The Falcon 008876-000 is the OEM Blocking Ring, 1/8 inch, documented in the Falcon Keys, Keying Systems and Cylinders Catalog as the AR cam cylinder collar for C260 Series, (C)988, (C)990, and (C)992 longer mortise lock cylinders. A wave washer is included with each 008876-000 collar, per the official Falcon cylinders catalog. Finish must be specified at time of order. The 008876-000 is used across all 23 Falcon MA Series function variants documented in the Falcon MA Series Parts Manual, appearing under both the Cylinder Collars and Cylinders and Strikes diagram sections for every keyed MA Series function. In stock.

What the Falcon 008876-000 Blocking Ring Does

A blocking ring in the Falcon mortise cylinder system is a precision cylinder collar that installs around the mortise cylinder body between the cylinder flange and the trim surface. It serves two purposes simultaneously. First, it fills the gap between the cylinder's fixed body length and the specific door thickness and trim combination of the installation, ensuring the cylinder face sits correctly flush with or slightly recessed behind the trim escutcheon face. Second, it provides a tight, finished interface at the cylinder-to-trim transition point that seals the cylinder housing from the door face, preventing any gap that could allow tool access to the cylinder retainer or locking mechanism.

The 1/8 inch dimension of the 008876-000 is the ring thickness, representing how much additional spacing it provides between the cylinder flange and the trim surface. This is the thinnest ring in the 008876 blocking ring family, used when only a small projection adjustment is needed to achieve the correct cylinder seating position. The wave washer included with the 008876-000 provides light spring tension that prevents the blocking ring from vibrating loose in the cylinder housing during normal door operation.

Falcon 008876-000: AR Cam Cylinder Collar for C260 and Longer Cylinders

The official Falcon Cylinders catalog documents the 008876-000 specifically as the AR cam collar for the C260 Series and the longer (C)988, (C)990, and (C)992 mortise cylinder series. The "AR" designation identifies the cam profile style this collar is designed to work with. AR cam mortise cylinders use an Adams Rite-compatible cam geometry, which is the standard profile for aluminum storefront door hardware and glass door mortise lock applications where the cam must engage an Adams Rite-style chassis.

The official Falcon collar selection table from the Cylinders catalog shows the full AR cam collar assignments by cylinder length. The 008876-002 (3/8") is the AR collar for 1-1/8 inch cylinders in the 985 Series. The 008876-003 (1/2") covers 1-1/4 inch cylinders in the 986 Series. The 008876-004 (5/8") covers 1-3/8 inch cylinders in the 987 Series family. The 008876-000 (1/8") covers the C260 Series and all longer format (C)988, (C)990, and (C)992 cylinders, which are specified in applications requiring cylinder projection beyond the 1-3/8 inch standard range.

Falcon MA Series Mortise Lock Parts: 008876-000 Function Coverage

The 008876-000 blocking ring is listed in the parts diagrams for all keyed Falcon MA Series functions. From the official Falcon MA Series catalog: "Falcon offers two different types of cylinder guards in various thicknesses to work with sectional or escutcheon trim, different door ranges and various cylinder lengths. The factory will furnish the correct cam(s) and cylinder guard for the function and door thickness specified." The 008876-000 is the correct AR cam collar when a C260 Series or longer cylinder is installed in any MA Series function.

MA Series functions covered include 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), MA921, MA931, and MA941 (Dead Lock variants). All 23 functions use the same 008876-000 collar when the longer C-series cylinder is specified.

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). Finish must match the installed trim hardware. Specify part number and finish when ordering.

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