Master Lock 6121 Green Keyed Alike Door Lock

Lockout Padlock for Outdoor Use

This green Master Lock 6121 padlock is built for traffic and parking-lot environments where multiple locks must share one key. Its laminated steel body and boron-alloy shackle resist cutting and prying while the weather-tough cover shields the mechanism from rain and grit. Facility managers and maintenance crews can standardise on a single key across dozens of points.

Laminated Steel Body with Boron-Alloy Shackle

The 16-layer laminated steel body distributes impact force and resists drilling, while the 5/16-inch boron-alloy shackle adds high tensile strength. An open shackle design provides 7/8-inch clearance for thick hasps or chains, and the non-removable keyed-alike cylinder prevents accidental key loss during daily lockout routines.

Keyed-Alike System Limits Key Management

Every lock in the set operates from the same key, so one person can secure or release many isolation points quickly. This convenience means a lost key compromises every padlock in the group, making the system unsuitable for areas that require individual accountability or unique key codes per lock.