Top 10 Best mailbox key lock replacement in 2026

Last Updated - 6/10/2026

🏆Best Choice

PRIME-LINE

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)

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•REPLACEMENT LOCK – This multipurpose Prime-Line replacement mailbox lock is an easy fix and can easily replace lost or broken mailbox locks. Features 5 cams and an Hudson 1003M key
•WORKS FOR SEVERAL BRANDS – This replacement mailbox lock works with several brands of mailboxes, including: American Device, Auth-Florence, Bommer, and Miami-Carey.
•INCLUDES – Replacement lock kit includes a total of 5 zinc-plated steel cams, brass pins, a spring steel locking clip and 2 keys.
•LOCKING SECURITY FEATURE – This lock has a security feature that prevents the key from being removed when in the unlocked position, which prevents forgetting the key, and ensuring the mailbox is locked every time it’s used.
•NOTE – This mailbox lock unlocks by turning the included keys in a in the counter-clockwise direction and has a retaining hex nut and retaining clip

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$9.29

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VIXAVI

Mailbox Lock Replacement - Universal Mailbox Locks with 4 Keys - Easy to Install Mail Box Lock and Key Set - Durable and Secure Lock Replacement with 4 Keys for Almost All Locking Mail Boxes

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•✅ Universal Mailbox Lock: Now you don't have to replace your entire mailbox to add an extra layer of security. Our mailbox replacement lock is carefully engineered to fit any mailbox size or type, and comes with 4 keys and five different sizes of locks.
•✅ Quick & Fuss-Free Installation: No handyman skills? No problem! You can quickly install your new mailbox lock set yourself in minutes without complex tools or professional help. Upgrade your mailbox's security and enjoy that much-needed peace of mind.
•✅ The Last Mailbox Lock You Will Ever Need: Built with reliability and long-term durability in mind, our rust-resistant mailbox key lock will handle daily wear and tear without skipping a beat, ensuring your mailbox remains functional for years to come.
•✅ Protecting Your Mail Has Never Been Easier: Prevent theft or unauthorized access to your mail with our secure mailbox lock, which is both skid- and destruction-resistant. Keep your private documents and deliveries safe with an ultra-secure mail box lock.
•✅ Sleek & Modern Design: Boasting a modern aesthetic that combines style and functionality, this mailbox lock replacement kit will take your mailbox's overall appearance to the next level. Add a touch of elegance to your mailbox today with our stylish mailbox lock.

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$9.99

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COMPX NATIONAL

CompX USPS-L-1172C National Mailbox Lock C9100 (Lock with 3-Keys)

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Includes spring clip, mounting nut and (3) keys
•Does not include cam/latch
•C9100 operates clockwise

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$20.99

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Yandino

Mailbox Lock Replacement with 4 Keys - Multipurpose Mail Box Locks Compatible with Almost All Brands - Universal Lock Pick Set - File Cabinet Lock - Easy to Install - Durable and Secure

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Multipurpose Mailbox Lock: Enhance your mailbox security without replacing the entire mailbox.Our mailbox locks with keys replacement is designed to fit various mailbox sizes and types, complete with 4 keys and 5 different cams for a perfect fit.
•Mailbox Lock Replacement:You can install your new mailbox lock set in minutes, all by yourself, without the need for complicated tools or professional assistance.
•Mail box lock and key –This Replacement lock kit i a total of 5 zinc-plated steel cams, brass pins, a spring steel locking clip and 4 keys.UThis mail box lock and key unlocks by turning the included keys in a in the counter-clockwise direction. It can double as an office filing cabinet lock. For exact dimensions, refer to our detailed product images.
•Durable & Reliable: Constructed for longevity and reliability, our rust-resistant mailbox lock can withstand daily use, ensuring your mailbox remains secure and functional for years.
•Enhanced Mail Protection: Safeguard your mail from theft and unauthorized access with our secure mailbox lock. Its skid-resistant and destruction-resistant features help keep your important documents and deliveries safe.

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$8.69

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PRIME-LINE

Prime-Line S 4573 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – NA-14 Keyway, Opens Counter-Clockwise with 90º Rotation, Nickel Finish (1 Set)

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•REPLACEMENT LOCK – This multipurpose Prime-Line replacement mailbox lock is an easy fix and can easily replace lost or broken mailbox locks. Features 5 cams and an NA-14 key
•WORKS FOR SEVERAL BRANDS – This replacement mailbox lock works with most brands of mailboxes.
•BUILT TO LAST – The mail box lock and key set is constructed of diecast, brass, steel, and stamped steel materials; the steel components come finished in a corrosion-resistant zinc-plated finish; the cylinder face comes in a nickel-plated finish
•LOCKING SECURITY FEATURE – This lock has a security feature that prevents the key from being removed when in the unlocked position, which prevents forgetting the key, and ensuring the mailbox is locked every time it’s used.
•NOTE – This mailbox lock unlocks by turning the included keys in a in the counter-clockwise direction and has a retaining hex nut and retaining clip

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$7.47

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Cylinnda

2 Pack Tool Box Lock with Keys, 5/8" Cabinet Lock Cam Lock Keyed Alike, Toolbox Lock Replacement Lock for Mailbox RV Storage Door with Manual, Zinc Alloy (2Pack，5/8 Inch)

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•【CHECK BEFORE PURCHASE】Please read size guidance before purchase, choose correct lock size according to both your latching distance & door thickness. Make sure both measurement fits. Latching distance measure from the front of the door face to the latch locking-up position. RV storage locks work for a standard mounting hole of 3/4 inch diameter. Installation is quick and easy, opens with a 90 degree turn, key is removable at unlocked position.
•【PREMIUM QUALITY】RV compartment locks are made of premium zinc alloy, strong material makes it sturdy and durable for long-life time service. Rustproof & waterproof chrome plating protect the lock body to handle harsh outdoors. Tubular cam locks adopted advanced lock technology, keep your valuables safe and help you travel worry free with loved ones.
•【WIDE APPLICATIONS】The RV cabinet lock set comes in various lengths and upgraded lock arms. Our straight lock arm is designed with 3 mounting holes, can be adjusted to 2 different lengths for your installation needs. Tubular cam lock is not only perfect for new installation but also best choice for RV Camper/ Travel Trailer/ Truck/Boat storage compartment door, utility doors, tool box lock replacement, locker doors, rv cabinets, vending machines, drawers, mailbox.
•【UPGRADED SECURITY】Better security than the CH751 OEM locks and keys which everyone’s got, you will get your own unique keys and all keys are keyed alike in each package. Cabinet locks keyed alike means one key can open all locks in the same rv cam locks set. You’ll get enough spare keys which is really safe and convenient.
•【SATISFACTORY GUARANTEE】If you’re not satisfied with your purchase for any reason, or if you have any questions, please contact us. We provide 30-day money back, lifetime warranty and 24/7 online friendly customer service.

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$10.44

$10.99

-5%

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Ymtzfu

1 Pack Mailbox Lock with Key, Mailbox Lock Replacement for L-1172C Mailbox Key Lock, Nickel Finish

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•HIGH QUALITY: The L-1172C mailbox lock replacement is made of the finest materials with a rolled nickel surface to ensure durability and long-lasting performance, perfect replacement for your old mailbox lock ideally.
•SECURITY: Replace your mailbox lock and upgrade your mailbox security immediately. Avoid the worry of not being able to access your valuable mail.
•EASY TO INSTALL: The keyed mailbox lock includes a full range of accessories, no need to hire a professional locksmith, you only need 5 minutes to complete your mailbox lock installation or replacement, eliminating the need for a complicated installation process (refer to the instructions in the attached picture).
•COMPATIBILITY: The versatile design of the mailbox lock ensures compatibility with a wide range of mailbox models.
•WHAT YOU GET: 1 pack of mailbox locks includes 1 lock cylinder, 3 keyed alike, 5 shaped locking tabs and 1 nut.If you order more than one set of locks, each set has a different key between the locks and will not pass through to the other locks.
•SERVICE: mailbox replacement locks are USPS compliant and perfect for replacing C9100 mailbox key locks. If there is any problem, please feel free to contact us, we will solve it for you in time.

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$16.99

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PRIME-LINE

Prime-Line MP4945 Mail Box Lock, 5-Cam, 5-Pin, 13/16 In. Threaded, Counter-Clockwise (Single Pack)

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Diecast construction
•Nickel plated face
•Counter-clockwise rotation
•Spring steel locking clip
•Can eliminate stocking of individual locks

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$6.30

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PRIME-LINE

Prime-Line MP4946 Mailbox Lock, 1-9/16 In. Cam Reach, Diecast Construction, Nickel (Single Pack)

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Used to replace damaged or missing mailbox locks by Cutler Federal
•This mailbox lock mounts with a spring steel locking clip, included with item
•This mailbox lock rotates in a counter clockwise direction to lock
•Diecast construction with brass pins and a nickel plated face
•Can eliminate stocking of individual locks
•1-9/16 inch reach of cam
•No tools are required for installation
•Please refer to the line art drawing for dimensions and compare with your needs before ordering

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$6.12

$6.99

-12%

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PRIME-LINE

Prime-Line MP4526 Mailbox Lock – Replacement, Multipurpose Mailbox Lock for Several Brands – NA-14 Keyway, Opens Clockwise with 90º Rotation, Nickel Finish (1 Set)

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•REPLACEMENT LOCK – This multipurpose Prime-Line replacement mailbox lock is an easy fix and can easily replace lost or broken mailbox locks. Features 5 cams and an NA14 key
•WORKS FOR SEVERAL BRANDS – This replacement mailbox lock works with several brands of mailboxes, including: Auth-Electric, Bommer, Cutler-Federal, Florence and Superior.
•INCLUDES – Replacement lock kit includes a total of 5 zinc-plated steel cams, brass pins, a spring steel locking clip and 2 keys.
•LOCKING SECURITY FEATURE – This lock has a security feature that prevents the key from being removed when in the unlocked position, which prevents forgetting the key, and ensuring the mailbox is locked every time it’s used.
•NOTE – This mailbox lock unlocks by turning the included keys in a in the clockwise direction and features a dust cover and a retaining clip

View offer on:

$7.69

$8.99

-14%

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