Medeco Indoor/Outdoor 6 Pin Padlock, 5/16" Shackle Diameter with Cylinder

Medeco® System Series High Security Padlock – M3/M4 Technology, Indoor/Outdoor, 5/16" Shackle

The Medeco Padlock System Series offers a high-security solution for both indoor and outdoor environments, built to withstand the harshest physical attacks while delivering unmatched key control. Designed with M3 and M4 cylinder technologies, this padlock line is ideal for protecting assets where cut resistance, drill protection, and unauthorized key duplication prevention are critical.

Widely regarded as one of the strongest combination padlock alternatives, the System Series padlocks use boron alloy steel shackles for superior tensile strength and ductility—resisting cutting, pulling, and twisting attacks with industrial-grade performance.

Key Features

• Medeco M4 high-security cylinder with utility patent and 3D key duplication protection

• 6-pin configuration with rotating tumbler pin system—virtually pick-proof

• Boron alloy steel shackle: resists cutting and enhances tensile strength

• Hardened stainless steel inserts inside the cylinder defend against drilling and physical tampering

• Shrouded shackle option available for increased protection

• Key control: Patented keys can only be duplicated by authorized Medeco® service outlets, at your request

• Available with Medeco Intelligent Key (electronic cylinders) and other technologies

Customization Options

• Keyed alike, keyed different, or master keyed

• Choose from key-retaining or non-key retaining

• Available in 5/16" or 7/16" shackle diameters

• Extended shackles offered for indoor/outdoor models

Applications

Perfect for securing:

• Outdoor gates and perimeter fencing

• Utility enclosures and industrial equipment

• Cargo containers, trailer doors, and storage units

• Retail back-of-house areas

• High-security lockers and commercial buildings

Why It Stands Out

The Medeco padlock System Series is engineered with the same cylinder strength found in high-security deadbolts, delivering maximum protection against sophisticated threats. This makes it a top choice for anyone searching for the strongest combination padlock substitute with customizable keying options.

Technical Specifications

• Material: Machined brass body with stainless steel inserts

• Cylinder: M4/M3 mechanical or intelligent key options

• Shackle: Boron alloy, 5/16” or 7/16” diameter

• Finish: Weather-resistant for both indoor and outdoor use