The magnet extensions can be used with both the SEM 7800 and the SEM1900 magnets.
To add extensions to the SEM series magnets, you "MUST" start with the 7810-514 coupler kit. The coupler kit provides (becomes) the first 1-1/2" of extension.
Additional extensions are available in 1/2", 3/4" 1", 2" and 4" lengths that can be combined in any combination to get the required total extension needed.
The SEM 7800 series magnet extensions have a 3/8-24 thread.
Maximum extension length for a single door application is 12" (if magnet mounted at top of door). Less if mounted at bottom of door, where it becomes a trip hazard.
Maximum extension length for an application with a pair of doors is 5". If longer, there is a possibility of the extension on one door preventing the other leaf from closing.
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