what length cylinder for mortise locks

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Answer
Typically for a 1-3/4" door you would use a 1-1/4" cylinder.  Use the Table in the Pricebook for a reference:  
There are different mortise cylinder length options depending on the cylinder type. Below is a list of available options for conventional, FSIC, and SFIC cylinders, as well as the convent...
The Schlage L-Series uses a clover leaf cam with the exception of the L9060 outside cylinder which uses a straight cam. The cam part number will depend on the type of mortise cylinder, keyway (for ...
Schlage offers a comparable cam to the Yale 2160 and it will operate any Yale lock that utilizes the Yale 2160 cam.     Schlage Cams for Yale 2160  Part Number  Description  B520-7...
The Sargent cams listed below work for all applications except 16 inside and 50 outside.  The equivalent Sargent cam is the 13-0660. Use the B520-736 for modular cylinder lengths of 1 1/8",...
The 09-900 mortise cylinder thumbturn has three handing options: right hand, left hand, and non-handed.  Handing of the cylinder is done by a check ball and spring placed in the housing a...
Also applies to the 09-900 XL12-196 mortise cylinder coin turn.