Marks USA 110AB Entry Knob Lockset — Grade 2, Round Knob, 2-3/8" Backset, Satin Stainless Steel

Marks USA 110AB Entry Knob Lockset — Grade 2 Cylindrical Knobset with 3-Hour Fire Rating

The Marks USA 110AB is a BHMA-certified Grade 2 cylindrical entry knob lockset engineered for commercial door applications. Featuring a 2-3/8" backset, a 2-1/4" diameter round knob, and a door thickness range of 1-5/8" to 1-7/8", this lockset delivers reliable entrance and office security. The unit is finished in Satin Stainless Steel and meets ANSI-A 156.2 Grade 2 Plus with a 3-Hour Fire Rating, making it suitable for fire-rated door assemblies in demanding commercial environments.

Key Features

• Backset & Door Compatibility: Standard 2-3/8" backset accommodates door thicknesses from 1-5/8" to 1-7/8"; optional E4 configuration provides a 2-3/4" backset with 1-1/8" x 2-1/4" face for alternate door preparations.
• Round Knob Design: 2-1/4" diameter (110 Series) round knob in Satin Stainless Steel finish; steel-reinforced adjustable roses on both sides measure 2-3/4" diameter for a secure, finished appearance.
• Deadlocking Latch Assembly: Latch #1138 features a 1" x 2-1/4" front with a 1/2" throw and a Stainless Steel nose for dependable deadlocking performance on every cycle.
• Entrance/Office Function (ANSI F109): Pushing and turning the interior button locks the outside knob, requiring a key for re-entry until the button is manually unlocked — ideal for office and entrance security applications.
• Secure Cylinder: Marks "C" Keyway, 6-pin cylinder supplied with 2 keys for immediate deployment and reliable key control.
• T-Strike Included: Strike #1136, 2-3/4" "T" Strike (1-1/8" x 2-3/4", 1-1/8" lip, square corner) included for complete installation readiness.
• BHMA Certified & Fire Rated: Meets ANSI/BHMA A156.2 Grade 2 Plus with a 3-Hour Fire Rating and UL Listed compliance for use on fire-rated door assemblies.

Certifications & Compliance

• ANSI/BHMA A156.2 Grade 2 Plus
• 3-Hour Fire Rating
• BHMA Certified
• UL Listed

Technical Specifications

• 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: Pushing and turning button on inside locks outside knob/lever requiring use of a key until button is manually unlocked.
• Series: 110 Series
• Keyed: Yes
• ANSI Function: F109
• Product Attribute: Cylindrical Locks
• Product Function: Entrance/Office
• Latch Type Specification: Deadlocking
• Strike Classification: T-Strike, 1-1/8" x 2-3/4", 1-1/8" Lip, Square Corner
• Product Category: Mechanical Locks
• 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 110 Series?

Marks USA 110 Series cylindrical knobsets are built to commercial-grade standards, combining a steel-reinforced rose assembly, a Stainless Steel deadlocking latch nose, and a 6-pin Marks "C" Keyway cylinder for robust, long-term performance. BHMA-certified to ANSI/BHMA A156.2 Grade 2 Plus with a 3-Hour Fire Rating and UL Listing, the 110AB is engineered to meet the security and life-safety demands of high-traffic commercial door openings.