Medeco 54515L Indoor/Outdoor 6-Pin High Security Padlock, 5/16" Shackle Diameter, Less Cylinder

Medeco 54515L Indoor/Outdoor 6-Pin High Security Padlock — 5/16" Shackle Diameter, Less Cylinder

The Medeco System Series 54515L is a high-security indoor/outdoor padlock engineered for demanding commercial applications where key control and physical attack resistance are paramount. Featuring a 5/16" diameter boron alloy steel shackle, this weather-resistant padlock delivers exceptional protection against cutting and pulling attacks while maintaining superior ductility to resist brittleness. The 6-pin cylinder configuration and hardened stainless steel inserts provide the ultimate defense against drilling and other forms of physical attack. This model is supplied less cylinder, allowing integration with Medeco 4 (M4) High Security cylinders or Intelligent Key electronic cylinder technologies.

Key Features

• 5/16" Boron Alloy Steel Shackle: Provides exceptional resistance to cutting and pulling attacks while maintaining an outstanding degree of ductility — not brittle under stress.
• Hardened Stainless Steel Cylinder Inserts: Internal stainless steel inserts deliver the ultimate defense against drilling, pulling, and other forms of vandal or physical attack.
• 6-Pin High Security Cylinder Configuration: The 6-pin design combined with Medeco's unique elevating and rotating tumbler pin system creates a virtually pick-proof locking mechanism.
• Weather-Resistant Indoor/Outdoor Design: Purpose-built body style engineered to withstand outdoor environmental exposure, suitable for a wide range of indoor and outdoor applications.
• Medeco 4 (M4) Key Control Technology: Patented M4 keys may only be duplicated by Medeco or an authorized Medeco service outlet, and only at the owner's request — preventing unauthorized key duplication including protection against 3D printing via the Shuttle Pin movable element.
• Flexible Keying Options: Padlocks can be ordered keyed alike, keyed differently, or master keyed to integrate with existing door hardware systems for comprehensive key management.
• Less Cylinder Configuration: Supplied without cylinder, enabling selection from a variety of Medeco cylinder technologies including Medeco 4 High Security and Intelligent Key electronic cylinders.
• Durable Machined Brass Cylinder Components: All Medeco cylinders are constructed of machined brass, designed to last the life of the equipment.
• Extended Shackle Availability: Extended shackle lengths are available for Indoor/Outdoor padlock models; shackle diameters available in 5/16" or 7/16".

Certifications & Compliance

• Commercial-Grade Security Hardware
• Patented Medeco 4 (M4) Key Control — Unauthorized Duplication Prevention
• Utility Patent Protection on M4 Design Against Unauthorized Key Duplication

Technical Specifications

• Series: Medeco System Series Padlock
• Cylinder Technology: Medeco 4 (M4)
• Pinning: 6-Pin
• Shackle Diameter: 5/16"
• Shackle Material: Boron alloy steel (cutting and pulling resistant)
• Body Style: Indoor/Outdoor Weather-Resistant
• Certification: UL 437 Listed
• Construction: Durable machined brass cylinder components; hardened stainless-steel cylinder inserts
• Warranty: 2-year manufacturer's warranty

Typical Applications

• Commercial Office Buildings and Campus Facilities
• Industrial and Warehouse Facilities
• Utility and Infrastructure Access Points
• Educational Institutions and Government Buildings
• Healthcare Facilities and Secure Storage Areas
• Outdoor Equipment and Asset Protection
• High-Security Environments Requiring Key Control Programs

Why Medeco?

Medeco System Series padlocks are engineered with boron alloy steel shackles, hardened stainless steel cylinder inserts, and patented M4 key control technology to deliver professional-grade security in the most demanding commercial environments. The virtually pick-proof elevating and rotating tumbler pin system, combined with machined brass cylinder construction, ensures long-term reliability and resistance to the full spectrum of physical and covert attacks. For facilities where key control and attack resistance are non-negotiable, the Medeco System Series sets the standard.