Master Lock 6121 ProSeries Padlock 2-1/8" Body, 1-1/8" Tall 5/16 Diameter Shackle, Weather Tough Cover, Keyed Different

The Master Lock 6121 ProSeries® padlock delivers high-security performance with a compact, heavy-duty build designed for demanding commercial use. The padlock features a 2-1/8" reinforced body with a 5/16" diameter shackle measuring 1-1/8" tall, providing strong resistance against cutting and prying.

Engineered for harsh environments, the lock includes a full Weather Tough® thermoplastic cover that protects internal components from moisture, dirt, ice, and corrosion—ideal for outdoor gates, equipment, and fleet applications.

This version is Keyed Different.

Features

• ProSeries® high-security laminated construction

• 2-1/8" body width

• 5/16" diameter shackle, 1-1/8" vertical clearance

• Weather Tough® protective cover

• Hardened shackle for increased cut resistance

• Designed for commercial, industrial, and outdoor use