Dormakaba QCL171M626 S4 Nos Lc Storeroom Lever Lock Grade 1

Product Description

The DORMAKABA QCL171M626 S4 NOS LC is a Grade 1 heavy-duty cylindrical storeroom lever lock designed for high-traffic commercial door applications. Built on the QCL100 series platform, it features the Summit lever on a rose trim and a deadlatch with a 2.75-inch backset. The storeroom function keeps the exterior lever locked at all times, requiring a credential to gain entry, while the interior lever allows free egress. Finished in 626 Satin Chrome, it ships without a cylinder or strike plate, giving installers flexibility to specify their own cylinder core and frame hardware. Licensed ANSI Grade 1 and UL/cUL Listed for 3-hour fire door assemblies.

This lock is suited for commercial interior and perimeter doors where controlled access and durability are required. Typical installations include storerooms, server rooms, supply closets, and other restricted-access spaces in office buildings, healthcare facilities, schools, and retail environments. The deadlatch design resists latch manipulation under heavy use. Door thickness compatibility runs from 1.375 inches to 2 inches, covering most standard commercial hollow-metal and solid-core wood door preps. The less-cylinder configuration accommodates facility standardization on a specific keyway or interchangeable-core system.

Key Features

• ANSI/BHMA Grade 1 rating for heavy-duty commercial performance
• Storeroom function — exterior lever always locked, free egress from interior
• Deadlatch latchbolt resists shimming and latch manipulation
• UL/cUL Listed 3-hour fire door assembly rating; meets California Title 19
• Less cylinder — accepts field-specified cylinder for keyway or interchangeable-core flexibility
• 626 Satin Chrome finish on Summit lever and rose trim
• Ships less strike for installer-selected frame hardware

Compatibility

Designed as an OEM-style replacement or new-installation cylindrical lock for commercial doors with a standard 2.75-inch backset prep and a door thickness range of 1.375 inches to 2 inches in Grade 1 commercial applications.

Installation Notes

Installation should be performed by a licensed locksmith or qualified commercial door hardware installer in accordance with applicable building and fire codes. Verify door prep dimensions — backset, cross-bore, and edge-bore — before ordering to confirm compatibility with existing door preparation. Because this unit ships less cylinder and less strike, the installer must supply and fit an appropriate cylinder and strike plate to complete the lockset assembly. Always confirm fire-label requirements with the authority having jurisdiction before installing on a rated door assembly.

Technical Specifications

• Series: QCL100
• Grade: Grade 1 (ANSI/BHMA)
• Function: Storeroom
• Lever Design: Summit with Rose
• Latchbolt Type: Deadlatch
• Backset: 2.75 inches
• Door Thickness: 1.375 inches to 2 inches
• Finish: 626 Satin Chrome (Brushed Chrome)
• Cylinder Type: Less Cylinder
• Strike: Less Strike
• Door Application: Commercial Electric Locks
• Certifications: ANSI, BHMA, California State Reference Code Title 19, UL 10b, UL/cUL Listed 3 Hour

Standard Information

• Brand: DORMAKABA
• Manufacturer Part Number: QCL171M626 S4 NOS LC