The MS-1891-4015-628 from Adams Rite is a Lockset for 1-1/2″ Backset in Clear. The MS-1891-4015-628 series Deadlock/Deadlatch provides a maximum security deadlock for after hour and traffic control convenience during business hours. It operates in such a way that the 360 degree turn of key or thumb turn throws or retracts the hook-shaped deadlock and then 120 degree further turn retracts latch bolt as well. Cylinder may accept any standard 1-5/32″ diameter mortise cylinder or thumb turn from either or both sides. Handle retracts spring-loaded latchbolt only.
Adams Rite MS-1891-4015-628 Lockset Features
- Clear Anodized finish: Offers a sleek, modern appearance while enhancing resistance to wear and corrosion.
- Cylinder Backset: 1-1/2″: Designed for compatibility with standard door frames for easy installation.
- Stainless Steel Case: Built with corrosion-resistant plating measuring 1″ x 7-3/8″, ensuring durability and longevity.
- Standard Jamb Lip Length: Provides compatibility with various door jambs for versatile installation options.
- Radius Faceplate: Measures 1″ x 6-7/8″, adding aesthetic appeal while protecting the door surface.
- Handed Operation – LH or RHR: Accommodates left-hand or right-hand reverse door configurations for flexible usage.
- Cylinder Not Included: Allows for customization with any standard 1-5/32″ diameter mortise cylinder, enhancing security options.
- MS+1891 Deadlocks Compatibility: Operable by any standard 1-5/32″ diameter mortise cylinder with MS cam, providing convenience.
- Grade 1 Strength: Meets rigorous testing standards, ensuring reliable performance in high-traffic areas.
- Eight Ply Laminated Latchbolt: Features a robust design measuring 5/8″ x 1-3/8″ with a 13/16″ throw for enhanced security.
- Armored Strike: Constructed with satin stainless steel trim plate, steel mounting plate, and dust box for added strength and security.
Adams Rite MS-1891-4015-628 Detailed Specifications
| Feature | Details |
| Finish | Clear Anodized |
| Cylinder Backset | 1-1/2″ |
| Case Material | Stainless Steel with Corrosion-Resistant Plating |
| Case Dimensions | 1″ x 7-3/8″ (depth varies by backset) |
| Jamb Lip Length | Standard |
| Faceplate Radius | 1″ x 6-7/8″ |
| Handed Operation | LH or RHR |
| Cylinder Inclusion | Not Included |
| Deadlock Compatibility | Standard 1-5/32″ diameter mortise cylinder with MS cam |
| Strength Rating | Grade 1 |
| Latchbolt Material | Eight Ply Laminated Stainless Steel |
| Latchbolt Dimensions | 5/8″ x 1-3/8″ with 13/16″ throw |
| Strike Plate | Armored with Satin Stainless Steel Trim |



















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