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Sargent 485 Single Cylinder Deadlock — Grade 1 Commercial Deadbolt, LA Keyway
The Sargent 485 Single Cylinder Deadlock is a heavy-duty, Grade 1 commercial deadbolt engineered for demanding door security applications. Featuring key operation from the outside and a thumbturn on the inside, the 485 delivers reliable, code-compliant deadlocking for commercial, institutional, and multi-family environments. This listing is configured with the LA keyway, part of Sargent's open conventional keyway family, making it compatible with existing Sargent LA-keyed master key systems.
As a member of the Sargent 480/580 Series deadlock family, the 485 is a proven workhorse for perimeter doors, utility rooms, storerooms, and any opening where a positive deadlock — operated by key outside and thumbturn inside — is required. Its ANSI/BHMA Grade 1 certification confirms it meets the highest performance standard for commercial door hardware.
Function Explained — Single Cylinder Deadlock (485)
The 485 function is a single cylinder deadlock with thumbturn: a keyed cylinder on the outside projects and retracts the deadbolt; a thumbturn on the inside projects and retracts the deadbolt independently. There is no latchbolt — the deadbolt is the sole locking element. This configuration is ideal for doors requiring positive key control from the exterior while allowing free egress from the interior without a key.
Key Benefits
- ANSI/BHMA Grade 1 — highest commercial duty rating for deadbolts; suitable for high-traffic and high-security openings
- Single cylinder / thumbturn — key outside, thumbturn inside; supports free egress without requiring a key from the interior side
- LA keyway — integrates into existing Sargent LA open conventional key systems; re-keying and master keying by qualified locksmiths
- 480/580 Series platform — established commercial deadlock line with a broad parts and service ecosystem
- Solid brass cylinder construction — corrosion-resistant internal components consistent with Sargent 40-Series mortise cylinder standards
- Appropriate for commercial, institutional, multi-family, and light industrial door applications
Typical Applications
- Perimeter and exterior commercial doors requiring deadlock security
- Storerooms, utility closets, and mechanical rooms
- Office suite entry doors
- Multi-family residential corridor and unit doors
- Retrofit or replacement of existing Grade 1 deadbolts on 2-3/4" backset prep doors
Technical Details
| Feature | Details |
|---|---|
| Manufacturer | Sargent (ASSA ABLOY) |
| Series / Model | 485 (480/580 Series Deadlock) |
| Function | Single Cylinder Deadlock — key outside, thumbturn inside |
| ANSI/BHMA Grade | Grade 1 (EO151) |
| Keyway | LA (Sargent open conventional keyway) |
| Backset | 2-3/4" |
| Bolt Type | Deadbolt (no latchbolt) |
| Cylinder Type | Sargent 40-Series mortise cylinder, solid brass |
| Inside Operation | Thumbturn projects and retracts deadbolt |
| Outside Operation | Key (cylinder) projects and retracts deadbolt |
| Product Category | Commercial Deadbolt / Dead Lock |
Note: Finish, handing, and keying options may be available. Contact us for comparable alternatives from additional preferred lines if project specifications allow flexibility.
| Finish with BHMA code | 626 - US26D Satin Chrome or 613E - US10BE Oil Rubbed Bronze Equal or 605 - US3 Polish Brass or 606 - US4 Satin Brass or 612 - US10 Satin Bronze |
| Brand | Sargent |
| Deadlock Grade | Grade 1 - Hv Dty |
| Deadbolt Function | Single Cylinder w/Thumbturn |
| Cylinder Options | LA Keyway |
| Backset | 2-3/4" Backset |
| Series | Sargent - 480 Series |
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