Master Lock 21KALJ-10L102 Laminated Steel Padlock

Product Description

The MASTER LOCK 21KALJ-10L102 is a laminated steel padlock designed for high-security applications in commercial, industrial, and trade environments. The body measures 1-3/4 inches wide and is constructed from layered laminated steel, providing strong resistance to cutting and impact. The hardened steel shackle is 5/16 inches in diameter with a 3/4-inch width and 2-1/2-inch height, offering adequate clearance for most standard hasps and chains. Keyed alike, this lock is suited for facilities and job sites where multiple locks must be opened by a single key. Licensed contractors, facilities managers, and site supervisors commonly deploy this type of padlock for access control on equipment enclosures, gates, and storage units.

This padlock is appropriate for securing electrical panels, HVAC equipment enclosures, tool storage, job-site trailers, and other industrial or commercial applications where consistent key control across multiple locks is required. The keyed-alike configuration simplifies key management for teams operating in the field. The 5-pin cylinder contributes to a higher pick resistance rating, making this a suitable choice for environments where security is a priority.

Key Features

• Laminated steel body construction for impact and cut resistance
• Keyed alike configuration for single-key access across multiple locks
• 5-pin cylinder for improved pick resistance
• Hardened steel shackle — 5/16 inches diameter, 2-1/2 inches height, 3/4 inches width
• 1-3/4 inch wide body suitable for standard commercial hasps
• Maximum security padlock classification

Compatibility

Designed as an OEM-style replacement or direct-fit padlock for standard commercial and industrial hasps, chains, and lockout-tagout hardware requiring a 5/16-inch shackle diameter.

Installation Notes

Installation requires no tools — insert the shackle through the hasp or chain link and engage the locking mechanism. Before installing on electrical or HVAC enclosures, ensure all equipment is properly de-energized and locked out in accordance with OSHA lockout-tagout (LOTO) procedures. Confirm hasp slot dimensions are compatible with the 5/16-inch shackle before deployment. Do not force the shackle into undersized hardware.