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

Note: Finish, handing, and keying options may be available. Contact us for comparable alternatives from additional preferred lines if project specifications allow flexibility.