Corbin Russwin CL3557-KEYED Heavy-Duty Grade 1 Storeroom/Closet Cylindrical Lever Lock with Deadlocking LatchboltCommercial-Grade Storeroom Security with ANSI/BHMA Grade 1 CertificationThe Corbin Russwin CL3557-KEYED is a heavy-duty Grade 1 cylindrical lever lock engineered for storeroom and closet applications (ANSI function F86) in demanding commercial, institutional, and multi-family environments. The lock features a deadlocking latchbolt that is operated by key in the outside lever or by rotating the inside lever, with the outside lever freewheeling in the locked position while the inside lever remains always free. Designed for doors ranging from 1-3/8″ to 1-3/4″ in thickness with a 2-3/4″ backset, the CL3557-KEYED is built on the proven CL3500 Series platform and includes a brass 6-pin cylinder with L4 keyway and two nickel silver keys. The most common configuration features the NZD Newport lever in a 626 Satin Chrome finish.Professional Features & BenefitsGrade 2 standard-duty lever lockset per ANSI/BHMA A156.2 Series 4000, Grade 2Lever Release freewheeling levers for vandal resistanceSolid cast levers with no plastic insertsThrubolts prevent chassis rotation; ensure alignment, smooth operation and long lifeNon-handed spring cassette prevents lever sag1/2″ throw latchbolt accommodates 7/8″ and 1″ edge bore preps2-3/8″, 2-3/4″, 3-3/4″ and 5″ backsets availableUL/cUL listed for 3-hour fire doors up to 4′ x 10’14 finishes plus MicroShield antimicrobial optionsHigh Security and security key systems available (Access 3, Pyramid)Five-year limited warrantyTechnical SpecificationsGrade: ANSI/BHMA A156.2 Series 4000, Grade 2Door Prep: ANSI/BHMA A156.115Handing: Non-handedDoor Thickness: 1-3/8″ to 1-7/8″ (3548mm) standard; optional 2″ 2-1/4″ (57mm)Backset: 2-3/4″ (70mm) standard; optional 2-3/8″, 3-3/4″, 5″Latchbolt: Stainless steel, 1/2″ (13mm) throwFront: Wrought brass, bronze, or stainless steel, 2-1/4″ x 1-1/8″ (standard)Strike: Wrought brass or stainless steel, ANSI curved lip, 4-7/8″ x 1-1/4″ x 1-1/4″ lip to centerCylinder: Brass, 6-pin L4 keyway, 0-bitted standardMinimum Stile: 4-1/2″ (114mm)Certifications: ANSI/BHMA A156.2 Grade 2; UL/cUL 3-hour fire rating; ADA A117.1; NFPA 80; Windstorm/Hurricane certifiedWarranty: Five-year limitedProfessional ApplicationsCommercial Office Buildings Storeroom and Supply Closet SecurityInterior Offices and Private WorkspacesApartment Complexes and Multi-Family Residential PropertiesConvalescent and Elderly Care FacilitiesHotels and Hospitality PropertiesRestaurants and Retail CentersEducational and Institutional FacilitiesWhy Choose Corbin Russwin Quality?Corbin Russwin CL3500 Series cylindrical lever locks deliver professional-grade reliability through solid cast lever construction, independent return springs, and a through-bolted chassis all certified to ANSI/BHMA Grade 1 standards for heavy-duty commercial performance. The steel substrate with zinc dichromate treatment provides corrosion resistance, while the 7 Year Limited warranty underscores the brand’s commitment to lasting quality. Engineered to complement the full Corbin Russwin cylindrical lockset family, the CL3557-KEYED is a dependable choice for facilities where consistent, secure operation is non-negotiable.