Ferco 528 / 635 Multipoint Locks - Replacement Parts

Ferco 528 and 635 Multipoint Lock Replacements for Atrium Doors

The Ferco 528 and 635 multipoint locks were widely used in Atrium wooden doors throughout the years, providing reliable security through their 4 to 5-point locking mechanisms. Since Ferco discontinued manufacturing these specific lock configurations, finding exact replacements has become increasingly difficult for homeowners and repair professionals. MPLocks maintains stock of original Ferco locks and purpose-built replacement kits that allow you to restore full functionality to your Atrium door without replacing the entire door system. These locks operate with roller cams and shootbolts that engage at multiple points along the door frame for enhanced security.

Multi-Point Locking for Enhanced Door Security

Ferco 528 locks feature either 4 or 5 locking points that include a handle-operated latch, roller cams, and shootbolts. This multi-point design distributes the locking force across the full height of the door, reducing the risk of forced entry and improving weathertight sealing. The roller cams pull the door firmly against the weatherstripping, while shootbolts extend into the frame at the top and bottom for added rigidity. When replacing these locks, maintaining this multi-point configuration ensures your door continues to perform as originally designed.

Replacement Kits for Discontinued Ferco Locks

Because original Ferco 528 locks are no longer in production, replacement kits offer a practical solution for restoring your door's functionality. The available replacement kit matches the 28mm backset and 70mm handle spacing (PZ) of the original lock, allowing for direct installation without door modifications. For taller doors exceeding 81 inches, extension components are available to accommodate the additional length. These kits include updated lock mechanisms while maintaining compatibility with your existing door prep and handle hardware.

• G-U Ferco Multipoint Lock Hardware
• Atrium Replacement Hardware
• G-U Ferco Lock Cases and Repair Parts

Measuring for Your Ferco 528 Replacement

Before ordering a replacement Ferco lock, you need to measure several key dimensions to ensure proper fit. The backset is the distance from the edge of the door to the center of the handle spindle hole, which is 28mm on these locks. The PZ measurement, or handle spacing, is the distance from the center of the handle spindle to the center of the keyhole, measuring 70mm on this configuration. You should also measure your door height to determine if you need the standard lock or require an extension for doors taller than 81 inches. The faceplate width must also match your existing mortise cutout.

If you need help confirming measurements or identifying the correct replacement for your Atrium door, call our team at (816) 221-6543 to speak with a multipoint lock specialist. You can also submit your lock details through our free Multipoint Lock Identifier for expert review and personalized recommendations.