Basic Hinge Types

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05 May 2019 21:31 #49 by SteveB
Basic Hinge Types was created by SteveB
There are four basic types of hinges. Always use the door as the reference...so a half mortise hinge would be mortised into the door and then surface applied to the frame. A half surface hinge would be surface applied to the door and then mortised into the frame.

Full Mortise: The standard hinge unless something else is called for. Mortised into the door and the frame.
Half Mortise: This is usually used on channel iron frames with a hollow metal or wood door.
Half Surface: This is sometimes used when you are installing a new door into an existing frame and the hinge locations are different.
Full Surface: This is usually used on tubular steel doors with channel iron frames.

Steve Behrens
https://www.commdoor.com/
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08 Jun 2019 11:17 #63 by IndianRM
Replied by IndianRM on topic Basic Hinge Types
As I mentioned earlier, I'm a welded in a HM Shop. They are starting to have me pull hardware for some ordered. Can you tell me what NRP means on a box of hinges?

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09 Jun 2019 12:18 #64 by Roadmaster
Replied by Roadmaster on topic Basic Hinge Types

IndianRM wrote: As I mentioned earlier, I'm a welded in a HM Shop. They are starting to have me pull hardware for some ordered. Can you tell me what NRP means on a box of hinges?


I can answer that one for you...NRP means Non-Removable Pin. They have a set screw that you can tighten against the pin, which will not allow the hinge pin to be removed from the hinge. They are used on outswing exterior doors. Outswing doors have the hinges exposed on the outside of the building. A thief can use a hammer and nail (for example) and hammer out the hinge pins; which will then allow him to remove the door from the opening (despite it being locked) and gain entry in to the building.
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