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Sargent 487 Classroom Deadlock — Single Cylinder, LA Keyway
The Sargent 487 is a heavy-duty, single-cylinder classroom deadlock engineered for institutional and commercial door applications where keyed deadbolt control is required from the outside with interior thumb-turn operation. Built on the Sargent 480/580 Series platform, the 487 is the go-to deadbolt for schools, universities, government buildings, and commercial facilities that demand reliable deadlocking performance in a proven, service-friendly package.
Function Explanation — Classroom Deadlock (ANSI F29 / Sargent Function 03F)
The Classroom Deadlock function (ANSI/BHMA F29, Sargent 03F equivalent) operates as follows:
- Outside: Key retracts and projects the deadbolt — the cylinder provides full deadbolt control from the keyed side.
- Inside: Thumb turn retracts the deadbolt only — it cannot project the deadbolt, preventing accidental lockout from the inside.
- No latch bolt: This is a deadbolt-only lock — there is no latch mechanism. The deadbolt must be deliberately operated to lock or unlock the door.
This function is ideal for classroom corridor doors, storage rooms, and secured areas where staff need key control from the corridor while occupants can freely exit via the thumb turn without a key.
Key Benefits
- Commercial-grade deadbolt construction — Sargent 480/580 Series platform, designed for high-cycle institutional use
- Single-cylinder with thumb turn — Key control from outside; free egress from inside via thumb turn
- LA Keyway — Sargent standard keyway for integration into existing Sargent key systems; compatible with master keying
- Classroom Deadlock function — Inside thumb turn retracts bolt only (cannot project), reducing risk of accidental lockout
- Stable product platform — Sargent 480/580 Series deadbolts maintain long-term parts availability, supporting cost-effective field service and rekeying
Typical Applications
- K–12 and higher-education classroom corridor doors
- Government and municipal facility secured rooms
- Commercial office suite entry doors
- Storage and utility room doors requiring keyed deadbolt control
- Retrofit replacement for existing single-cylinder classroom deadlocks
Technical Details
| Feature | Details |
|---|---|
| Manufacturer | Sargent (ASSA ABLOY) |
| Model / Series | 487 — 480/580 Series Deadlock |
| Lock Function | Classroom Deadlock — Single Cylinder with Thumb Turn (ANSI F29 / Sargent 03F equivalent) |
| Cylinder Configuration | Single Cylinder (key outside, thumb turn inside) |
| Keyway | LA (Sargent standard keyway) |
| Bolt Type | Deadbolt only (no latch bolt) |
| Inside Operation | Thumb turn retracts deadbolt only; cannot project deadbolt |
| Outside Operation | Key retracts and projects deadbolt |
| Product Category | Commercial Deadbolt / Auxiliary Lock |
| Typical Applications | Classroom, institutional, commercial corridor doors |
For facilities already on a Sargent LA keyway master key system, the 487 integrates directly without rekeying the existing system. Contractors and specifiers sourcing this unit for school security upgrades or commercial deadbolt replacements can confirm keyway and finish requirements prior to ordering. DoorwaysPlus can also quote comparable classroom deadlock solutions from other preferred commercial hardware lines — contact our team for alternatives if project specifications allow substitution.
| 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 |
| Series | Sargent - 480 Series |
| Deadlock Grade | Grade 1 - Hv Dty |
| Deadbolt Function | Classroom w/Thumbturn |
| Cylinder Options | LA Keyway |
| Backset | 2-3/4" Backset |
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