Sargent 579-2 Mortise Lock Spindle Kit | For Modern 8100 Series

The Sargent 579-2 is a genuine OEM replacement threaded spindle kit specifically engineered for Sargent 8100 Series Mortise Locks. This kit is designed for locks manufactured after January 1, 1990. As the primary drive connection between your door levers and the internal mortise chassis, the 579-2 ensures that every turn of the handle results in a smooth, reliable latch retraction. If your lever handles are spinning without opening the door, a worn or stripped spindle is the likely cause.

Specialized Engineering for Modern Hardware

• Post-1990 Compatibility: Custom-tailored to the updated internal hub specifications of the modern 8100 series, ensuring precise mechanical timing that generic spindles cannot match.
  
• Threaded Design: Features a threaded profile that allows for fine-tuned adjustment of the lever reach, ensuring a tight, "factory-fresh" fit against the rose or escutcheon.
  
• Standard Door Fit: Precision-sized for 1-3/4" thick doors, the industry standard for commercial, industrial, and institutional entryways.
  
• Institutional Grade Strength: Forged from high-tensile steel to withstand the high-torque demands of constant daily use in high-traffic environments.
• OEM Reliability: Using a genuine Sargent part maintains the original UL fire-rating and mechanical warranty of your 8100 series lockset.

Technical Specifications

• Model Number: 579-2
• Series Compatibility: Sargent 8100 Series Mortise Locks
• Manufacture Date Range: Post-January 1, 1990
  
• Door Thickness: 1-3/4"
• Spindle Type: Threaded / Divided
• Standard Code: UNSPSC 46171500

The Sargent 579-2 is a critical maintenance item for modern facilities. Unlike older dimpled versions, the threaded spindle allows for minute adjustments to ensure the levers are perfectly flush. If you notice your handles feel loose or have excessive "in-and-out" play, your spindle may be improperly adjusted or the threads may be beginning to fatigue.

Installation Note: To prevent the levers from backing off the spindle over time, ensure the lever set screws are tightened firmly into the threaded grooves. For maximum lockset stability, the rose or escutcheon plates must be clamped securely to the door leaf using high-strength thru bolts. A stable, thru-bolted mounting prevents the trim from shifting, which protects the 579-2 spindle from lateral "binding" and premature thread wear.