Marks USA 110F Storeroom Cylindrical Knob Lock, Marks C Keyway, 6 Pin, Keyed Different, 2-3/4" Backset, T-Strike, Grade 2

Marks USA 110F Storeroom Cylindrical Knob Lock — Marks C Keyway, 6 Pin, 2-3/4" Backset, Grade 2

The Marks USA 110F is a commercial-grade storeroom cylindrical knob lock engineered for demanding environments where durability and long-term reliability are essential. Featuring a Marks "C" keyway with a 6-pin cylinder and 2 keys included, this lock is supplied keyed different and accommodates both 2-3/8" and 2-3/4" backsets. The lock chassis is constructed with cast retractors on bronze roller bearings, delivering performance that exceeds BHMA Grade 1 specifications by 300% — over 3.6 million cycles. Designed for doors with a thickness range of 1-5/8" to 1-7/8", the 110F is 3-hour fire rated and backed by the Marks lifetime mechanical warranty.

Key Features

• Exceptional Cycle Durability: Exceeds BHMA Grade 1 specifications by 300%, tested to over 3.6 million cycles for outstanding long-term reliability in high-traffic commercial applications.
• Dual Backset Compatibility: Accommodates both 2-3/8" and 2-3/4" backsets, providing flexible installation options across a wide range of door preparations.
• Door Thickness Range: Designed for doors 1-5/8" to 1-7/8" thick, suitable for standard commercial door applications.
• Precision Cylinder: Marks "C" keyway, 6-pin cylinder supplied with 2 keys, keyed different for individual door security management.
• Heavy-Duty Knob & Rose Construction: 2-1/4" diameter (110) round knob with steel-reinforced adjustable roses measuring 2-3/4" diameter on both sides for a secure, finished appearance.
• Stainless Steel Latch Assembly: Latch #1138 features a 1" x 2-1/4" front with a 1/2" throw and stainless steel nose; includes Strike #1136, a 2-3/4" "T" strike for reliable latching.
• 3-Hour Fire Rated: Certified for 3-hour fire-rated door assemblies, supporting life-safety compliance in commercial buildings.
• Lifetime Mechanical Warranty: Backed by the Marks lifetime mechanical warranty, providing long-term confidence and protection for commercial installations.

Certifications & Compliance

• ANSI/BHMA Grade 2 Certified
• UL Listed
• 3-Hour Fire Rated
• Exceeds BHMA Grade 1 Specification by 300% (3.6 million cycles)
• Marks Lifetime Mechanical Warranty

Technical Specifications

• Series: 10 Series
• Product Group: Mechanical Locks
• ANSI/BHMA: ANSI/BHMA, UL Listed
• Commercial/Residential: Commercial
• Function Description: Latch retracted by knobs/levers at all times
• Front Size: 1-1/8" x 2-1/4"
• Keyed: No
• Product Function: Passage/Hall/Closet
• Latch Type Specification: Deadlocking
• Product Category: Mechanical Locks
• Department: Door Hardware

Typical Applications

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

Why Marks USA 110F?

Marks USA cylindrical locksets are built on a foundation of cast retractors and bronze roller bearings — a construction approach that delivers performance exceeding BHMA Grade 1 standards by 300%, with over 3.6 million tested cycles. The 110F storeroom knob lock combines this proven chassis with a 6-pin Marks "C" keyway cylinder, 3-hour fire rating, and a lifetime mechanical warranty, making it a dependable choice for commercial door hardware professionals who demand lasting performance and code compliance.