The Falcon 030831-004-30 is the OEM Set Screw for Standard Lever, 1/4-20 x 1/4", for Falcon T Series cylindrical locks, documented in the official Falcon T Series Parts Manual. The set screw is confirmed in the Trim Assembly position across a broad range of T Series functions from passage through electrified storeroom.

What the Set Screw Does on a Standard Falcon T Series Lever

The set screw is a headless screw that threads into the lever hub and bears against the spindle shaft to lock the lever in the correct rotational position on the hub. On the Falcon T Series, the set screw in the Trim Assembly secures the lever so that rotating the lever handle transfers force through the spindle to the latch retractor mechanism. When the set screw is missing, stripped, or insufficiently tightened, the lever may rotate freely on the hub without engaging the latch retractor, causing the door to fail to open even when the lever is turned. The "Standard Lever" designation identifies this set screw as specific to Falcon T Series standard levers (Avalon, Dane, Quantum closed and open styles), as distinct from SFIC lever configurations.

The 030831-004-30 uses a 1/4-20 thread (1/4" diameter, 20 threads per inch, unified coarse thread) with a 1/4" overall length. This specification provides the correct engagement depth and clamping force against the spindle shaft within the lever hub assembly. Using a set screw with an incorrect thread pitch or length may result in insufficient engagement, cross-threading, or a lever that continues to slip after tightening.

Falcon T Series Functions That Use This Set Screw

The 030831-004-30 is confirmed in the Trim Assembly position for the following Falcon T Series models, as listed on the SecurityParts.com product page:

• T101: Passage latchset
• T12: Dummy trim
• T291: Privacy hospital lock
• T301: Privacy lock
• T351 and T351-IC: Closet 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. T381 (Classroom Security Lock) and T411 (Asylum Lock) are not listed for this set screw. No finish is required for this fastener. Contact SecurityParts.com for current availability.

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