Master Lock Co 121Q Aluminum Padlock 3/4 in Black 4 Pack

Product Description

The MASTER LOCK CO 121Q is a solid aluminum padlock with a black vinyl cover, sold in a 4-pack configuration. The body measures 3/4 inches and is protected by a durable vinyl coating that resists corrosion and provides a secure grip. The shackle is constructed from 7/16-inch hardened steel with a 5/32-inch diameter, offering reliable resistance to cutting and prying. A 3-pin tumbler mechanism provides consistent key control for light- to medium-duty security applications. This padlock is suited for electricians, HVAC technicians, plumbers, and general trade professionals who need dependable lockout/tagout or general-purpose security hardware on the job.

The 121Q is commonly used in residential and light commercial settings for securing tool storage, gate hasps, cabinets, and equipment enclosures. Its compact 3/4-inch body makes it well suited for applications where space is limited. The black vinyl cover on both the padlock body and the keyhead protects against moisture and surface wear, making it practical for both indoor and outdoor use. The 4-pack quantity is appropriate for multi-point lockout procedures or stocking multiple service vehicles.

Key Features

• Solid aluminum body with black vinyl cover for corrosion resistance
• 7/16-inch hardened steel shackle resists cutting and tampering
• 5/32-inch shackle diameter for use with standard hasps and lockout hardware
• 3-pin tumbler mechanism provides basic key control
• Black vinyl-covered keyhead for consistent grip and identification
• Sold as a 4-pack for multi-point or fleet use

Compatibility

Designed for use with standard hasps, lockout/tagout stations, and equipment enclosures that accept a 7/16-inch shackle diameter padlock.

Installation Notes

Installation requires no tools. Ensure the hasp or anchor point is rated for the intended load before applying the padlock. For lockout/tagout applications, follow OSHA 29 CFR 1910.147 procedures and verify the shackle clears the hasp opening before use. Inspect the shackle and body for wear or damage at regular service intervals.

Technical Specifications

• Body Size: 3/4 inches
• Body Material: Solid aluminum with black vinyl cover
• Shackle Material: Hardened steel
• Shackle Clearance: 7/16 inches
• Shackle Diameter: 5/32 inches
• Locking Mechanism: 3-pin tumbler
• Package Quantity: 4
• Weight: 1.3 pounds

Standard Information

• Brand: MASTER LOCK CO
• Manufacturer Part Number: 121Q