The Falcon 030917-001-30 is the OEM Tailpiece for Falcon RU/T Series Standard Functions, documented in the official Falcon T Series Parts Manual. Per the SecurityParts.com product page, this tailpiece is designed for Yale 1801, 5801, Yale 6-Pin LFIC, and Yale and Medeco 31 Series cylinders installed in Falcon RU and T Series cylindrical locks. It is confirmed in both the Falcon Cylinders and IC Cylinders positions across keyed and electrified T Series functions.

What the Tailpiece Does in a Falcon T Series Lock

The tailpiece is the metal fitting attached to the back of the key cylinder plug that transmits the rotation from a turned key to the latch retractor mechanism inside the Falcon T Series lock body. When the correct key is inserted and turned, the cylinder plug rotates and the tailpiece rotates with it, engaging the actuator or cam that retracts the latch bolt and allows the door to open. The tailpiece is the physical connection between the key cylinder and the lock mechanism. When a tailpiece is broken, deformed, or incompatible with the installed cylinder, the key may turn in the cylinder without retracting the latch. Replacing the 030917-001-30 with the correct tailpiece restores that mechanical link for standard function T Series and RU Series installations.

Yale and Medeco Cylinder Compatibility

The SecurityParts.com product page confirms the 030917-001-30 tailpiece is designed for the following cylinder types installed in Falcon RU/T Series locks:

• Yale 1801 cylinders
• Yale 5801 cylinders
• Yale 6-Pin LFIC (Large Format Interchangeable Core)
• Yale and Medeco 31 Series cylinders

This cross-brand compatibility makes the 030917-001-30 the correct tailpiece for facilities that have installed Yale or Medeco cylinders in Falcon RU or T Series cylindrical locks. The tailpiece geometry is machined to the specific actuation dimensions of these cylinder brands. Using a Falcon-specific tailpiece in a Yale or Medeco cylinder installation, or vice versa, will result in incorrect engagement between the cylinder and the latch retractor.

T Series Functions That Use This Tailpiece

The 030917-001-30 is confirmed in the Falcon Cylinders and IC Cylinders positions for the following Falcon T Series models, as listed on the SecurityParts.com product page:

• T351 and T351-IC: Closet lock
• T381 and T381-IC: Classroom security lock
• T411 and T411-IC: Asylum lock
• T501 and T501-IC: Entry lock
• T511 and T511-IC: Entry/office lock
• T521 and T521-IC: Office lock
• T561 and T561-IC: Classroom lock
• T571 and T571-IC: Dormitory lock
• T581 and T581-IC: Storeroom lock
• T851 and T851-IC: Storeroom lock (electrified, fail safe)
• T881 and T881-IC: Storeroom lock (electrified, fail secure)

IC variants denote Interchangeable Core versions of each function. No finish is required for this component. Contact SecurityParts.com for current availability on this item.

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