Master Lock 1KA-3581 Keyed Alike Padlock 1.75 in Steel

Product Description

The MASTER LOCK 1KA-3581 is a keyed-alike padlock built for trade and industrial applications where multiple locks must operate on a single key. The body measures 1.75 inches and is constructed from steel with a silver finish. Dual bumpers protect the shackle and surrounding surfaces from impact and weather. The shackle diameter is 0.3125 inches with a shackle clearance of 0.9375 inches, giving adequate clearance for standard hasps and staples. Each padlock ships with 2 keys cut to key code 3581, so multiple units ordered to this specification will accept the same key.

This padlock is suited for use on equipment lockout-tagout (LOTO) programs, gate hasps, tool storage enclosures, and utility access points. Trade professionals in HVAC, electrical, and plumbing service work commonly use keyed-alike padlock sets to manage multi-point lockout procedures on mechanical equipment. The compact 1.75-inch body fits standard commercial hasps without requiring modification to existing hardware.

Key Features

• Keyed alike to key code 3581 — multiple units accept the same key
• 1.75-inch steel body with silver finish for durability
• Dual bumpers protect shackle and contact surfaces
• Shackle diameter: 0.3125 inches; shackle clearance: 0.9375 inches
• Includes 2 keys per lock
• Sold individually (each)

Compatibility

Designed for use with standard commercial and industrial hasps accepting a 1.75-inch padlock body. Compatible with other MASTER LOCK units keyed to key code 3581 for keyed-alike operation.

Installation Notes

Installation requires no tools beyond threading the shackle through the hasp or staple. When used in lockout-tagout applications, follow OSHA 29 CFR 1910.147 control-of-hazardous-energy procedures and ensure all authorized personnel hold their own keyed-alike unit before energy isolation begins. Inspect the shackle and body for wear or corrosion at each use interval.