Master Lock 3730USN Replacement Key

Master Lock 001USN–4500USN replacement keys are designed to replace lost or missing keys for Master Lock padlocks and security locks that use the 001USN through 4500USN key code series. These replacement keys provide a practical way to restore access without replacing the lock.

Commonly used on Master Lock laminated steel padlocks, utility locks, and commercial security applications, this key series is found in schools, construction sites, storage facilities, gyms, and workplaces. Each replacement key is manufactured to match original Master Lock specifications, ensuring proper fit and reliable operation.

To order the correct key, locate the key code stamped on your original key or printed on the original packaging. The code is not engraved on the lock body and is required to identify the correct replacement within the 001USN–4500USN series.

Ideal for facilities, contractors, maintenance teams, and individual users, ordering Master Lock replacement keys from EasyKeys.com ensures accurate key matching and expert support to help confirm the correct key code.