The 4550L-01-121 from Adams Rite is a MS Deadlock Lever Left Handed for MS1850A and MS1850S in Dark Bronze Anodized. The 4550L-01-121 MS Deadlock Lever works with the MS Deadlock with approximately three pounds of downward force on a 3″ lever whereas the spring-loaded lever relocks the device with an upward motion. The indicator is self-driven by lock bolt itself which indicates lock status. It can be installed in place of existing key cylinder or cylinder type thumbturn on inside of door. Its clutching action prevents damage to internal components. The 4550 Deadlock Lever is not found compatible with 7/8″ backset locks.
Adams Rite 4550L-01-121 MS Deadlock Lever Features
- Dark Bronze Anodized Finish: Provides a stylish and durable surface that resists corrosion and wear.
- Self-Driven Indicator: The lock bolt itself powers the indicator, ensuring accurate lock status visibility.
- Handed Operation: Designed specifically for left-handed applications for optimal functionality.
- Reconfigurable Handing: Easily accommodates either door swing, providing versatility in installation.
- Robust Housing Dimensions: Aluminum casting housing measures 1-3/8″ wide x 7-1/2″ long x 1″ deep for strength and stability.
- Wide Compatibility: Works with MS1837, MS1850S, MS1850SN, MS1861, MS1950 Deadlocks and 1870 Series cylinder-operated Flushbolts.
- Door Thickness Compatibility: Suitable for doors ranging from 1-3/4″ to 2″ thick.
- Clear Lock Status Display: Words “LOCKED” in red or “OPEN” in black on a white background for easy visibility.
- Comfortable Lever Design: The 3″ long aluminum lever with end-return design provides a comfortable grip for operation.
- Lever Housing Projection: Projects 11/16″ forward of cylinder backset centerline, allowing for easy access.
Adams Rite 4550L-01-121 Detailed Specifications
| Finish | Dark Bronze Anodized |
| Handing | Left Handed |
| Housing Size | 1-3/8″ wide x 7-1/2″ long x 1″ deep |
| Compatibility | MS1837, MS1850S, MS1850SN, MS1861, MS1950 Deadlocks, 1870 Series Flushbolts |
| Door Thickness | 1-3/4″ to 2″ |
| Lever Length | 3″ long |
| Projection | 11/16″ forward of centerline |
| Lock Status Indicator | “LOCKED” in red or “OPEN” in black on white background |



















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