Marks USA 175AB Entry Lever Lockset Grade 2 Survivor Series, American Lever, 3-Hour Fire RatedThe Marks USA 175AB is a Grade 2 cylindrical Entry Lever Lockset from the Survivor Series, engineered for commercial applications where durability and long-term performance are paramount. Featuring a unique stainless steel “clutch” mechanism and cast retractors on bronze roller bearings, this lockset exceeds BHMA Grade 1 specifications by 300%, achieving over 3.6 million cycles. Designed for door thicknesses of 1-5/8″ to 1-7/8″ (with optional K1904 spacer for 1-3/8″ doors), it accommodates 2-3/8″ and 2-3/4″ backsets and carries a 3-hour fire rating. The Marks “C” keyway 6-pin cylinder with 2 keys and ADA-compliant lever design make it a versatile, code-compliant solution for a wide range of commercial door applications.Key FeaturesExceptional Cycle Durability: Exceeds BHMA Grade 1 specifications by 300% with over 3.6 million cycles, ensuring long-term reliability in high-traffic commercial environments.Unique Clutch Mechanism: Stainless steel “clutch” disengages levers from the retractor when locked, dramatically reducing wear and abuse, eliminating lever droop, and extending product life.Cast Retractors on Bronze Roller Bearings: Solid cast Zamac levers with 1/2″ return and bronze roller bearing chassis construction deliver smooth, consistent operation over millions of cycles.Door Thickness & Backset Compatibility: Fits door thicknesses of 1-5/8″ to 1-7/8″; use K1904 spacer for 1-3/8″ doors. Accepts both 2-3/8″ and 2-3/4″ backsets for flexible installation.3-Hour Fire Rated: Certified 3-hour fire rating supports use in fire-rated door assemblies for code-compliant commercial installations.Latch & Strike Details: Includes Latch #1134 with 1-1/8″ x 2-1/4″ front, 1/2″ throw, and stainless steel nose; paired with Strike #1145 ASA strike (ANSI, 1-1/4″ x 4-7/8″, 1-1/4″ lip, square corner).Thru-Bolted Roses: 3-1/4″ diameter roses, spring-loaded with 2 #10 thru-bolts for secure, tamper-resistant mounting.Marks “C” Keyway Cylinder: 6-pin cylinder with 2 keys included; deadlocking latch type for enhanced security in entry/office applications.Lifetime Mechanical Warranty: Backed by Marks’ lifetime mechanical warranty for added confidence and long-term value.Certifications & ComplianceANSI/BHMA CertifiedUL ListedGrade 2 (Exceeds BHMA Grade 1 by 300%)3-Hour Fire RatedADA CompliantMarks Lifetime Mechanical WarrantyTechnical SpecificationsGrade: Grade 2Product Group: Mechanical LocksProduct Subgroup: Bored LocksetsANSI/BHMA: ANSI/BHMA, UL ListedCommercial/Residential: CommercialFunction Description: Pushing and turning button on inside locks outside knob/lever requiring use of a key until button is manually unlocked.ADA Compliant: YesKeyed: YesANSI Function: F109Product Function: Entrance/OfficeDoor Thickness Range: 1-3/4″Latch Type Specification: DeadlockingStrike Classification: ANSI, 1-1/4″ x 4-7/8″, 1-1/4″ Lip, Square CornerProduct Category: Mechanical LocksDepartment: Door HardwareTypical ApplicationsCommercial Office Buildings and Corporate CampusesEducational Facilities and School ClassroomsHealthcare Institutions and Medical OfficesRetail Establishments and StorefrontsGovernment and Municipal BuildingsMulti-Tenant Residential and Mixed-Use PropertiesIndustrial and Warehouse FacilitiesWhy Marks USA 175AB?Marks USA Survivor Series locksets are built around a proprietary stainless steel clutch mechanism and cast retractors on bronze roller bearings a combination that delivers over 3.6 million cycles, exceeding BHMA Grade 1 standards by 300%. With a 3-hour fire rating, ADA compliance, UL listing, and a lifetime mechanical warranty, the 175AB Entry Lever Lockset is engineered for demanding commercial environments where dependable, low-maintenance performance is non-negotiable.