Master Lock 5KALF-X2251 Laminated Steel Padlock Keyed Alike

Product Description

The MASTER LOCK 5KALF-X2251 is a laminated steel padlock built for industrial and commercial security applications. The 2-inch wide reinforced laminated steel body delivers high resistance to physical attack, while the 1-1/2-inch tall, 3/8-inch diameter hardened boron alloy shackle provides strong cut resistance. A dual ball bearing locking mechanism resists prying, and the non-rekeyable 4-pin W1 cylinder is designed to resist picking. This padlock is part of a keyed-alike system, meaning multiple locks can be ordered to operate with the same key, simplifying key management across large facilities. Licensed security technicians, facilities maintenance professionals, and industrial tradespeople are the typical installers.

This padlock is suited for industrial facilities, commercial properties, construction sites, and utility enclosures where consistent, high-security locking is required. The keyed-alike feature makes it practical for operations that need multiple secured points accessible with a single key. It is sold as a single unit and can be matched to other locks sharing the W1 cylinder configuration, making it straightforward to expand an existing keyed-alike system without replacing hardware already in the field.

Key Features

• Keyed alike via 4-pin W1 cylinder — order multiple units to operate on one key
• 2-inch reinforced laminated steel body for high resistance to cutting and impact
• 1-1/2-inch tall, 3/8-inch diameter hardened boron alloy shackle for superior cut resistance
• Dual ball bearing locking mechanism for maximum pry resistance
• Non-rekeyable cylinder design helps deter picking attempts
• Compatible with other locks using the W1 cylinder for keyed-alike expansion

Compatibility

Designed to key alike with other Master Lock padlocks equipped with the W1 cylinder, allowing multiple locks to be ordered or matched to operate on a single key.

Installation Notes

Installation requires no special tools — the shackle inserts and locks manually into the lock body. Before securing to a hasp, latch, or chain, confirm the hardware is rated to match the security level of the padlock. Always verify the shackle clearance of the hasp or staple before purchase to ensure proper fit. This padlock is non-rekeyable; if keys are compromised, the lock must be replaced.

Technical Specifications

• Body Width: 2 inches
• Shackle Height: 1-1/2 inches
• Shackle Diameter: 3/8 inches
• Shackle Material: Hardened boron alloy steel
• Body Material: Reinforced laminated steel
• Locking Mechanism: Dual ball bearing
• Cylinder Type: 4-pin W1, non-rekeyable
• Keying: Keyed alike
• Weight: 0.84 pounds
• Unit of Measure: Each

Standard Information

• Brand: MASTER LOCK
• Manufacturer Part Number: 5KALF-X2251