The N523-022 is the tailpiece only, the flat bar that transfers the key turn from the cylinder into the lock chassis on a Schlage ND Series lever. It is not a cylinder and not a lever set. If a key turns freely in the cylinder but the latch doesn't retract, a sheared or wrong-length tailpiece is the usual culprit, and this is the piece that fixes it.

Keyway makes no difference here. The N523-022 is stated to work with ND Series levers and modular cylinders across all keyways, because the tailpiece engages the back of the cylinder mechanically and never touches the pinning or the key section. Order it for a C, C-K, Everest, or restricted-keyway modular cylinder alike.

No. The N523-022 is specific to ND Series levers and their modular cylinders. Mortise locks and deadbolts use different cylinder-to-chassis drive parts, so this tailpiece is the wrong part for an L Series mortise or a B Series deadbolt. Match the tailpiece to the lock family you are actually working on.

For ND Series levers with modular cylinders, yes, one part number covers the fleet. The N523-022 is called out for ND levers and modular cylinders in all keyways, so a single item on the shelf serves doors keyed to different sections and different lever designs, as long as they are all ND Series.

Tailpiece only. The N523-022 ships as the drive bar, so if you are also replacing the plug you need the ND Series modular cylinder in your keyway ordered alongside it. If your existing cylinder is fine and only the tailpiece is damaged or missing, this is all you need.

One configuration only. The N523-022 is sold as a single model with no finish, length, or handing options to specify, which is the ordering detail that trips people up on other cylinder parts. Handing does not apply to a tailpiece.