Prime Line Products S 4125C 5-pin Tumbler Mailbox Lock

Product Description

The PRIME LINE PRODUCTS S 4125C is a 5-pin tumbler mailbox lock designed as a direct replacement for Bommer locks. The cylinder is die cast with a nickel-plated face for corrosion resistance. Internal components include brass pins, plated steel cams, and spring steel locking clips. The lock opens with a 90-degree counter-clockwise turn, and the locked position is to the left. Each unit includes one lock and two keys. Lock body length is 0.875 inches and cam length is 1.219 inches. This part is installed by locksmiths, property maintenance technicians, and general contractors servicing residential or commercial mailbox banks.

The S 4125C is suited for standard mailbox applications where a reliable pin tumbler cylinder is required. Its plated steel cams and spring steel locking clips make it appropriate for moderate-duty use in both indoor mail centers and exterior weather-exposed installations. The 90-degree counter-clockwise open direction is a common configuration in cluster mailbox units and wall-mount mailbox enclosures.

Key Features

• 5-pin tumbler cylinder provides reliable key control
• Die cast cylinder body with nickel-plated face for corrosion resistance
• Brass pins for smooth, consistent key operation
• Plated steel cams and spring steel locking clips for secure latching
• Opens 90 degrees counter-clockwise; locked position is left
• Includes 1 lock and 2 keys per unit

Compatibility

Direct replacement for Bommer locks in standard mailbox applications requiring a 5-pin tumbler cylinder with 0.875-inch lock length and 1.219-inch cam length.

Installation Notes

Installation is typically performed by a locksmith or maintenance technician. Remove all mail and power down any associated electronic access panels before beginning work. Use appropriate cam-removal tools to avoid damaging the cylinder housing during swap-out. Verify that the replacement cam length matches the door thickness of the mailbox before finalizing installation.