The Falcon 600279 is the OEM 500 Series Cylinder Nut Tool for the Falcon 24 and 25 Series exit devices, documented in the official Falcon 19/24/25 and XX Series Service Manual as a package of 5 tools. The 600279 is the installation and removal tool specifically designed for the 600278 (500 Series Cylinder Locknut) used in the 24/25 Series 500 Series trim. The two parts are companions: the 600278 is the cylinder locknut that secures the mortise cylinder in the trim housing, and the 600279 is the tool that installs and removes it correctly.

The package contains 5 tools. This reflects standard field stocking practice for service teams covering multiple job sites. In stock, no lead time.

Why the Falcon Cylinder Nut Tool Matters

The 500 Series cylinder locknut (600278) is a precision threaded ring with a specific engagement profile. It is not a standard hex nut and cannot be properly driven by common pliers, channel locks, pipe wrenches, or generic spanner tools. Attempting to use improvised tools on this locknut creates three predictable problems.

First, finish damage. The 600278 locknut is finish-specified to match the installed trim. Pliers and pipe wrenches leave marks on the locknut face and the surrounding trim surface that cannot be buffed out. In commercial projects where finish consistency is specified across a building, a marred locknut requires full trim replacement.

Second, engagement surface rounding. The 600278 locknut has specific engagement points that the 600279 tool is profiled to match. Generic tools apply force to points the locknut is not designed to handle, rounding off the engagement surfaces over time. Once rounded, the locknut cannot be removed without drilling or destructive methods, requiring full trim replacement to access the cylinder.

Third, improper torque. Too little torque and the cylinder moves in the trim housing under normal use. Too much torque and the trim housing cracks. The 600279 tool provides consistent force application at the correct engagement points so the cylinder seats properly without overtightening.

Falcon 600279: 500 Series Trim Coverage Across 24 and 25 Series Devices

The 600279 cylinder nut tool covers all Falcon 500 Series trim styles used on the 24 and 25 Series exit devices. From the official Falcon 19/24/25 and XX Service Manual parts table, the 500 Series trim family includes:

510L = Lever trim (Vandal Resistant) standard and 510L-BE (with Balance Escutcheon). Also Night Latch (510L-NL) and Dummy Trim (510L-DT) variants. 511L = Standard lever trim. 512TP and 512TP-BE = Touch Pad trim, standard and balance escutcheon variants. Also 512TP-NL Night Latch and 512-DT Dummy Trim variants. 513K and 513K-BE = Knob trim, standard and balance escutcheon. Also 513K-NL and 513K-DT variants.

Every one of these trim styles uses the 600278 cylinder locknut to secure the mortise cylinder in the trim housing, and every one requires the 600279 tool for correct installation and removal.

Falcon Exit Device Catalog: 600279 in the 24/25 Series Parts Package Table

The Falcon 19/24/25 and XX Service Manual lists the 600279 in the refill parts and packages table alongside several directly related components:

600278 = 500 Series Cylinder Locknut (the fastener this tool installs and removes, package of 10).

600319 = 24/25 Pushbar Guide, package of 2.

060125 = FSA/FSE Pivot Pin, package of 10 (for electrified FSA/FSE trim applications).

2729F and 2729P = Sex Bolts with machine screws, #10-24 FPHMS and PPHMS (for mounting the device to the door).

The 600278 locknut and 600279 tool are the most frequently needed pair in this table because cylinder replacement is a routine service task across the 24/25 Series device life. Rekeying, function changes, key system upgrades, and security audits all require cylinder removal and reinstallation, which requires the 600279 tool every time.

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