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Sargent LC-12-8904-J-ETB Fire Rated Mortise Exit Device, Night Latch, For 37-42" Dr Widths, Less Cylinder
The Sargent LC-12-8904-J-ETB is a fire-rated mortise exit device built for high-traffic commercial openings that demand reliable security and code compliance. Designed as a night latch function, it provides exterior key access through the J escutcheon trim while maintaining free egress from the inside at all times. This device accommodates door widths from 37" to 42" and ships less cylinder, giving you the flexibility to pair it with your preferred keying system. As part of Sargent's robust 8900 series, it delivers the durability and heavy-duty performance expected in demanding institutional, educational, and commercial environments.
Features
- Fire-rated mortise exit device suitable for labeled fire door assemblies.
- Night latch (NL) function allows key retraction of the latch from the exterior.
- ETB design trim with J escutcheon for a clean, durable appearance.
- Sized for door widths ranging from 37" to 42".
- Supplied less cylinder for compatibility with your keying requirements.
- Heavy-duty construction engineered for high-use commercial openings.
Functional Details
The 04 night latch function provides secure key access from the outside while permitting free egress from the inside. Turning the key retracts the latch, allowing entry; pushing the touchpad from the interior always allows exit.
- Key outside unlocks (retracts latch).
- Latchbolt retracted by key from outside.
- Free egress at all times by depressing the push pad.
Included Components
This device includes the 8900 series mortise exit chassis, the ETB night latch trim with J escutcheon, and the necessary mounting hardware. A mortise cylinder is required but not included.
| Manufacturer | Sargent |
|---|---|
| SKU | LC-12-8904-J-ETB |
| Series | 8900 Mortise Exit Device |
| Function | Night Latch (04) |
| Grade | ANSI/BHMA Grade 1 |
| Fire Rating | Fire Rated |
| Origin | Made in USA |
| Unit of Measure | Each |
| UL Listing Type | UL Listed for Fire Exit Hardware |
| ANSI Number | A156.3 |
| BAA Qualified | Yes |
| Limited Warranty | Yes |
| Lock Type | Mortise |
|---|---|
| Door Width Range | 37" to 42" |
| Cylinder | Less Cylinder |
| Trim Type | ETB with J Escutcheon |
| Device Length | Sized for 37"–42" door widths |
| Latchbolt Throw | 3/4" |
| Minimum Stile Width | Consult factory for specific application |
| Mounting | Surface mounted with concealed fasteners |
| Handing | Non-handed |
| Cylinder Type Required | Mortise cylinder |






