what does cylinder suffix HD mean

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Use the cylinder suffix 'T' for full size interchangeable core or the cylinder suffix 'HD' for small format interchangeable core, see Figure 1.  Small format also has a disposable core option ...
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 full size interchangeable cores or FSIC from Schlage.
The Schlage B and BD cylinder suffixes designate less small format interchangeable core (SFIC) cylinder prep for the lock. Any SFIC, 6-pin or 7-pin, can be inserted into the lock and will operate t...
The L9000 lock can be ordered for doors greater than 1 3/4" thick.  The allowable door thickness is dependent on the L lock function and how the lock is extended.  All locks for exte...
The B series accepts 6 or 7 pin small format cores when specifying with the "BD" cylinder suffix (less small format interchangeable core).  The tailpiece shown below is used for bo...