Master Lock Company MLK3D 40mm Steel Padlock

Product Description

The MASTER LOCK COMPANY MLK3D is a 40mm wide laminated steel padlock built for high-security applications where cut resistance, pick resistance, and pry resistance are all required. The hardened steel shackle carries a nickel-plated finish to resist cutting attempts. A 4-pin cylinder cylinder provides pick resistance, while dual locking levers reinforce the shackle against prying. The laminated cadmium steel case resists rust and corrosion over the service life of the lock. Two brass keys are included. This padlock is suited for trade, industrial, and commercial environments where a reliable mechanical lock is part of a layered security plan.

This padlock is appropriate for securing gates, tool storage, equipment lockouts, job site enclosures, and utility access points. Its compact 40mm body fits standard hasp hardware commonly found in commercial and industrial settings. The corrosion-resistant case makes it a practical choice for both indoor and outdoor installations, including environments with moderate moisture exposure. Electricians and facilities maintenance technicians often use padlocks of this type for LOTO (lockout/tagout) procedures as part of site safety compliance programs.

Key Features

• 40mm wide laminated steel body with cadmium rustproof finish
• Hardened steel shackle with nickel plating for cut resistance
• 4-pin cylinder for pick resistance
• Dual locking levers provide pry resistance
• Includes two brass keys
• Compact form factor fits standard hasp hardware

Compatibility

Designed as a general-purpose replacement or new-install padlock for standard hasp and staple hardware used in commercial, industrial, and job site security applications.

Installation Notes

Installation requires no tools beyond fitting the shackle through a compatible hasp or staple. Verify hasp clearance matches the shackle diameter before installing. For lockout/tagout use, confirm compliance with OSHA 29 CFR 1910.147 and any site-specific energy control procedures. Do not force the shackle closed if the hasp is misaligned, as this can damage the locking levers.