Product Description
5575NL-US10 Von Duprin 5575 Series with 550DT Night Latch Mortise Lock Device in Satin Bronze
The Von Duprin 5575NL-US10 is a narrow stile mortise lock exit device that combines the 55 Series crossbar with a heavy-duty mortise lock body for maximum latch strength. Night Latch — outside lever locks and unlocks by key, inside always free for egress. When locked, key is required for re-entry from outside. Ships less cylinder — order a mortise cylinder separately to match your existing keyway.
The 5575 pairs the traditional crossbar activation with mortise-grade latching — a step up from rim devices when the door sees heavy traffic or requires the security of a mortise lockset. Requires full mortise pocket prep. This is a handed device — verify RHR or RHR before ordering. UL listed for panic exit hardware with hex key dogging standard. ANSI/BHMA A156.3 Grade 1 certified.
Pro-Tip from Our Locksmiths: The 5575 pairs the 55 Series crossbar with a heavy-duty mortise lock body. That means you get mortise-grade latch strength plus the wide "strike zone" of the crossbar. Spec this when the door sees serious traffic — think hospital corridors or courthouse entries with narrow stile glass doors.
| Specifications | |
|---|---|
| Part Number | 5575NL-US10 |
| Function | NL - Night Latch |
| Grade | ANSI/BHMA A156.3 Grade 1 |
| Minimum Stile Width | 1-3/4" (44mm) |
| Door Material | Aluminum, Glass, Hollow Metal |
| Outside Trim | Included |
| Warranty | 5-Year Mechanical |
- Narrow stile crossbar design — fits door stiles as narrow as 1-3/4"
- Mortise lock body provides superior latch strength vs. rim devices
- Hex key dogging standard — holds latch retracted during business hours
- Handed device — factory-set for RHR or RHR
- Satin Bronze (US10/612) finish
Works With: Add outside trim separately: 550DT Dummy Pull, 555NL Night Latch Pull, or 379L Lever Trim. The 55 Series uses dedicated narrow stile trim — standard 99 or 33A trim will NOT fit. Cover plate 589 required for wood door installations. For rim-mount option, see the 55 Series Rim. For concealed top-and-bottom latching, see the 5547 CVR.
Free Expert Support — As an authorized Von Duprin distributor, Lock Depot provides full manufacturer warranty coverage and same day shipping on most orders. Call (877) 365-5625 for personalized help.
Image shown is representative of the product line. Actual finish, trim, and configuration may vary by SKU.
