Latch (hardware)
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A latch is a type of mechanical hardware, specifically a fastener, that is used to join two (or more) objects or surfaces together while allowing for the regular or eventual separation of the objects or surfaces.
Latches range in complexity from flexible one piece flat springs of metal or plastic, such as are used to keep blow molded plastic power tool cases closed, to multi-point cammed latches used to keep large doors closed.
There are many ways to obtain latches for various applications. A hardware store or distribution center is a convenient and cost effective way to find standard hardware. Custom solutions providers collaborate with designers and OEMs to create latches for specific applications.
Unless a feature is provided as part of the underlying to-be-held-closed object's design, a latch typically engages another piece of hardware on the other mounting surface. Depending upon the type & design of the latch, this engaged bit of hardware may be known as a keeper or a strike.
Common types of latches
a) Passage/Privacy b) Deadlatch (Entry) includes an extra tongue c) Deadbolt latch (Single throw bolt)
