Marks USA MAR175B 175B Entry Lever Lockset — Survivor Series, Grade 2, Clutch Mechanism, 3-Hour Fire Rated

Marks USA 175B Entry Lever Lockset — Survivor Series, Grade 2, Clutch Mechanism, 3-Hour Fire Rated

The Marks USA 175B is a commercial-grade cylindrical entry lever lockset from the Survivor Series, engineered for demanding applications where durability and low maintenance are essential. Built with 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. It accommodates 2-3/8" and 2-3/4" backsets, features a 1/2" latch throw with a deadlocking latch, and is rated for 3-hour fire applications — making it a reliable choice for commercial entry doors with a 1-3/4" door thickness.

Key Features

• Exceptional Cycle Durability: Exceeds BHMA Grade 1 specifications by 300% with over 3.6 million cycles, delivering 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 service life.
• Bronze Roller Bearing Construction: Cast retractors on bronze roller bearings provide a strong, durable chassis foundation for millions of cycles of smooth operation.
• Dual Backset Compatibility: Accommodates both 2-3/8" and 2-3/4" backsets for flexible installation across a wide range of door preparations.
• 3-Hour Fire Rated: Certified for 3-hour fire-rated door assemblies, supporting code compliance in commercial and institutional applications.
• Deadlocking Latch: Features a 1/2" deadlocking latch throw with a 1-1/8" x 2-1/4" front size for secure, positive latching performance.
• ADA Compliant Lever Design: American lever style meets ADA accessibility requirements, ensuring compliance for public and commercial facilities.
• Marks Lifetime Mechanical Warranty: Backed by Marks USA's lifetime mechanical warranty for added confidence and long-term value.

Certifications & Compliance

• ANSI/BHMA Certified — Exceeds Grade 1 Specifications by 300%
• UL Listed
• 3-Hour Fire Rated
• ADA Compliant
• ANSI Function F109 (Entrance/Office)
• Marks USA Lifetime Mechanical Warranty

Technical Specifications

• Latch Throw: 1/2"
• 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.
• Front Size: 1-1/8" x 2-1/4"
• 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
• Backset (Distance): 2-3/4"
• Department: Door Hardware

Typical Applications

• Commercial Office Buildings
• Educational Facilities
• Healthcare Institutions
• Retail Establishments
• Industrial and Warehouse Facilities
• Multi-Tenant Residential Properties
• Government and Municipal Buildings

Why Marks USA 175B?

Marks USA Survivor Series locksets are engineered to outlast conventional cylindrical hardware, with a patented stainless steel clutch mechanism and bronze roller bearing construction that together exceed BHMA Grade 1 cycle ratings by 300% — surpassing 3.6 million cycles. The 175B delivers professional-grade performance with 3-hour fire rating, ADA compliance, and a lifetime mechanical warranty, making it an ideal solution for demanding commercial entry applications where dependability and low maintenance are non-negotiable.