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single action spring hinges
Single acting spring hinges are adjustable The half-surface versions JHS-2019with a mortise jamb leaf of 4-1/2`` and a surface door leaf of 5-1/2``,fitting standard dimension templates,while the JHS-20206 &JHS- 20207 are non-template styles mount flat to the door, and are mortised into the jamb. JYI-HSING`s spring hinges have been approved by the New York City Housing Authority (NYCHA) and patented in Taiwan,China and The U.S. The foolproof locking device for spring hinges we developed meets U.S. Federal specification FF-HH-116C (the top button on the hinge is not removable,so that the spring cannot be removed or tampered with)and makes our hinges ideal for use at home,in factories and especially in public buildings.In addition,we also improved the hinge`s annular sleeve and splitting small tube so that the door hinge is durable and provides a smooth operation with causing low noise or without causing any noise. (the tension adjustment stand is made of reinforced plastic material). The models of JYI-HSING`s single acting spring hinge are available for template and non-template. Finishes are prime coat. More detail, Pls access to www.jyihsing.com
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