There are typically 3 kinds of security hinges on the market.
Security stud door hinges.
The tab on the right side down in the picture locks with the hole on the left side locking the hinges in place.
Security hinges nrp and sec tab security hinges with security tabs or nrp non removable pins are excellent at providing additional security to any door.
To install the security studs remove two screws from your hinge.
Doors that open outward have their hinge pins on the outside of the building.
If a potential intruder removes the hinge pins the security stud protects the door from being removed by locking the leaves of the hinges together.
Security tab or stud hinges security tabs are features on butt hinges that lock the two leaves of the hinge together when the door is closed.
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Even if the hinge pins are removed the door can t be lifted or pulled off the hinges.
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Security studs are used for exterior doors that open outward.
The stud is installed into one side of the hinge plate and it protrudes a quarter inch or so.
These hinges are great for out swing doors and sheds as they help prevent someone from removing the hinges to break in.
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