Master Lock 1KA-3737 Laminated Steel Padlock Keyed Alike

Product Description

The MASTER LOCK 1KA-3737 is a laminated steel padlock designed for commercial and industrial security applications. The lock body measures 1.75 inches wide and is constructed from reinforced laminated steel layers for extra strength and durability. It ships keyed alike, meaning multiple units ordered together open with the same key, which simplifies access management on job sites and facilities. The hardened steel shackle provides strong cut resistance, and the dual ball bearing locking mechanism resists prying. This padlock is installed and managed by facility maintenance staff, security contractors, and trade professionals across a wide range of commercial environments.

This padlock is suited for industrial and commercial installations where consistent key control across multiple locks is required. The keyed-alike design allows ordering to match other locks using the W1 cylinder, reducing the number of keys needed on site. Typical applications include securing equipment enclosures, gates, tool storage, and utility access points in both residential and commercial settings.

Key Features

• 1.75-inch wide reinforced laminated steel body for extra strength and durability
• Hardened steel shackle measuring 0.9375 inches tall and 0.3125 inches in diameter for superior cut resistance
• Dual ball bearing locking mechanism provides maximum resistance to prying
• Keyed alike — multiple locks open with the same key, or order to match other locks with the W1 cylinder
• Non-rekeyable 4-pin W1 cylinder resists picking attempts
• Commercial-grade construction with superior resistance to drilling and prying

Compatibility

Designed as a keyed-alike padlock compatible with other locks using the W1 cylinder, allowing key consolidation across multiple units in the same keying system.

Installation Notes

Installation requires no tools — the padlock is a drop-in security solution for hasps, chains, and lockout points. Before servicing or replacing a padlock on an energized or pressurized system, follow applicable lockout/tagout procedures as required by OSHA standards. Confirm shackle clearance dimensions are compatible with the hasp or chain link before installation. Keep the shackle and locking mechanism free of debris and moisture to maintain long-term function.

Technical Specifications

• Body Width: 1.75 inches
• Shackle Height: 0.9375 inches
• Shackle Diameter: 0.3125 inches
• Body Material: Laminated Steel
• Shackle Material: Hardened Steel
• Locking Mechanism: Dual Ball Bearing
• Cylinder Type: 4-Pin W1
• Keying: Keyed Alike
• Weight: 0.56 pounds

Standard Information

• Brand: MASTER LOCK
• Manufacturer Part Number: 1KA-3737