The Schlage 10-142 is the OEM Schlage ND Series tailpiece kit for the Yale 7-pin FSIC cylinder format, designated JD YA7 in the Schlage NDE Series Service Manual tailpiece table. The kit includes a spring cage, lever, and the Yale 7-pin FSIC core driver - the mechanical interface that connects a Yale 7-pin interchangeable core to the ND Series lock chassis. This is the tailpiece kit specified when an ND Series cylindrical lock installation uses Yale 7-pin FSIC cores as the key system.

This is different from the Yale 6-pin FSIC tailpiece (09-061, designated JD YA6). Confirm whether the installed Yale IC cores are 6-pin or 7-pin before ordering. The two are not interchangeable.

What the Core Driver Does in the ND Series FSIC Configuration

The ND Series lock is designed to accept multiple cylinder formats. When configured for FSIC (Full Size Interchangeable Core), the lever housing includes a J-format IC housing - a full-size housing that accepts FSIC cores from Schlage, Yale, Corbin Russwin, Sargent, and Medeco. The core driver (tailpiece) is the bridge between the IC core and the lock chassis.

When a Yale 7-pin FSIC core is inserted into the ND Series lever housing, the core's drive stud contacts the 10-142 core driver. When the correct key is turned, the Yale core rotates, the core driver rotates with it, and that rotation operates the ND Series chassis mechanism - locking or unlocking the outside lever depending on the installed function. When the Yale control key is used to remove the core, the core driver stays in place, holding its last-commanded position until a replacement core is reinserted.

If the core driver wears, cracks, or fails to engage the Yale core's drive stud correctly, the core turns in the housing without operating the lock. This is the field failure condition that the 10-142 kit addresses.

Yale 7-Pin FSIC vs Yale 6-Pin: Why the Different Core Driver

The Yale 7-pin FSIC format has a different drive stud geometry than the Yale 6-pin FSIC. The extra pin chamber changes both the core body dimensions and the drive interface at the back of the core. The 10-142 core driver is machined specifically for the Yale 7-pin drive stud. The 09-061 (Yale 6-pin, JD YA6) core driver uses a different profile that does not correctly mate with the 7-pin format.

The 7-pin core provides more keying combinations than the 6-pin - a meaningful advantage for large facilities building extensive master key hierarchies where more key changes and fewer key conflicts are required.

Schlage ND Series Tailpiece Kit Family

The Schlage NDE Series Service Manual documents 12 competitor core driver configurations for the ND and NDE Series. The complete family covers:

Yale 6-pin FSIC (09-061, JD YA6), Yale 7-pin FSIC (10-142, JD YA7), Corbin Russwin 6-pin FSIC (09-062, JD CO6), Corbin Russwin 7-pin FSIC (10-141, JD CO7), Sargent core driver JD format (09-063, JD SAR), Sargent core driver LD format (09-060, LD SAR), Corbin Russwin core driver LD format (10-140, LD CO6), Medeco (10-143, JD MED), Schlage FSIC (N523-127, SCH FSIC), Schlage SFIC (N523-091, SCH SFIC), Universal SFIC driver with spacer (09-774), and universal SFIC spacer (D500-000).

Every FSIC or SFIC format has its own specific core driver part number because each manufacturer's IC core uses a different drive stud interface. Ordering the correct kit requires knowing both the IC brand (Yale) and the pin count (7-pin, not 6-pin).

For the complete Schlage ND Series tailpiece kit catalog, SecurityParts stocks OEM core drivers across all supported IC formats.