construction keyed cylinder

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With split key construction keying there are two ways the construction insert is retained in the cylinder so that it won't fall out the back end of the plug, see Figure 1.  The&nb...
This only applies to the full size interchangeable cores.  The SFIC mortise cylinders have part numbers for housings with construction cores (Disposable and Keyed).  Simply add (-ICX) to the end o...
The KR4023 mullion requires a 1-1/4" mortise cylinder with straight cam. This is stated in box 7 on the first page of the KR4023 mullion instructions.
Von Duprin KR (key removable) mullions requires a 1-1/8" or 1-1/4" mortise cylinder with the standard straight cam, the cam is not inverted. Please see chart below for part numbers. 
instructions
Von Duprin does not supply cylinders keyed alike.   Cylinders keyed alike are available from Schlage and Falcon.
A lock specified by a cylinder suffix BDC will be supplied with a disposable small format construction core, see Figure 1 below.  There is no metal key but instead the BDC cylinder has a ...
A small format disposable core is used as a SFIC construction core that is for low security applications and can be thrown in the waste bin after use.
The Schlage full size construction control key part number is 48-056-ICX.  The ICX suffix will change depending on if the key is for a new job or existing job.   New jobs: Specify "ICX"  E...
Primus cylinders can only be operated with a Primus key.