Prime Line Products S 4129C 5-pin Tumbler Mailbox Lock

Product Description

The PRIME LINE PRODUCTS S 4129C is a 5-pin tumbler mailbox lock designed as a direct replacement for American Device mailbox lock cylinders. The cylinder body is die cast with a nickel-plated face, brass pins, plated steel cams, and spring steel locking clips. The lock opens 90 degrees counter-clockwise from the locked position, which sits at the left. Each unit ships with one lock and two keys. This lock is a standard service part installed by locksmiths, property maintenance technicians, and postal equipment service professionals.

This replacement lock is suited for residential and light commercial mailbox applications that originally used American Device cylinder locks. Typical install scenarios include apartment complex mailbox banks, standalone curbside mailboxes, and multi-tenant mail centers. The lock length is 0.4375 inches and the cam length is 1.4375 inches, making it a compact, direct-fit unit for standard mailbox door thicknesses.

Key Features

• 5-pin tumbler cylinder for reliable key control and pick resistance
• Die cast cylinder body with nickel-plated face for corrosion resistance
• Brass pins and plated steel cams for durability in frequent-use applications
• Spring steel locking clips included for secure retention in the mailbox door
• Opens 90 degrees counter-clockwise; locked position at left
• Includes 1 lock and 2 keys per unit

Compatibility

Designed as an OEM-style replacement for American Device mailbox locks. Replaces American Device cylinder lock assemblies in standard mailbox door applications.

Installation Notes

Installation is typically performed by a locksmith or maintenance technician. Remove the existing cylinder using the appropriate cam removal tool before inserting the replacement lock. Ensure the mailbox door panel is clear of obstructions and that spring steel locking clips seat fully before returning the unit to service. No special certifications or codes govern residential mailbox lock replacement, though USPS-approved installations should be verified against current postal service guidelines.