Marks USA MAR175DW 175DW Institution Lever Lockset — Grade 2 Survivor Series, Clutch Mechanism, 3-Hour Fire Rated

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

The Marks USA 175DW is a heavy-duty cylindrical Institution lever lockset from the Survivor Series, engineered for demanding commercial environments where durability and long-term performance are critical. Featuring a unique stainless steel "clutch" mechanism paired with bronze roller bearings on a cast retractor chassis, this lockset exceeds BHMA Grade 1 specifications by 300% — achieving over 3.6 million cycles. Designed for doors 1-5/8" to 1-7/8" thick (with K1904 spacer for 1-3/8" doors), it accommodates 2-3/4" backset and carries a 3-hour fire rating, making it ideal for institutional and high-traffic commercial applications. The Institution (DW) function features a deadlocking latch bolt operated by key in lever from either side, with both levers always inoperable.

Key Features

• Exceeds BHMA Grade 1 by 300%: Tested to over 3.6 million cycles, far surpassing standard Grade 1 requirements for exceptional long-term reliability in high-traffic environments.
• Unique Stainless Steel Clutch Mechanism: When locked, levers disengage from the retractor and interior mechanisms, swinging freely without resistance — dramatically reducing wear, abuse, and lever droop.
• Cast Retractor on Bronze Roller Bearings: All cylindrical lock chassis are constructed with cast retractors on bronze roller bearings for millions of cycles of smooth, dependable operation.
• 3-Hour Fire Rated: Rated for 3-hour fire assemblies; compatible with 2-3/8" and 2-3/4" backsets for flexible installation.
• Door Thickness Compatibility: Fits doors 1-5/8" to 1-7/8" thick; use K1904 spacer for 1-3/8" doors.
• Latch & Strike Specifications: Latch #1134 with 1-1/8" x 2-1/4" front, 1/2" throw, and stainless steel nose; Strike #1145 ASA strike included.
• Solid Cast Zamac Levers: Levers feature solid cast Zamac construction with 1/2" return for durability and a professional appearance.
• Thru-Bolted Roses: 3-1/4" diameter, spring-loaded roses secured with 2 #10 thru-bolts for a secure, tamper-resistant installation.
• Marks Lifetime Mechanical Warranty: Backed by Marks USA's lifetime mechanical warranty for long-term confidence and protection.

Certifications & Compliance

• ANSI/BHMA Certified — Exceeds Grade 1 Specifications by 300%
• UL Listed
• 3-Hour Fire Rated
• ADA Compliant
• ANSI Function F87 (Asylum/Institution/Utility)
• Marks USA Lifetime Mechanical Warranty

Technical Specifications

• Product Group: Mechanical Locks
• Product Subgroup: Bored Locksets
• 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 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

• Healthcare and Hospital Facilities
• Correctional and Detention Institutions
• Educational Facilities and Schools
• Government and Municipal Buildings
• Commercial Office Buildings
• Multi-Tenant Residential and Assisted Living Properties
• Industrial and High-Traffic Commercial Environments

Why Marks USA 175DW?

Marks USA Survivor Series locksets are built to outlast the competition, with a proprietary stainless steel clutch mechanism and bronze roller bearing chassis that together exceed BHMA Grade 1 specifications by 300% — delivering over 3.6 million cycles of reliable performance. The 175DW Institution lockset is engineered for the most demanding commercial and institutional environments, combining 3-hour fire rating, ADA compliance, UL listing, and a lifetime mechanical warranty into a single, professionally-grade solution.