Ensure the safety and security of your mail with the CompX USPS-L-1172C National Mailbox Lock C9100, a high-quality locking mechanism designed to protect your correspondence and parcels from unauthorized access. Trusted by the United States Postal Service (USPS), this mailbox lock offers unparalleled reliability, durability, and peace of mind for homeowners, businesses, and property managers alike.USPS-Approved Design: The standout feature of the CompX USPS-L-1172C National Mailbox Lock C9100 is its USPS-approved design, which meets the stringent security standards set by the United States Postal Service. With its certification and endorsement by USPS, you can trust that this mailbox lock provides the highest level of protection for your mail, ensuring that it remains safe and secure until you retrieve it.Durable Construction: Crafted from high-quality materials, including durable steel components and precision-engineered mechanisms, this mailbox lock is built to withstand the rigors of daily use and harsh outdoor conditions. Whether facing extreme temperatures, heavy rain, or attempted tampering, it maintains its performance and functionality, providing reliable protection for your mail year-round.Keyed Alike Convenience: With its keyed alike design, the CompX National Mailbox Lock C9100 offers convenience and simplicity in key management. Whether installing multiple locks on a single property or managing a community mailbox system, keyed alike functionality allows you to use a single key to operate all locks, eliminating the need for multiple keys and streamlining access for residents or tenants.Easy Installation: Designed for easy installation on standard USPS-approved cluster box units (CBUs) or centralized mail delivery systems, this mailbox lock can be installed quickly and hassle-free by homeowners, property managers, or locksmiths. The straightforward installation process requires minimal tools and expertise, allowing you to upgrade your mailbox security with ease and confidence.Enhanced Security Features: Engineered with advanced security features, including anti-pick pins and tamper-resistant components, this mailbox lock provides an added layer of protection against unauthorized access and tampering attempts. The robust construction and precision engineering ensure that your mail remains secure and confidential, giving you peace of mind knowing that your correspondence is protected at all times.In conclusion, the CompX USPS-L-1172C National Mailbox Lock C9100 is a reliable and secure solution for protecting your mail and parcels from theft, tampering, and unauthorized access. With its USPS-approved design, durable construction, keyed alike convenience, easy installation, and enhanced security features, it offers everything you need to safeguard your correspondence and ensure that it reaches its intended recipient safely and securely. Whether used for residential mailboxes, commercial mail centers, or community mailbox systems, this mailbox lock delivers unmatched performance and peace of mind that you can rely on day after day.

Just replaced a 15-year-old mailbox lock with a new one. Easy install and worked just fine.

Very easy to install and the keys do not give us any issues. Great product.

I used this to replace my mailbox lock - - I live in a condo. This lock fit like a glove; installation took about two minutes! - - and the key operates much more easily and smoothly than the original lock ever did.

This was the exact replacement I needed- and it fit perfectly! However… be advised that it does NOT come with the locking arm needed. But, I just took the locking arm off my old lock and made it all work. Also, it does not come with any instructions, so I just went off the picture, thankfully it was quick and easy.Overall nice, I just wish it specified more.

This lockset is a bargain compared to the official USPS replacement and same model number and identical in size. Came with 3 keys and lock clip and screw nut for the hasp which you reuse from the old lock. Only difference whatsoever was the hasp nut which has different threading. Simple change out IF BOX DOOR IS OR CAN BE OPENED. If you can’t coax you box open then you’ll have to drill out the old, meet the mail carrier and hope they’ll let you reach through with a 1/2” nut driver, or call a locksmith. Hopefully it’s not a federal crime tampering with your own mailbox.

This was a quick and easy replacement for a broken mailbox lock. After contacting the post office, I found that my mailbox’s lock on our street’s cluster box was my responsibility. The PO did say they would replace it for $50. But, they were unable to provide a timeline. I’d need to go to the PO each day to get my mail for an unknown period. So, I decided to replace the lock myself.The only potential issue turned out to be a non-issue in my case. Before I knew about the need to specifically purchase either a clockwise or counter-clockwise lock, I ordered this lock, which is clockwise. The next day, when looking at an instructional video, I found out about the need to do so. Later, I noticed my neighbor, whose mailbox is directly under mine on the same pedestal, open his counter-clockwise. I then thought that what I ordered would not work. But, I inspected the mailbox to see if there appeared to be anything that would inhibit proper function in either direction. There didn’t appear to be, so I decided to try the clockwise lock when it arrived. It works perfectly. Our cluster box appears to work with locks that function in either rotation.

My mailman told me my lock needed to be replaced and that the post office would charge me $35. Well I decided to buy this lock for a fraction of the cost and guess what? It was the exact same lock that was on the mailbox in the first place. It was very easy to install.