Does Your Business Hinge on Profit? An Overview of Butt Hinges
Hinges. Do you sell them? Do you service them? Do you replace them? Many locksmiths service the leading edge of the door from top to bottom.
When the screw holes in the hinges are in a 'template' format the holes line up with each other when the hinge is closed. (Photo 13) When the screw holes are in a 'zigzag' format the holes are offset from each other when the hinge is closed. (Photo 14) With a zigzag hole pattern a corresponding hole must be drilled to accept the extended screw head. In either style, when the hinge is closed the extended screw head prevents the shearing of the two leaves to gain access.
ELECTRIFIED HINGE NOTE
In many commercial applications a fire rated door has been prepared for electrical locking hardware. Sometimes the locksmith does this; sometimes a 'labeled' factory prepares it. Many hinges used for passing power are not fire rated. If these power transfer hinges are rated "BP" (Burglary Protection) UL634 they are rated for connectors and switches as this rating does not contain any fire resistance requirements applicable to fire doors. You can find a listing of UL fire rated power transfer hinges in the UL Fire Resistance Directory.
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