Hinge is the Load-bearing accessory, most used model is butt hinge, you can see all detailed info about butt hinge in this article.
What is butt hinge?
Butt hinge is the most in common use model. 2 leaves connect with a spindle, Its advantages are simple installation, high load-bearing capacity and clear quality standards.
Chapter 1
How many types of butt hinges are there?
– Drilled template common butt hinge
One of the most commonly used butt hinges. Suitable for wood dooe and steel door.
Consist of leaf, plug, bearing and spindle.
Some hinge will install 2 bearings, called 2BB, some will install 4 bearings, called 4BB,
The popular size has (height X width)4X3”, 4X3.5”.
The advantage of this kind of this hinge is simple structure, high load bearing, easy to install, just Cut two small slots in the door and door frame.
Regarding the screw hole, there is no standard yet. We will make the detail drawings and confirm with customers. Usually there are 4 screw holes on each side of the hinge, there are two most common arrangements, “C” shape and “Z” shape. C shape is suitable for steel doors, because the 4 screw holes of the C shape are distributed on two straight lines, and the screws may crack the wood after being driven into the wooden door.
– Flag hinge
Some project can’t install the hinge at the construction site, so the door manufacturer will Put the hinge on the door in advance, another hinge is pre-installed on the door frame. Then the door can be put on door frame with no process required.
There are two types of flag hinges, one for wooden doors and one for steel doors.
– Flush hinge
A kind of wood door and aluminum profile door, there are 2 reasons, one is the 2 kinds of doors are lightweight door, lighter than steel fire doors, the other is the aluminum profile door cannot be slotted.
The biggest advantage of flush hinge is easy to install, no need for slotting.
When the hinge closed, the thickness only 3-4mm.
– Horizon project hinge
A kind of hinge without plug in both ends. Hinge leaf working close with spindle, Both ends of the spindle are thinner, and the other hinge leaf is divided into two parts and sleeved on the spindle and then welded. Without plug and lubricating oil, then eliminate the failures caused by them.
– Adjustable heavy duty hinge
Without plug, With adjustable frame box adjustable in three dimensions.
Suitable for heavy doors.
Chapter 2
How to choose good hinge?
- Material.
The most commonly used materials for manufacturing hinges are 201 stainless steel, 304 stainless steel, 316 stainless steel. Corrosion resistance and strength are incremental.
The corrosion resistance of SUS201 is weak, and the cost of SUS316 is too high, so the SUS304 is the choose balance proformance and cost.
The method to test the corrosion resistance of hinges is salt spray test. The longer the time, the better the corrosion resistance.
- Smooth open and closed, no noise.
- The appearance is intact, the hinges are flat, and the surface has no obvious scratches.
- Size according to EU Profile
- Opening and closing times, the highest grade 7 is 200000 times
- Fire-rated Certification according to EN1634
Chapter 3
Failure modes
- The plug at the bottom falls off then the spindle falls off. It’s danger.
- Lubricating oil seeps. The internal lubricating oil will appear black when mixed with iron filings, and it will form an unsightly stain after oozing out. This is caused by the lack of tight coordination of the various parts of the hinge. Bleeding can be reduced with solid grease.
How to solve this problem?
- Use solid grease instead lubricating oil
- Weld the plug and spindle together
Chapter 4
The standard for hinges
EN1935 Building hardware single-axis hinges requirements and test methods
ANSI/BHMA156.1 American national standard for butts and hinges
EN1935 use a eight-digit code indicates the requirements of each function
Chapter 5
Why there are many size of hinges?
In order to suitable doors with different size. We should choose the right size hinge according to the thickness, height and weight of doors.
Why the each hinge use 2 bearings?
The outside ring of bearing is Likely to be squashed after load-bearing, In order to reduce the failure rate, it is best to use as few bearings as possible. Use 2 bearings is balance the failure rate and smoothness of opening and closing.
