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The Prime-Line S 4573 Diecast 5 Pin National Keyway Mailbox Lock and Key Set makes it easy to secure your mail. It is designed for use with most mailboxes. The mailbox key set comes complete with a 5 pin mailbox lock, 5 cams, and 2 keys. These multi-cam assortments eliminate the need for individual locks. The mailbox key lock set is constructed of diecast, brass, steel, and stamped steel materials. It features a spring steel locking clip and hex securing nut. The steel components come finished in a corrosion-resistant zinc-plated finish. The cylinder face comes in a nickel-plated finish. The lock is easy to install with a few simple tools. Please refer to the line art drawing for dimensions and compare with your needs before purchasing.
From the Manufacturer
This mailbox lock features a die cast cylinder with a nickel plated face. It includes a 5-cam assortment that replaces locks from many manufacturers. A simple 90º counter clockwise rotation opens the lock.
Karma
2025-09-04 18:10:44
Fits any standard mailbox. Easy to install, 2 keys and no problems.
Beth Mandeville
2025-08-22 15:48:14
This fits the Reliant / Gibraltar lockable mailbox commonly found at big home centers. My rotating arm on the old lock was peened over and had worked lose after someone tried to break-in. Looking for an improved version the 4573 has the rotating arm bolted to the lock body. Far more robust. In addition, the key retention feature holds the key in the lock when in the open position, so your keychain doesn't fall in the snow as you are trying to retrieve your mail. A big weakness in the original lock. Only minus is that the lock is rotated 90 degrees from original with key removed. See picture. Easy install. Good value. Would buy again.
gerald v.
2025-08-18 12:40:05
these prices can get way up there, I looked at several before I got this on Amazon this is a strong replacement lock, seems to be working well, and secure
Customer
2025-08-16 15:12:45
While opening my mailbox one day, I broke the key off in the lock. The lock was old and janky anyway; I ordered one of these to replace it with. I chose this lock because the key looks the same as the key from the old lock. For lock replacement, installation was simple: simply remove the old lock, match the locking arm on the old mailbox lock to one of the five included with the set, and fasten the lock to the mailbox using the two included nuts. (A screw was alluded to in the instructions, but the actual device uses a nut instead.) It took about five minutes, including the walk to the box from my apartment and back.As compared to the old, dirty lock that this one replaced, it opens much more smoothly and reliably yet still feels very securely fastened to the door of the box. That said, I am not terribly concerned about the absolute security of this lock: if someone wanted to steal my mail, they would be much more likely to jimmy open the postal lock that opens the whole box at once. This is an easy DIY solution to a common problem that locksmiths or the post office would have charged dozens of dollars to fix.
Browser !!
2025-08-14 16:59:10
The package provide the required parts to install the new lock for mail box.
J Williams
2025-07-09 15:53:04
I had to purchase my own lock for my new mailbox and this works as great as the ones at home depot for 80$ ! Even my mailman had great comments about the quality when installing it
Lee
2025-07-06 14:05:29
The product arrived on time and it was easy to install. I recommend that at the time of installation consider that the material of the lock is weak so you can easily damaged it if you apply to much pleasure to it. Quality correspond with value of the product.
Derek
2025-07-01 14:31:29
Perfect for truck lock box
Karma
2025-06-18 18:57:59
Fits any standard mailbox. Easy to install, 2 keys and no problems.
Beth Mandeville
2025-04-30 16:56:30
This fits the Reliant / Gibraltar lockable mailbox commonly found at big home centers. My rotating arm on the old lock was peened over and had worked lose after someone tried to break-in. Looking for an improved version the 4573 has the rotating arm bolted to the lock body. Far more robust. In addition, the key retention feature holds the key in the lock when in the open position, so your keychain doesn't fall in the snow as you are trying to retrieve your mail. A big weakness in the original lock. Only minus is that the lock is rotated 90 degrees from original with key removed. See picture. Easy install. Good value. Would buy again.
gerald v.
2025-02-10 11:43:33
these prices can get way up there, I looked at several before I got this on Amazon this is a strong replacement lock, seems to be working well, and secure
Customer
2025-01-12 18:36:26
While opening my mailbox one day, I broke the key off in the lock. The lock was old and janky anyway; I ordered one of these to replace it with. I chose this lock because the key looks the same as the key from the old lock. For lock replacement, installation was simple: simply remove the old lock, match the locking arm on the old mailbox lock to one of the five included with the set, and fasten the lock to the mailbox using the two included nuts. (A screw was alluded to in the instructions, but the actual device uses a nut instead.) It took about five minutes, including the walk to the box from my apartment and back.As compared to the old, dirty lock that this one replaced, it opens much more smoothly and reliably yet still feels very securely fastened to the door of the box. That said, I am not terribly concerned about the absolute security of this lock: if someone wanted to steal my mail, they would be much more likely to jimmy open the postal lock that opens the whole box at once. This is an easy DIY solution to a common problem that locksmiths or the post office would have charged dozens of dollars to fix.
Browser !!
2025-01-05 11:23:20
The package provide the required parts to install the new lock for mail box.
J Williams
2024-12-26 14:43:09
I had to purchase my own lock for my new mailbox and this works as great as the ones at home depot for 80$ ! Even my mailman had great comments about the quality when installing it
Lee
2024-12-22 11:08:47
The product arrived on time and it was easy to install. I recommend that at the time of installation consider that the material of the lock is weak so you can easily damaged it if you apply to much pleasure to it. Quality correspond with value of the product.
Derek
2024-12-09 18:27:16
Perfect for truck lock box
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