Accentra (Yale) 3521 / 3521T Multi-Sized Door Closer with Holder/Stop Arm

The Accentra Yale 3521 and 3521T are multi-sized surface-applied parallel arm door closers from the Accentra 3000 Series architectural door closer platform, formerly marketed as the Yale 3521. Both models incorporate a holder/stop arm with a dead stop soffit plate. The 3521 provides a stop-only function. The 3521T adds hold-open capability via a thumbturn on the arm. Grade 1 heavy-duty, sizes 1 through 6 adjustable. American Locksets is an authorized Accentra ASSA ABLOY dealer stocking the 3521 and 3521T in multiple finishes with same-day shipping and free shipping on orders over $300.

Accentra 3521 Holder/Stop Arm: What the Arm Does and When It Gets Specified

The holder/stop arm on the 3521 and 3521T is a parallel arm with an integrated dead stop built into the soffit plate. The stop is field adjustable to a predetermined open position between 85 degrees and 110 degrees, in 5-degree increments. When the door reaches the set stop position, the closer's backcheck feature slows the door speed before contact, reducing the impact force on the stop. The door then dead stops at the set angle.

This arm is specified on openings where a wall or floor-mounted door stop cannot be installed. Wide corridors, open walls, stone or tile floors where a floor stop cannot be anchored, and doors that swing against projecting furniture or casework all represent common 3521 applications. The holder/stop arm serves the door stop function as part of the closer assembly itself, eliminating the need for a separate stop.

The stop on the soffit plate is removable on the 3521, which allows the closer to also be used in applications where a separate auxiliary door stop will be installed but the parallel arm parallel configuration is still required.

The 3521T adds a hold-open thumbturn at the arm. Activating the thumbturn mechanically holds the door in the open position. This is the correct selection when the opening requires hold-open capability for traffic flow, move-ins, or scheduled open periods, in addition to the dead stop function.

Accentra Yale 3521 Specifications

• SKU: 3521 (stop only), 3521T (stop with hold-open thumbturn)

• Series: Accentra 3000 Series Architectural Door Closers (formerly Yale 3000 Series)

• Grade: Grade 1 Heavy Duty

• Mounting: Surface applied, push side parallel arm

• Power Size: Multi-sized, field adjustable through sizes 1 through 6

• Arm Type: Parallel arm with holder/stop at soffit plate

• Stop Range: 85 degrees to 110 degrees, adjustable in 5-degree increments

• Hold Open: 3521: No hold-open. 3521T: Yes, thumbturn hold-open

• Backcheck: Hydraulic backcheck standard, slows door before reaching stop

• Mechanism: Rack and pinion design

• Valves: Staked valves for long-term stable hydraulic performance

• Fasteners: Self-drilling, self-tapping screws included

• Valve Adjustment: Separate sweep, latch, and backcheck valve controls for precise adjustment

• Cover: Standard cover. Additional cover options available in the 3000 Series family

• Finishes: 689 Aluminum standard. Additional architectural finishes available

• Applications: Interior and exterior doors in high-traffic commercial, institutional, and government facilities where a wall or floor stop cannot be used

3521 vs. 3511: Choosing the Correct 3000 Series Arm

The 3511 is the 3000 Series closer with a hold-open arm. The 3521 uses a parallel arm with integrated dead stop. The 3511 arm holds the door open hydraulically without a stop; it is for openings where hold-open is the primary requirement and a wall or floor stop handles door protection. The 3521 arm combines the stop function into the arm itself, making it the correct choice when no auxiliary door stop can be installed. The 3521T adds thumbturn hold-open to that same stop arm configuration.

Browse all Accentra 3000 Series door closers, all Accentra Door Closers, and the complete Standard Door Closers catalog at American Locksets.