Marks USA 21AC Entrance Double Cylinder Unilock Ornamental Iron Mortise Lock with Round Knob

Marks USA 21AC Entrance Double Cylinder Unilock Ornamental Iron Mortise Lock with Round Knob

The Marks USA 21AC is a commercial-grade Entrance Double Cylinder Unilock Ornamental Iron Mortise Lock designed for storm doors and ornamental iron door applications. Engineered for 1" door thickness with a Series 9 lock body and a 2-1/2" backset, this reversible mortise lock features a 1" bolt and 1/2" latch projection, making it a reliable solution for demanding entrance applications. The lock front measures 1" x 7-1/8", and the unit is constructed with thru-bolted solid brass trim assemblies and spring-loaded captivated spindles for enhanced security and durability. ANSI/BHMA and UL Listed, this lock meets rigorous commercial performance standards.

Key Features

• Door Thickness Compatibility: Designed specifically for 1" door thickness, ideal for ornamental iron and storm door applications.
• Precise Backset & Lock Body: Series 9 lock body with a 2-1/2" backset ensures accurate, consistent fitment across compatible door preparations.
• Reversible Mortise Lock: Features a 1" bolt and 1/2" latch projection with a reversible design for flexible handing during installation.
• Lock Front Dimensions: Lock front measures 1" x 7-1/8" for a precise, clean fit within the door mortise pocket.
• Thru-Bolted Solid Brass Trim: Solid brass trim assemblies secured with a thru-bolted design eliminate threaded swivel spindles for superior security and long-term reliability.
• Uni-Lock Single Screw Assembly: Innovative Uni-Lock design simplifies installation with a single screw assembly, reducing installation time and complexity.
• Spring-Loaded Captivated Spindles: Helper springs and captivated spindle design provide smooth, consistent operation and greater endurance over the life of the lock.
• Double Cylinder with Marks "A" Keyway: Cylinder features Marks "A" keyway, 5-pin tumbler with 2 keys included; keyed alike-6 configuration for convenient master-keying flexibility.
• Lifetime Mechanical Warranty: Backed by a Lifetime Mechanical Warranty for long-term confidence in commercial installations.

Certifications & Compliance

• ANSI/BHMA Certified
• UL Listed
• Commercial Grade
• Lifetime Mechanical Warranty

Technical Specifications

• Features: 1/2" Latch Projection; Spring Loaded Captivated Spindles
• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• Product Type: Mortise Locks
• Subcategory: Cylindrical Locks
• ANSI/BHMA: ANSI/BHMA, UL Listed
• Commercial/Residential: Commercial
• Product Attribute: Mortise Locks
• Electronic: No
• Door Thickness Range: 1"
• Product Category: Mechanical Locks
• Department: Door Hardware

Typical Applications

• Ornamental Iron Storm Door Entrances
• Commercial Office Building Entry Points
• Educational Facility Exterior Doors
• Retail Establishment Entrance Doors
• Multi-Tenant Residential Property Common Entrances
• Government and Municipal Building Access Points
• Industrial Facility Entrance and Security Doors

Why Marks USA 21 Series?

Marks USA has long been a primary manufacturer of Ornamental Iron Storm Door locks, continuously developing innovations such as the Uni-Lock single screw assembly, thru-bolted solid brass trim, and spring-loaded captivated spindles with steel hubs for greater endurance. The 21AC delivers professional-grade performance backed by ANSI/BHMA certification and UL listing, making it a trusted choice for commercial entrance applications where security and ease of installation are paramount.