Master Lock 6121KALJ-12G101 Laminated Steel Padlock

Product Description

The MASTER LOCK 6121KALJ-12G101 is a heavy-duty laminated steel padlock designed for job site security, equipment lockout, and access control applications. The body measures 2-1/8 inches wide and is constructed from layered laminated steel with a black finish. The shackle is boron alloy, measuring 5/16 inches in diameter, 7/8 inches in width, and 2-1/2 inches in height. With a 5-pin tumbler cylinder and a keyed alike configuration, this lock is well suited for operations requiring multiple locks opened by a single key. It weighs 1.16 pounds.

This padlock is used across commercial, industrial, and trade service environments. Common applications include lockout/tagout (LOTO) procedures, gate and equipment yard security, storage containers, and utility access panels. The keyed alike feature is particularly useful for HVAC, electrical, and plumbing contractors managing multiple locks across a single job site or facility, reducing the need to carry separate keys for each point of access.

Key Features

• Laminated steel body construction for high impact and cut resistance
• Boron alloy shackle resists cutting and sawing attempts
• 5-pin tumbler cylinder for enhanced pick resistance
• Keyed alike configuration allows one key to operate multiple locks
• 2-1/2 inches shackle height accommodates a range of hasp and chain sizes
• Black finish for corrosion resistance and low-visibility job site use

Compatibility

Designed as an OEM-style replacement or direct-use padlock suitable for standard hasp, chain, and lockout/tagout hardware with shackle clearance requirements up to 2-1/2 inches.

Installation Notes

Installation requires no tools. Before securing equipment or panels, verify that all power sources, gas lines, or pressurized systems have been fully de-energized or isolated per applicable LOTO procedures and OSHA 29 CFR 1910.147 guidelines. Do not force the shackle into an oversized hasp slot, as misalignment can damage the locking mechanism. Inspect the shackle and body for wear or corrosion periodically, especially in outdoor or corrosive environments.