Master Lock M50XD Magnum Discus Padlock — Stainless Steel, Boron-Carbide Shackle

Secure, durable protection for storage spaces and equipment

The Master Lock Magnum M50XD Discus Padlock combines a robust 3-1/8 in (79 mm) wide stainless steel body with thoughtful design to withstand daily wear and outdoor conditions. The lock’s substantial profile communicates reliability, while its corrosion-resistant finish helps it hold up under rain, humidity, and dust. This padlock is designed to be versatile enough for a range of applications, from storage units to fleet equipment, without sacrificing ease of use.

A fully shrouded shackle minimizes exposed metal, reducing vulnerability to bolt cutters and casual tampering. The octagonal boron-carbide shackle, 7/16 in (11 mm) in diameter, offers enhanced hardness—approximately 50% tougher than standard hardened steel—so the lock can stand up to cutting and sawing attempts more effectively. This combination of a strong body and a fortified shackle contributes to a sense of security in everyday environments.

Inside, a four-pin cylinder adds complexity for better resistance to picking, while dual locking ball bearings help deter prying and hammering. The covered keyway keeps moisture and debris out, supporting reliable operation in varying weather. A reinforced body bumper provides scratch resistance during handling, installation, and transport. All of these features are backed by Master Lock’s lifetime guarantee, offering long-term assurance from a trusted brand.

Designed for practical, real-world scenarios, the M50XD suits storage units, garages, sheds, trailers, moving trucks, and other daily security needs. When selecting the right fit, it’s helpful to measure your door’s backset, cross bore, and thickness to ensure compatibility with installation requirements. This approach helps you make a confident choice without sacrificing convenience.

Key benefits at a glance

• Fully shrouded shackle minimizes exposure and defense against bolt-cutting attempts
• Boron-carbide shackle is notably harder than typical hardened steel
• 3-1/8 in wide stainless steel body delivers durability and corrosion resistance
• Four-pin cylinder enhances pick resistance for everyday security
• Dual locking ball bearings reinforce resistance to prying and hammering
• Weather-protected keyway and reinforced bumper support reliable performance outdoors
• Includes one padlock with two keys, backed by a lifetime guarantee

Practical uses

• Storage units, garages, sheds, trailers, and moving trucks
• Indoor and outdoor applications requiring robust security
• Situations where weather exposure and rough handling are common