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2-Year Warranty

Worldwide Shipping, US Included

Ever turned a doorknob and wondered what happens inside the door? It’s not magic—it’s a clever piece of mechanical engineering called a door latch mechanism .

Understanding this mechanism is useful for troubleshooting a sticky door, installing new hardware, or just satisfying your curiosity. Let’s break down the parts using a simple diagram. Below is a simplified view of a standard spring-loaded tubular latch (the most common type in residential homes).

Size Chart

See how to measure yourself

Measure your chest (A) and hips (B) following our indications.  door latch mechanism diagram

The reference measurement will always be the larger of the two (A or B). Ever turned a doorknob and wondered what happens

Look in the chart to which size corresponds to that measurement. installing new hardware

Size chart
SizeReference measurements
 InchesCentimeters
2XS25.6 – 29.465 – 74
XS29.5 – 32.675 – 82
S32.7 – 36.183 – 91
M36.2 – 39.792 – 100
L39.8 – 42.8101 – 108
XL42.9 – 46.3109 – 117
2XL46.4 – 49.9118 – 126
3XL50 – 53127 – 134
4XL53.1 – 55.9135 – 142

Door: Latch Mechanism Diagram __hot__

Ever turned a doorknob and wondered what happens inside the door? It’s not magic—it’s a clever piece of mechanical engineering called a door latch mechanism .

Understanding this mechanism is useful for troubleshooting a sticky door, installing new hardware, or just satisfying your curiosity. Let’s break down the parts using a simple diagram. Below is a simplified view of a standard spring-loaded tubular latch (the most common type in residential homes).