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...
Excessive premature frame rusting is caused by improper jobsite installation practices and most likely caused by the following circumstances:
Grout:
Frames are grouted in place using incorrec...
All lock cylinders on a specific project are operable by a special "project key". Duplicates of this key may be assigned by the building contractor to workmen and subcontractors as required. ...