Marks USA MAR175T 175T Corridor Lever Lockset — Survivor Series, Clutch Mechanism, ADA Compliant, Grade 1

Marks USA 175T Corridor Lever Lockset — Survivor Series, Clutch Mechanism, ADA Compliant

The Marks USA 175T is a Grade 1 Survivor Series Corridor Lever Lockset engineered for demanding commercial environments where durability and low maintenance are essential. Featuring a unique clutch mechanism, the levers disengage from the retractor and interior lock components when locked, allowing them to swing freely without resistance — eliminating lever droop and dramatically reducing wear on internal components. Designed for doors 1-5/8" to 1-7/8" thick (with optional K1704 spacer for 1-3/8" doors), this cylindrical lockset ships with a 2-3/4" backset and a MARKS "C" keyway 6-pin cylinder with 2 keys. ANSI/BHMA certified and UL Listed, it meets the rigorous demands of asylum, institution, and utility applications.

Key Features

• Innovative Clutch Mechanism: When locked, levers disengage from the retractor and interior mechanisms, allowing free swing without resistance — eliminating lever droop and reducing long-term wear on lock components.
• Door Thickness Compatibility: Accommodates doors 1-5/8" to 1-7/8" thick; use K1704 spacer for 1-3/8" doors for versatile installation across door types.
• Backset & Latch Specifications: 2-3/4" backset with Latch #1134 featuring a 1-1/8" x 2-1/4" front, 1/2" throw, and stainless steel nose for reliable latching performance.
• Solid Cast Zamac Levers: Levers are constructed from solid cast Zamac with a 1/2" return (except models 370 & 470), providing exceptional strength and a professional appearance.
• Thru-Bolted Rose Design: 3-1/4" diameter roses are spring-loaded and secured with 2 #10 thru-bolts for a secure, tamper-resistant installation.
• MARKS "C" Keyway Cylinder: 6-pin cylinder with MARKS "C" keyway and 2 keys included; ANSI Function F87 — deadlocking latch bolt operated by key in lever from either side with both levers always inoperable.
• ASA Strike Included: Ships with Strike #1145 ASA strike, classified ANSI 1-1/4" x 4-7/8", 1-1/4" lip, square corner for standard door frame compatibility.
• ADA Compliant: Lever design meets ADA accessibility requirements, making it suitable for public and commercial facilities requiring accessible hardware.

Certifications & Compliance

• Grade 1 — ANSI/BHMA Certified
• UL Listed
• ADA Compliant
• ANSI Function F87 — Asylum/Institution/Utility

Technical Specifications

• Grade: Grade 1
• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• Product Type: Cylindrical Locks
• Subcategory: Cylindrical Locks
• ANSI/BHMA: ANSI/BHMA, UL Listed
• Commercial/Residential: Commercial
• Function Description: Deadlocking latch bolt operated by key in lever from either side. Both levers are always inoperable.
• ADA Compliant: Yes
• Keyed: Yes
• ANSI Function: F87
• Product Attribute: Cylindrical Locks
• Product Function: Asylum/Institution/Utility
• Door Thickness Range: 1-3/4"
• 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

• Asylum and Institutional Facilities
• Healthcare and Hospital Environments
• Educational Institutions and Schools
• Government and Municipal Buildings
• Commercial Office Buildings
• Utility and Maintenance Areas
• Multi-Tenant Residential and Mixed-Use Properties

Why Marks USA 175T?

Marks USA 175T Survivor Series locksets are built around a patented clutch mechanism that sets them apart from conventional cylindrical lever locks — when locked, levers disengage entirely from internal components, eliminating the wear, lever droop, and maintenance cycles that plague standard lever sets. Constructed with solid cast Zamac levers, thru-bolted roses, and a stainless steel latch nose, the 175T delivers Grade 1, ANSI/BHMA-certified, UL Listed performance engineered for the most demanding commercial and institutional applications.