Medeco 11R53 Maxum M3 Double Cylinder Deadbolt with Captive Key, DL Keyway - UL 437 Listed

Medeco 11R53 Maxum M3 Double Cylinder Deadbolt with Captive Key, DL Keyway — UL 437 & ANSI/BHMA Grade 1 Certified

The Medeco 11R53 Maxum M3 Double Cylinder Deadbolt is a premium high-security deadbolt engineered to exceed UL 437 standards and achieve ANSI/BHMA A156.36 Grade 1 certification, delivering unmatched protection for residential homes, apartments, condominiums, and light commercial entrances. Featuring patent-pending Medeco 4 (M3) technology with a movable element in the key, this deadbolt prevents unauthorized key duplication — including 3D printed copies — while a hardened 1" steel bolt and heavy-gauge tubular steel housing defend against crowbar, ice-pick, wrench, picking, drilling, bumping, and kicking attacks. Designed to fit doors 1-3/8" to 2-1/2" thick with a 2-1/8" crossbore and 1" edge bore (ANSI A115.13), the Maxum M3 integrates seamlessly into new and existing door preparations. The Captive Key configuration allows thumbturn operation when occupied and converts to a secure double-cylinder mode when not in use.

Key Features

• Door Thickness Compatibility: Fits doors 1-3/8" to 2-1/2" thick, accommodating a wide range of residential and light commercial door constructions.
• Standard Bore Preparation: Requires a 2-1/8" crossbore and 1" edge bore per ANSI A115.13 for straightforward installation in standard door preparations.
• Medeco 4 (M4) Key Control Technology: Patent-pending design with a movable element in the key prevents unauthorized duplication — including 3D printed copies — for superior key control.
• Hardened 1" Steel Bolt & Heavy-Gauge Tubular Steel Housing: Solid brass and steel construction resists crowbar, ice-pick, and wrench attacks for long-term security integrity.
• Captive Key Configuration: Allows thumbturn operation when the space is occupied and converts to a secure double-cylinder deadbolt when not in use, offering flexible access control.
• Advanced Master Keying Support: Compatible with M4, M4 BiLevel, and M4 CLIQ systems, supporting large-scale keying architectures for multi-unit or commercial applications.
• Angled Key Cuts: Increase the number of available key combinations for enhanced master keying capabilities and greater security flexibility.
• High-Security Strike Plate with 2" Screws: Anchors to structural framing to resist kick-in attacks, reinforcing the full door assembly.
• Steel Shroud & Reinforced Bolt Housing: Steel shroud protects the bolt from ice pick-style attacks; reinforced bolt housing withstands heavy prying attempts.

Certifications & Compliance

• ANSI/BHMA A156.36 Grade 1
• UL 437 Listed for Drill and Pick Resistance
• BHMA A156.30 Certified for Patented Key Control and Duplication Protection
• Heavy Duty Rating

Technical Specifications

• Series: Maxum® Residential Deadbolt
• Cylinder Technology: Medeco 4 (M3)
• Pinning: 5 or 6-Pin
• Keyway: DL Keyway
• Certification: UL 437 Listed; ANSI/BHMA A156.36 Grade 1 (M3)
• Bolt: 1" solid hardened-steel bolt in heavy-gauge steel housing
• Door Thickness: Fits doors 1-3/8" to 2-1/2" thick
• Door Prep: Standard 2-1/8" crossbore, 1" edge bore (ANSI/BHMA A115.13)
• Construction: Solid-brass cylinder construction with hardened steel inserts
• Warranty: 2-year manufacturer's warranty

Typical Applications

• Residential Homes and Single-Family Dwellings
• Condominiums and Apartment Buildings
• Home Offices and Private Studios
• Light-Duty Commercial Entrances
• Multi-Tenant Residential Properties
• Property Management and Rental Units Requiring Key Control
• High-Security Retrofit Applications on Standard Door Preparations

Why Medeco?

Medeco Maxum M3 deadbolts are built to the most demanding security standards, combining solid brass and steel construction with patent-pending M3 key control technology that blocks unauthorized duplication — including 3D printed copies. Certified to UL 437, ANSI/BHMA A156.36 Grade 1, and BHMA A156.30, the Maxum M3 is engineered for professionals and property owners who require proven, certifiable protection against the full spectrum of physical and covert attacks.