The Falcon 008876-003 is the OEM Blocking Ring, 1/2 inch, documented in the Falcon Keys, Keying Systems and Cylinders Catalog as the AR cam cylinder collar for the 986 Series and 251 Series 1-1/4 inch mortise cylinders used in Falcon MA Series mortise locks. A wave washer is included with each 008876-003 collar per the official Falcon cylinders catalog. Finish must be specified at time of order. The 008876-003 appears in both the Cylinder Collars and Cylinders and Strikes diagram sections for all 23 keyed MA Series functions. In stock.

When the 986 Cylinder Requires the 008876-003 Blocking Ring

The Falcon 986 Series mortise cylinder is 1-1/4 inches long, one size longer than the factory-standard 985 Series at 1-1/8 inches. The 986 is specified when a door's construction requires a cylinder that projects further through the door assembly than the 985 can reach. This occurs most frequently in three situations: doors with thicker-than-standard construction such as 2 inch hollow metal, doors with added face materials such as laminate panels or armor plating that increase the overall door thickness, and applications where the trim escutcheon depth pushes the cylinder mounting position further back into the door.

When a 986 cylinder is installed with an AR cam, the 008876-003 (1/2 inch) is the correct collar per the official Falcon cylinder collar selection table. The 1/2 inch thickness compensates for the additional projection of the 986 body relative to the trim mounting position, ensuring the cylinder face aligns correctly with the trim escutcheon surface. Using a 3/8 inch collar (008876-002, correct for the 985) with a 986 cylinder would leave the cylinder face sitting too far proud of the trim, creating a visible gap and preventing the escutcheon from seating properly against the door face.

Falcon 008876-003: Position in the AR Cam Blocking Ring Family

The 008876 blocking ring family provides AR cam cylinder collars across six thickness increments, each matched to a specific Falcon mortise cylinder series. The complete collar-to-cylinder assignment from the official Falcon Cylinders catalog is:

008876-000 (1/8 inch): For C260 Series and longer (C)988, (C)990, and (C)992 mortise cylinders with AR cam.

008876-002 (3/8 inch): For 985 Series and related 1-1/8 inch cylinders (250, 965, 966, 973, 974) with AR cam. This is the most common collar in standard MA Series installations using the factory-default cylinder.

008876-003 (1/2 inch, this product): For 986 Series and 251 Series 1-1/4 inch cylinders with AR cam. Correct for thicker-door MA Series installations where the standard 985 cylinder is insufficient.

008876-004 (5/8 inch): For 987, C987, and C997 Series 1-3/8 inch cylinders with AR cam. Used in the thickest standard door applications in the MA Series cylinder range.

The 1/2 inch collar of the 008876-003 positions it in the middle of the family, bridging the gap between the most common standard-door configuration (008876-002 for 985) and the thickest-door standard configuration (008876-004 for 987). Selecting the wrong collar thickness for the installed cylinder length will result in misalignment between the cylinder face and the trim, improper cam engagement with the lock chassis, and potential failure of the latch or deadbolt to operate correctly.

Falcon Mortise Lock Parts: MA Series Function and Finish Coverage

The 008876-003 is confirmed in the parts diagrams for all 23 Falcon MA Series keyed functions: MA161 (Connecting Room), MA311 (Privacy), MA371 (Store Door), MA381 (Apartment Exit), MA411 (Asylum), MA431 and MA441 (Classroom Security), MA451 (Hotel Guest), MA521 and MA541 (Entry/Office), MA531 and MA621 (Apartment Corridor), MA551 (Holdback), MA561 (Classroom), MA571 and MA641 (Dormitory), MA581 (Storeroom), MA851 (Electrified Fail Safe), MA881 (Electrified Fail Secure), MA911 (Classroom Dead Lock), and MA921, MA931, and MA941 (Dead Lock variants).

Seven finishes are available: 605 (Bright Brass), 606 (Satin Brass), 613 (Oil Rubbed Bronze), 619 (Satin Nickel), 622 (Powder-Coated Matte Black), 625 (Bright Chrome), and 626 (Satin Chrome). The blocking ring finish must match the installed cylinder trim and escutcheon finish. Specify part number and finish when ordering.

SecurityParts stocks OEM Falcon MA Series mortise lock cylinder collars and blocking rings. Free shipping on orders over $300.