Master Lock Co 420 Safety Lockout Hasp Tempered Steel

Product Description

The MASTER LOCK CO 420 is a heavy-duty safety lockout hasp designed to secure energy isolation points during lockout/tagout (LOTO) procedures. Constructed from tempered steel, this hasp accepts shackle diameters up to 11/32 inches, making it compatible with a wide range of padlocks used in the field. At 4-3/8 inches long and 1 inch wide, it provides a solid, reliable barrier across valve handles, electrical disconnects, circuit breaker toggles, and other energy control points. Licensed electricians, maintenance technicians, and safety-qualified personnel use this hasp as part of OSHA-mandated LOTO programs across industrial, commercial, and utility environments.

This lockout hasp is suited for use in facilities where multiple workers must simultaneously lock out a single energy source. Multiple padlocks can be applied to the hasp, ensuring that no single worker can re-energize the equipment until every lock has been removed. It is commonly deployed on electrical panels, pneumatic valves, hydraulic systems, and piping isolation points in both commercial and industrial settings. The hasp ships in a package quantity of 12 units, making it practical for facility-wide LOTO kit builds or contractor inventory restocking.

Key Features

• Tempered steel construction for durability in demanding service environments
• Accepts shackle diameters up to 11/32 inches for broad padlock compatibility
• 4-3/8 inches long by 1 inch wide — sized for standard energy isolation points
• Multi-lock design allows several workers to lock out a single point simultaneously
• Packaged in quantities of 12, suitable for fleet or facility-level procurement

Compatibility

Designed as an OEM-style safety lockout hasp compatible with standard padlocks featuring shackle diameters up to 11/32 inches, suitable for typical LOTO applications across electrical, pneumatic, and mechanical isolation points.

Installation Notes

Lockout hasp installation is performed by qualified maintenance technicians or safety personnel in accordance with OSHA 29 CFR 1910.147 energy control procedures. Always verify that the equipment is fully de-energized and isolated before attaching the hasp. Do not apply the hasp to a live or pressurized energy source. Ensure all affected workers have applied their individual padlocks before any service work begins.

Technical Specifications

• Material: Tempered Steel
• Length: 4.375 inches
• Width: 1 inch
Maximum Shackle Diameter: 11/32 inches
• Weight: 3 pounds
• Package Quantity: 12 EA

Standard Information

• Brand: MASTER LOCK CO
• Manufacturer Part Number: 420