The Falcon 030917-005-30 is the OEM Tailpiece for the RU/T571 Inside cylinder position, 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 the inside position on Falcon RU and T Series cylindrical locks.

The Three-Part Falcon RU/T Series Tailpiece Family for Yale and Medeco Cylinders

The Falcon RU/T Series tailpiece for Yale and Medeco cylinders is available in three part numbers, each designed for a specific cylinder position within the lock. Selecting the correct part requires confirming which cylinder position is being replaced.

• 030917-001-30: Tailpiece for RU/T Series Standard Functions, covering the general outside cylinder position across keyed T Series functions.
• 030917-003-30: Tailpiece for the RU/T381 Inside position, specifically for the inside cylinder on the T381 Classroom Security Lock.
• 030917-005-30: Tailpiece for the RU/T571 Inside position, specifically for the inside cylinder on the T571 Dormitory Lock.

All three share the same price, the same Yale and Medeco cylinder compatibility, and the same T Series function list. The difference is the tailpiece geometry at the actuator engagement point, which is designed for the specific cam orientation and depth of each cylinder position. Installing the standard functions tailpiece at an inside cylinder position, or the inside tailpiece at a standard outside position, will result in incorrect engagement between the cylinder and the latch retractor.

T571 Dormitory Lock Inside Cylinder

The T571 Dormitory Lock uses an inside button and a separate inside cylinder position. The inside cylinder allows personnel with the correct key to lock or unlock the outside lever from inside the room. The 030917-005-30 tailpiece is the component that connects the Yale or Medeco cylinder at the inside position to the dormitory latch mechanism. Confirm the exact cylinder position before ordering to ensure the correct tailpiece is selected for the repair.

Yale and Medeco Cylinder Compatibility

Per the SecurityParts.com product page, the 030917-005-30 is designed for the following cylinder types at the inside position on 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

T Series Functions That Use This Inside Tailpiece

The 030917-005-30 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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