what keyway are construction cores

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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 letters GD, HD, BD, or BDC should be put after the lock function. EXAMPLE: ND53BD GD = Schlage SFIC core HD = Construction core BD = Less core BDC = Plastic temporary construction core