Master Lock A1105MK-BLU Aluminum Safety Padlock Blue

Product Description

The MASTER LOCK A1105MK-BLU is an anodized aluminum safety padlock designed for lockout/tagout (LOTO) applications in industrial, commercial, and facility maintenance environments. The lock body is constructed from lightweight anodized aluminum and features a 5-pin tumbler rekeyable cylinder. It operates on a keyed-different, master-keyed configuration, meaning each lock has its own unique operating key while also accepting a designated master key (428M). The shackle measures 1.5 inches in height and 1 inch in diameter. The blue color coding supports visual identification of authorized personnel or departmental lock assignments, a common practice in LOTO programs.

This padlock is suited for energy isolation points on electrical panels, valves, circuit breakers, and equipment lockout stations in industrial plants, utilities, and commercial facilities. It is commonly installed by electricians, millwrights, and safety professionals administering LOTO programs compliant with OSHA 29 CFR 1910.147. The master-keyed feature makes it practical for safety supervisors who require override access across multiple individually keyed locks.

Key Features

• Anodized aluminum body — lightweight and corrosion resistant
• 5-pin tumbler rekeyable cylinder for flexible key management
• Keyed different with master key compatibility (master key 428M)
• Blue color coding for visual LOTO program identification
• Shackle dimensions: 1.5 inches x 1 inch

Compatibility

Compatible with master key 428M. Designed as an OEM-style safety padlock for use in standard LOTO program setups requiring keyed-different, master-keyed aluminum locks.

Installation Notes

Installation and removal of safety padlocks during lockout/tagout procedures must be performed by authorized, trained personnel in accordance with OSHA 29 CFR 1910.147 and facility-specific energy control programs. Always verify the energy isolation point is fully de-energized before applying or removing the lock. Do not use this padlock as a primary structural security device outside of its rated LOTO application. Rekeyable cylinder service should be performed by a qualified locksmith or safety equipment technician.

Technical Specifications

• Body Material: Anodized Aluminum
• Color: Blue
• Shackle Height: 1.5 inches
• Shackle Diameter: 1 inch
• Cylinder Type: 5-pin tumbler rekeyable
• Keying: Keyed Different, Master Keyed
• Master Key: 428M
• Weight: 0.75 pounds
• Sold As: Each

Standard Information

• Brand: MASTER LOCK
• Manufacturer Part Number: A1105MK-BLU