The Schlage 10-143 is the OEM ND Series tailpiece kit containing the core driver and JD medium tailpiece for Schlage ND Series cylindrical locks. The tailpiece is the mechanical interface between the cylinder and the lever chassis. When a key is inserted and turned, the cylinder plug rotates and that rotation transfers through the tailpiece to the lever mechanism inside the lock chassis, retracting the latch. Without the correct tailpiece in place and properly seated, the cylinder turns but nothing happens at the lever — the lock simply doesn't operate.

The 10-143 is the tailpiece kit for the JD cylinder format on ND Series locks. The JD designation identifies the cylinder format this tailpiece is designed to work with, and the medium length covers the standard door thickness application range on the ND Series platform. This kit ships as a field replacement or specification component when ND Series locks are ordered or retrofitted with compatible J-format cylinder configurations.

What the Schlage ND Series Cylinder Tailpiece Does

The ND Series uses a key-in-lever (KIL) cylinder design. In a KIL lock, the cylinder sits inside the lever and is retained by the lever housing. The cylinder plug has a tail on its back end — the tailpiece — that sticks out through the spindle and engages the locking cam inside the lock chassis. The rotation of the tailpiece is what physically moves the cam or driver that retracts the latch bolt or disengages the lever from the latch.

The tailpiece is also the component that determines whether a given cylinder format will work in the lock. Schlage's ND Series is available with multiple cylinder format options. The standard format uses the N523-022 yellow tailpiece for conventional Schlage cylinders and modular cylinders across all keyways. The JD format uses a different tailpiece that interfaces with the J-format cylinder configuration, which is why the 10-143 kit exists as a separate part: a conventional tailpiece won't seat correctly in a J-format cylinder and a J-format tailpiece won't engage the chassis correctly if the wrong driver is used.

Schlage ND Series Tailpiece and Cylinder Format Compatibility

The ND Series is Schlage's most widely installed commercial cylindrical lock family, ANSI/BHMA Grade 1 certified and available in 24 mechanical functions. It accepts Schlage conventional cylinders, Schlage FSIC (Full Size Interchangeable Core), Schlage SFIC (Small Format Interchangeable Core), and cylinders made to fit non-Schlage formats from Best, Corbin Russwin, Medeco, Sargent, and Yale. Each cylinder format requires the correct tailpiece or core driver to transmit rotation from the cylinder plug to the lock chassis.

The ND Series service manual specifies which tailpiece applies to each cylinder format. The 10-143 kit supplies the core driver and medium-length tailpiece for the JD cylinder specification. Facilities and locksmiths specifying ND locks with J-format cylinder compatibility need this kit to ensure correct operation. The ND Series is shipped with the driver/tailpiece included when ordered with the JD cylinder suffix, and the 10-143 is the field replacement or supplemental part when the tailpiece needs to be sourced separately.

Schlage Lock Tailpiece: Ordering the Right Part

Getting the correct tailpiece is not just about fit — it's about function. An incorrect tailpiece can result in the key operating but the lever not disengaging the latch, the key not returning to the resting position correctly, or the cylinder spinning without engaging the cam. Confirm the cylinder format installed or being specified in the ND Series lock before ordering. The reference for the complete tailpiece chart by cylinder format is the Schlage ND Series Service Manual available as a downloadable catalog on this product page.

For the complete Schlage ND Series cylinder and tailpiece catalog, SecurityParts stocks OEM parts across all cylinder formats. Free shipping on orders over $450.