--- product_id: 42929162 title: "USPS-L-1172C National Mailbox Lock C9100 (Lock with 3-Keys) | GOLD Color 3 Keys" brand: "compx national" price: "214 Lei" currency: RON in_stock: true reviews_count: 9 category: "Compx National" url: https://www.desertcart.ro/products/42929162-usps-l-1172c-national-mailbox-lock-c9100-lock-with-3 store_origin: RO region: Romania --- # USPS-approved security 3 precision brass keys included Easy, tool-minimal installation USPS-L-1172C National Mailbox Lock C9100 (Lock with 3-Keys) | GOLD Color 3 Keys **Brand:** compx national **Price:** 214 Lei **Availability:** ✅ In Stock ## Summary > 🔒 Secure your mail like a pro—because your privacy deserves the best! ## Quick Answers - **What is this?** USPS-L-1172C National Mailbox Lock C9100 (Lock with 3-Keys) | GOLD Color 3 Keys by compx national - **How much does it cost?** 214 Lei with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/42929162-usps-l-1172c-national-mailbox-lock-c9100-lock-with-3) ## Best For - compx national enthusiasts ## Why This Product - Trusted compx national brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Streamlined Installation:** Quick setup with just a spring clip and mounting nut—no hassle, no fuss - • **Robust Metal Construction:** Built to withstand harsh weather and tampering attempts - • **Triple Brass Keys Included:** Enjoy convenient access with three durable, precision-cut keys - • **Trusted USPS-Approved Lock:** Meets strict USPS security standards for ultimate mail protection - • **Enhanced Anti-Tamper Design:** Advanced pins and tamper-resistant components keep your mail safe 24/7 ## Overview The USPS-L-1172C National Mailbox Lock C9100 by COMPX NATIONAL is a USPS-approved, high-security mailbox lock featuring durable metal construction, three brass keys, and an easy installation process. Designed for residential and commercial use, it offers advanced anti-tamper protection and keyed alike convenience, ensuring reliable, long-lasting mail security trusted by homeowners and property managers alike. ## Description ...... Review: Perfect fit and high quality - Perfect fit replacement for my cluster mailbox. I had purchased a cheaper item that had a lip on it. This item is an exact match and fit flush to the mailbox plate. The brass keys and tumbler were a little hard to work at first but a shot of lubricant in the cylinder was a quick fix. Very happy to have 3 keys again. Super easy installation... One retaining clip, plus one nut to secure the lock bracket Review: Secure Mail Protection - 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. ## Features - Includes spring clip, mounting nut and (3) keys - Does not include cam/latch - C9100 operates clockwise ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01CEUXCQC | | Additional Features | Key Lock | | Best Sellers Rank | #11,167 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Wall-Mount Mailboxes | | Brand | COMPX NATIONAL | | Brand Name | COMPX NATIONAL | | Color | Silver | | Control Method | Touch | | Controller Type | Hand Control | | Customer Reviews | 4.6 out of 5 stars 1,397 Reviews | | Included Components | Lock | | Item Dimensions | 2 x 1 x 1 inches | | Item Highlight | GOLD Color 3 Keys | | Item Weight | 4 ounces | | Item dimensions L x W x H | 2 x 1 x 1 inches | | Lock Type | Key Lock | | Manufacturer | COMPX NATIONAL | | Manufacturer Part Number | USPS-L-1172C | | Material | Metal | | Material Type | Metal | | Model Name | C9100 | | Model Number | C9100 | | Number of Items | 1 | | Number of Packs | 1 | | Number of Pieces | 1 | | Recommended Uses For Product | Mailbox Security, Wall-Mounted Lock | | Shape | Round | | Special Feature | Key Lock | | Style Name | Modern | | UPC | 049793391063 | | Unit Count | 1 Count | ## Product Details - **Brand:** COMPX NATIONAL - **Item dimensions L x W x H:** 2 x 1 x 1 inches - **Lock Type:** Key Lock - **Material:** Metal - **Special Feature:** Key Lock ## Images ![USPS-L-1172C National Mailbox Lock C9100 (Lock with 3-Keys) | GOLD Color 3 Keys - Image 1](https://m.media-amazon.com/images/I/51a8entFxcL.jpg) ## Questions & Answers **Q: If all I have is an empty hole in my mail slot door, will this kit give me everything I need to install the lock?** A: This lock does not include the tailpiece that mounts on the back of the lock and is what turns to lock the mailbox door. That is sold separately and the part number is: CompX C7120. Thank you, NLS Products. **Q: l need to buy the latch and the lock together? The previous owner took everything with him.** A: No, this lock does not include the latch. You get exactly what is pictured. It's odd that the seller would represent otherwise. **Q: can the mailman open the lock** A: I am a mailman. We have a key that open cluster boxes, but we do not have a master key that will open this lock. **Q: Mail boxs locks for door** A: Hi in some towns the post office doesn’t change mail box keys anymore so I had go buy my locks & Install them , so be careful , look at what you need & Match them on amazon locks & pick the best one ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect fit and high quality *by Z***G on June 7, 2026* Perfect fit replacement for my cluster mailbox. I had purchased a cheaper item that had a lip on it. This item is an exact match and fit flush to the mailbox plate. The brass keys and tumbler were a little hard to work at first but a shot of lubricant in the cylinder was a quick fix. Very happy to have 3 keys again. Super easy installation... One retaining clip, plus one nut to secure the lock bracket ### ⭐⭐⭐⭐⭐ Secure Mail Protection *by K***J on May 13, 2024* 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. ### ⭐⭐⭐⭐⭐ Easy swap *by A***E on August 19, 2026* If you ever left your key in the mailbox you know what a pain it is to have the post office come out and change the lock. This was cheaper than what the PO wanted, to do the same job. It took about 15 minutes to replace the old lock with the new lock. It was super easy. Sorry, no picture we all know what a mailbox looks like. ## Frequently Bought Together - CompX USPS-L-1172C National Mailbox Lock C9100 (Lock with 3-Keys) - Prime-Line S 4140 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – ILCO 1003M Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ro/products/42929162-usps-l-1172c-national-mailbox-lock-c9100-lock-with-3](https://www.desertcart.ro/products/42929162-usps-l-1172c-national-mailbox-lock-c9100-lock-with-3) --- *Product available on Desertcart Romania* *Store origin: RO* *Last updated: 2026-09-12*