The Falcon 030917-003-30 is the OEM Tailpiece for the RU/T381 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.

Inside Position Tailpiece vs Standard Functions Tailpiece

The Falcon RU/T Series tailpiece for Yale and Medeco cylinders is available in two part numbers for different cylinder positions. The 030917-001-30 is the Tailpiece for RU/T Series Standard Functions, covering the general cylinder position across keyed T Series functions. The 030917-003-30 is the Tailpiece for the RU/T381 Inside position, specifically designed for the inside cylinder on the T381 Classroom Security Lock and related RU Series installations. Both share the same price, the same Yale and Medeco cylinder compatibility, and the same T Series function list.

The T381 Classroom Security Lock has both an outside key cylinder and a separate inside cylinder position. The inside cylinder allows authorized personnel to lock or unlock the outside lever from inside the room without a key at the outside. The tailpiece geometry for the inside cylinder position differs from the outside position, requiring the 030917-003-30 rather than the 030917-001-30 when replacing the tailpiece at the inside cylinder. Confirm the cylinder position (inside vs outside/standard) before ordering to ensure the correct tailpiece is selected.

Yale and Medeco Cylinder Compatibility

Per the SecurityParts.com product page, the 030917-003-30 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 030917-003-30 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.

SecurityParts stocks OEM Falcon T Series cylindrical lock parts. Free shipping on orders over $300.