Sizing Continuous Hinge for 3 4 Door
How to size hinges
4 minutes | 28 Sep 2022
From concealed door hinges to stainless steel lift off hinges, your choices are vast. And no matter what your application, be it a data cabinet or outdoor cable enclosure, your hinges have their work cut out for them. You need to think about:
- The door size, both height and width
- The suspended weight
- The construction of the door, including the material
- The intended use and/or traffic expected through the door
Sizing the hinge properly is crucial. For instance, undersized concealed hinges can cause premature failure of the door and create safety issues.
How to size your hinges: Hinge Sizing Calculator
As noted, the two hinge dimensions we're concerned with are the leaf or hinge height and the overall hinge width (measured with the hinge in the fully opened position).
The hinge height required is determined by the door thickness and the door width. The width of the door is important, because it affects the weight of the door. A wider door will need more load-bearing support for stability.
For example, if the door is 1-3/8 inches thick and the width is no more than 32 inches, the hinge height is 3-1/2 inches. However, if the door is between 32 inches and 36 inches, the leaf height of the hinges must be increased to 4 inches to handle the increased weight.
Here's a simple chart to help determine the leaf height dimension:
| | | |
| 1-3/8" | Up to 32" | 3-1/2" |
| 1-3/8" | 32"-36" | 4" |
| 1-3/4" | Up to 36" | 4-1/2" |
| 1-3/4" | 36"-48" | 5" |
| 1-3/4" | Over 48" | 6" |
| 2", 2-2/4", 2-1/2" | Up to 42" | 5" (commercial duty) |
| 2", 2-1/4", 2-1/2" | Over 43" | 6" (commercial duty) |
The next step is to determine the overall hinge width, keeping in mind that this is measured with the hinge fully open, also called the full leaf span.
The minimum width can be determined by a simple calculation using three dimensions:
- Door thickness
- Backset
- Clearance required
To determine backset, here is a general rule of thumb: For door thickness from 1-3/8 inches up to 2-1/4 inches, the standard backset is ¼ inch. For 2-1/2 inches door thicknesses, the standard backset is 3/8 inches.
Determine how much clearance you'll need to keep the door from contacting the casing or trim.
Then, use this formula to calculate the hinge width: (Door thickness – backset) x 2 + required clearance = overall hinge width
If your calculation result isn't a standard hinge size, go to the next size up.
You can use this next chart to help determine the hinge width as well. Just be sure to check it with your individual application for accuracy.
| | | | |
| 1-3/8" | 1/4" | 1-1/4" 1-3/4" | 3-1/2" |
| 1-3/4" | 1/4" | 1" 1-1/2" 2" 3" | 4" 4-1/2" 5" 6" |
| 2" | 1/4" | 1" 1-1/2" 2-1/2" | 4-1/2" 5" 6" |
| 2-1/4" | 1/4" | 1" 2" | 5" 6" |
| 2-1/2" | 3/8" | 3/4" 1-3/4" | 5" 6" |
What door hinges to use:
These calculations and charts should help you in choosing the correct size door hinge for your application. Here are a few more tips.
The height of the door is used to determine how many butt hinges you need. In general, you'll want to use one hinge for every 30 inches of door height. For example:
- Use two hinges for doors up to 60 inches tall
- Use three hinges if the door is between 60 and 90 inches tall
- For doors between 90 inches and 120 inches, use four hinges
If your door is between 37 inches and 120 inches wide, installing an extra hinge will supply added strength to support the additional weight and tension being applied to the frame.
Finally, the material used for the hinge can make a difference in its longevity and strength. For large doors, heavy duty hinges types support the weight and can be painted to match. If it works with your application, think about heavy duty steel hinges.
When corrosion and chemicals are problematic, consider using stainless steel hinges. What about aesthetics? Brass vs steel piano hinge, for instance? Brass hinges enhance the overall appearance. However, keep in mind that brass doesn't have the strength of steel or stainless steel. Never sacrifice safety for appearance.
Hinges Sizes
If you need help sizing your hinge, Essentra Components is happy to help. We offer a vast range of hinges, and we can help you decide which one is perfect for your application:
- Lift-off screw mount hinge
- Lift-off flag hinge
- Weld-on hinge
- Side hinge
- 90 Degree offset corner hinge
- Adjustable torque hinge
- Countersunk mount leaf
- Screw-on concealed hinge
- Leaf hinges – threaded stud mount hinge
- 3D adjustable HVAC hinge
- Continuous (piano) hinge
- Spring loaded removable concealed hinge
Source: https://www.essentracomponents.com/en-us/news/guides/how-to-size-hinges
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