Sargent 82-3645 Spring Cartridge Assembly for 8200 & 7800 Series Mortise Locks

The Sargent 82-3645 is a genuine OEM replacement spring cartridge assembly designed for Sargent 8200 Series and 7800 Series mortise locks. Sourced directly from Sargent Manufacturing, this factory-original component ensures precise fit and reliable performance — maintaining the mechanical integrity your mortise lock hardware demands. Whether you are restoring proper latch function or performing preventive maintenance on a commercial door lock, the 82-3645 delivers the exact specification required for a true like-for-like replacement.

Institutional Grade Features & Benefits

• Genuine OEM Part: Manufactured by Sargent to original factory tolerances, ensuring a drop-in fit with no modification required.
• Restores Proper Latch Function: Replaces a worn, fatigued, or broken spring cartridge to bring your mortise lock back to full operational condition.
• Broad Series Compatibility: Engineered for use across the Sargent 8200 Series and 7800 Series mortise lock product families — widely deployed in commercial, institutional, and government facilities.
• Long-Term Reliability: Built to Sargent quality standards, providing consistent spring tension cycle after cycle in high-traffic door applications.
• Cost-Effective Maintenance Solution: Replacing a single spring cartridge assembly extends the serviceable life of the mortise lock body, avoiding costly full-unit replacement.
• Simplified Procurement: A stocked OEM component that facilities managers, locksmiths, and door hardware professionals can source directly under part number 82-3645.

Compatible Lock Functions

Compatible 8200/7800 Series mortise lock functions: 8228.

Parts List Illustration

Technical Details