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Antique brass mortise lockset with double cylinders and knob plate

Marks USA

Marks USA 21AC5RHR Antique Brass Right Hand Reverse Double Cylinder Mortise Door Lock

SKU CH-0ZFX-8QFZF MPN 21AC5RHR

Antique brass mortise lockset with double cylinders and self-adjusting spindles for steel gates

  • Lock keyingKeyed Different
  • Surface finishAntique Brass
  • Antique brass finish resists corrosion and matches period hardware
  • Right-hand reverse double cylinder operation requires a key on both sides for controlled entry
  • Through-bolted construction anchors the lock firmly to the door for added strength
  • Spring-loaded self-adjusting spindles with screwless knobs simplify fitting and maintain alignment
  • Two solid brass cylinders and two keys supplied ready for immediate installation

Product identity

The Marks USA 21AC5RHR is an antique brass mortise lockset designed for right-hand reverse doors. It combines a double cylinder deadbolt with ornamental Unilock knob and plate trim for entry applications.

Who it suits

This lockset fits steel gates and doors between 1-3/8" and 1-3/4" thick where keyed entry from both sides is required. It is not for buyers needing single-cylinder operation, electronic access, or hardware for thicker door panels.

Capacity and headroom

The 1" deadbolt throw and through-bolted construction handle forced-entry resistance on commercial-grade openings. Spring-loaded self-adjusting spindles maintain smooth operation through repeated cycles. The mortise cylinder format limits compatibility to doors prepped for that specific chassis style.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $243.99
Pricier than about 87% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks USA
Model name21AC5RHR
Size & build
Surface finishAntique Brass
More details
Lock keyingKeyed Different

Questions about this item

What door thickness range does this mortise lockset fit?

It fits doors between 1-3/8" and 1-3/4" thick, covering standard interior and exterior doors and steel gates.

Will the 1" deadbolt throw align with an existing strike plate on my frame?

The 1" deadbolt throw is standard for commercial mortise locksets and will align with most existing mortise strike plates.

How can I confirm the right-hand-reverse handing is correct after installation?

With the door closed, the latchbolt should face the hinge side and the key cylinders should operate the deadbolt smoothly from both sides.

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