Medeco 11R52 Maxum Double Cylinder Deadbolt, DL Keyway - UL 437 Pick-Proof High-Security

Medeco 11R52 Maxum Double Cylinder Deadbolt, DL Keyway — UL 437 Certified Pick-Proof High-Security Deadbolt

The Medeco Maxum 11R52 Double Cylinder Deadbolt is a premier high-security deadbolt engineered for residential and multi-unit applications demanding uncompromising protection. UL 437 listed and BHMA Grade 1 certified under ANSI/BHMA A156.36, this pick-proof deadbolt combines hardened steel inserts, rotating pins, and a heavy-gauge tubular steel housing to resist drilling, prying, bumping, and kicking. Designed to fit doors from 1-3/8" to 2-1/2" thick with a standard 2-1/8" crossbore and 1" edge bore (ANSI A115.13), the Maxum double cylinder configuration requires key operation from both sides — ideal for doors with adjacent glass windows or sidelights. Compatible with Medeco M4 and M3 key systems for seamless integration into comprehensive master key infrastructures.

Key Features

• Door Thickness Compatibility: Fits doors from 1-3/8" to 2-1/2" thick, accommodating a wide range of residential and light commercial door constructions.
• Standard Bore Dimensions: Requires a 2-1/8" crossbore and 1" edge bore per ANSI A115.13 for straightforward installation on pre-bored doors.
• UL 437 Listed Pick-Proof Construction: Hardened steel inserts and rotating pins provide certified resistance to picking, drilling, bumping, and covert bypass methods.
• Heavy-Gauge Tubular Steel Housing: Robust housing with a hardened 1" steel bolt and steel shroud delivers exceptional resistance to ice pick and crowbar attacks.
• Patented Key Control: Special angle-cut keys and restricted blanks are available only through Medeco-authorized service centers, ensuring only authorized individuals can duplicate keys.
• Double Cylinder Configuration: Requires key operation from both sides of the door, providing enhanced security for doors with glass windows or sidelights nearby.
• M4 and M3 Key System Compatibility: Medeco 4 (M4) cylinders offer patent-protected key control and resistance to 3D key duplication; Medeco M3 compatibility ensures master keying integration with existing high-security infrastructure.
• Master Keying Support: Supports large, flexible key systems including M4, M3, BiLevel, and CLIQ for expansive master key system configurations.
• Steel Strike Plate with 2" Screws: Anchors deep into structural framing for reinforced door frame security against kick-in attacks.
• Optional Captive Thumbturn Version: Available for convertible egress security applications.

Certifications & Compliance

• UL 437 Listed — Certified Pick and Drill Resistance
• ANSI/BHMA Grade 1 Certified (A156.36)
• ANSI A115.13 Bore Specification Compliance

Technical Specifications

• Series: Maxum® Residential Deadbolt
• Cylinder Technology: Medeco 4 (M4)
• Pinning: 5 or 6-Pin
• Keyway: DL Keyway
• Certification: UL 437 Listed; ANSI/BHMA A156.36 Grade 1 (M4)
• 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

• High-Security Residential Entry Doors
• Apartments and Multi-Unit Residential Buildings
• Properties Requiring Pick-Proof and Bump-Resistant Deadbolt Solutions
• Doors with Adjacent Glass Windows or Sidelights Requiring Double Cylinder Security
• Sites Needing Key Control Integration with Existing Medeco M3 or M4 Systems
• Light Commercial and Mixed-Use Properties
• Master Key System Installations Requiring Expanded Key Variation

Why Medeco?

Medeco Maxum deadbolt products deliver professional-grade security through a combination of hardened steel inserts, rotating pins, a heavy-gauge tubular steel housing, and a hardened 1" steel bolt with steel shroud — all certified to UL 437 and BHMA Grade 1 under ANSI/BHMA A156.36. The patented key control system, restricted to Medeco-authorized service centers, ensures that key duplication remains exclusively under the owner's control. Engineered for demanding residential and commercial applications where certified, covert-attack-resistant performance is non-negotiable.