Is there an acoustic rating for ND locks

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The keycam may have failed, example here, the latest design keycam can be easily identified as the colored changed to black. Replace either the keycam or chassis as needed...
 This could also happen if the tailpiece isn't installed in a KIL, FSIC, or SFIC cylinder.  The FSIC driver also could have come loose from the core in the spindle.
Only the chassis components are modified for thicker door applications, the lever and spindle assemblies remain intact.  The following parts may be modified depending on the function of the lock ...
The lever removal tool can be used to remove levers in both the ND and the L Series mortise locks.
On August 15, 2012 Schlage began shipping a new, more ergonomic, lever removal tool to coincide with Phase 1 of the ND-Series improvement project.  This tool can be used for Schlage ND-Series ...
The Schlage ND is shipped with a driver/tailpiece when ordered with a LD, BD, or JD suffix.
Only the Schlage ND-Series can be prepped to accept non-Schlage cores. All designs are supplied with the appropriate tailpiece Non-Schlage cores are NOT included Lever designs available vary d...
STC stands for Sound Transmission Class. An STC (Sound Transmission Class) is a single number rating system derived from measured values of sound transmission loss in accordance with ASTM E90 and...
The default backset is 2 3/4" and the latch faceplate dimensions are 1 1/8" x 2 1/4". The latch supplied is the 13-047 deadlatch and 13-048 springlatch.
SDI 114 is no longer published as an SDI performance standard. The new SDI standard for acoustical Performance is SDI 128-09 Steelcraft does offer products that have been tested in accordance wit...
The AL and ND locks are not available in any stainless steel finishes.  The only option is either the 626 satin chrome or 625 bright chrome.