Marks USA MAR175AB 175AB Entry Lever Lockset — Grade 2 Survivor Series, American Lever, 3-Hour Fire Rated

Marks USA 175AB Entry Lever Lockset — Grade 2 Survivor Series, American Lever, 3-Hour Fire Rated

The 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 Features

• Exceptional 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 & Compliance

• ANSI/BHMA Certified
• UL Listed
• Grade 2 (Exceeds BHMA Grade 1 by 300%)
• 3-Hour Fire Rated
• ADA Compliant
• Marks Lifetime Mechanical Warranty

Technical Specifications

• Grade: Grade 2
• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• ANSI/BHMA: ANSI/BHMA, UL Listed
• Commercial/Residential: Commercial
• Function Description: Pushing and turning button on inside locks outside knob/lever requiring use of a key until button is manually unlocked.
• ADA Compliant: Yes
• Keyed: Yes
• ANSI Function: F109
• Product Function: Entrance/Office
• Door Thickness Range: 1-3/4"
• Latch Type Specification: Deadlocking
• Strike Classification: ANSI, 1-1/4" x 4-7/8", 1-1/4" Lip, Square Corner
• Product Category: Mechanical Locks
• Department: Door Hardware

Typical Applications

• Commercial Office Buildings and Corporate Campuses
• Educational Facilities and School Classrooms
• Healthcare Institutions and Medical Offices
• Retail Establishments and Storefronts
• Government and Municipal Buildings
• Multi-Tenant Residential and Mixed-Use Properties
• Industrial and Warehouse Facilities

Why 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.