtube http://www.youtube.com/user/24hrMrLocksmith
Measuring the Lock Backset | Lock Measurement Guide
When it comes to ensuring that locks fit perfectly, especially in both residential and commercial settings, understanding how to measure the backset of a lock is crucial. Whether you’re a professional locksmith, a DIY enthusiast, or someone who’s just curious, mastering this simple yet essential skill can save you time and frustration. Let’s dive into the world of lock measurements, focusing particularly on the backset.
Understanding the LockBackset
Before we get into the actual measuring, let’s clarify what “backset” means. Backset refers to the distance from the edge of the door to the center of the lock (or latch) mechanism. This measurement is vital when installing locks because it determines whether the lock will fit correctly with the existing door setup.
Common Lock Backset Sizes
In North America, there are three standard backset sizes:
- 2 and 3/8 inches
- 2 and 3/4 inches
- 5 inches
Of these, the 2 and 3/8 inches and 2 and 3/4 inches measurements are the most prevalent. The 5-inch size is less common and typically found in older buildings.
Measuring the Lock Backset
Here’s a step-by-step guide to measuring the backset:
- From the Edge to the Center: Begin by measuring from the edge of the door to the center of the lock hole. This direct measurement will give you the backset value.
- Typical Measurements: For most modern buildings, the distance observed will commonly be 2 and 3/4 inches. This is a standard size for many contemporary locks.
- Adjusting Mechanisms: Many locks are adjustable, allowing them to fit either the 2 and 3/8 inches or 2 and 3/4 inches standards. Adjusting these locks might require you to modify the bolt length by moving from the edge of the lock (or latch) to the center, which results in a different measurement.
- The 5-inch Backset: If you’re dealing with an older door or lock, you might encounter the 5-inch backset measurement. It’s always important to double-check this measurement, as it’s not as common in modern applications.
Avoiding Common Lock Installation Problems
A frequent problem that arises is the lock not fitting correctly. This usually happens when the measurement from the edge of the door to the backset isn’t done properly. Locksmiths and hardware store personnel often receive inquiries from individuals facing this exact issue. Therefore, taking the time to measure precisely can save you several troubleshooting calls.
Conclusion
Understanding how to measure the backset of a lock is a fundamental skill that can make a significant difference in the success of your lock installation projects. Whether working with the popular 2 and 3/8 inches and 2 and 3/4 inches backsets or navigating the rarer 5-inch size, having the right measurement can ensure a seamless fit and optimal security for your doors.
The next time you’re tasked with fitting a lock, remember these steps and measure with confidence. Happy DIYing, and may all your locks fit perfectly!
Source: Terry Whin-Yates Mr. Locksmith Linkedin
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For further info go to Mr. Locksmith Training or email: Terry@mrlocksmith.com
