Master Lock Co 3KA-3221 Laminated Padlock Keyed Alike

Product Description

The MASTER LOCK CO 3KA-3221 is a 1.5-inch laminated padlock designed for keyed-alike applications where multiple locks must operate from a single key. The padlock ships keyed alike to key number 3221, making it a practical choice for facilities, job sites, and mechanical rooms that require consistent access control across several lock points. The shackle measures 0.75 inches in length and 0.281 inches in diameter, offering a compact, secure fit for standard hasps, chains, and gate hardware. Laminated construction layers steel plates together to build resistance to cutting and physical attack.

This padlock is suited for commercial and light industrial applications where uniform keying across multiple units is required. Typical install scenarios include equipment lockout/tagout programs, storage units, gang boxes, fence gates, and utility enclosures. Each unit is sold individually but packaged in a box of six, making it straightforward to equip multiple access points with matching hardware in a single order. Compatible key blanks for duplication are the Master Lock K1BOX or Ilco blank M1 TV 320-952.

Key Features

• Keyed alike to key 3221 — all units in a set operate from one key
• Laminated steel body construction for impact and cut resistance
• Shackle length of 0.75 inches suits standard hasps and chain links
• Shackle diameter of 0.281 inches fits common hasp slot sizes
• Compatible with Master Lock key blank K1BOX or Ilco blank M1 TV 320-952 for key duplication
• Packaged six units per box for multi-point keyed-alike installations

Compatibility

Keyed alike to Master Lock key 3221. Key duplication is supported using Master Lock key blank K1BOX or Ilco blank M1 TV 320-952. Designed as an OEM-style keyed-alike padlock for trade and facility applications requiring matched keying across multiple lock points.

Installation Notes

Installation requires no special tools — insert the shackle through the hasp or chain link and push down to lock. Before installing on lockout/tagout applications, confirm the program complies with applicable OSHA 29 CFR 1910.147 control of hazardous energy requirements. Do not force an incompatible key blank into the cylinder, as this can damage the pin tumblers. For lockout/tagout use, verify the padlock color and keying protocol meets your facility energy control program before placing in service.

Technical Specifications

• Body Width: 1.5 inches
• Shackle Length: 0.75 inches
• Shackle Diameter: 0.281 inches
• Keying: Keyed Alike to Key 3221
• Body Construction: Laminated Steel
• Weight: 1.98 pounds (per package of 6)
• Package Quantity: 6 units per box
• Unit of Measure: EA

Standard Information

• Brand: MASTER LOCK CO
• Manufacturer Part Number: 3KA-3221