Corbin Russwin CK4310 Passage/Closet Cylindrical Lock - Grade 1, Global Knob, Non-Keyed

Corbin Russwin CK4310-NONKEYED Passage/Closet Cylindrical Knobset - Grade 1, Non-Keyed, Heavy Wrought Knob

Commercial-Grade Passage Lock for High-Traffic Institutional and Commercial Applications

The Corbin Russwin CK4310-NONKEYED is a Grade 1 passage/closet cylindrical knobset from the CK4300 Series, engineered for demanding, high-use commercial, industrial, and institutional environments. This non-keyed passage function lock operates with latchbolt retraction by knob from either side, with both knobs always free, making it ideal for unrestricted interior passage doors. Designed for door thicknesses ranging from 1-3/8" to 2" with a standard 2-3/4" backset, the CK4310 delivers reliable, code-compliant performance backed by Corbin Russwin's reputation for heavy-duty construction. The unit features heavy wrought knobs lined with steel for impact resistance and internal parts that are zinc dichromate plated for corrosion resistance.

Professional Features & Benefits

• Door Thickness Compatibility: Accommodates door thicknesses from 1-3/8" to 2", providing versatile fit across a wide range of commercial door applications.
• Standard Backset: Factory-set 2-3/4" backset with a 787F65 latch featuring a square corner front and 2-1/4" x 1-1/8" universal configuration for straightforward installation.
• Heavy-Duty Construction: Heavy wrought knobs with steel liner provide exceptional impact resistance, while zinc dichromate-plated internal parts deliver long-term corrosion resistance in demanding environments.
• Stainless Steel Latchbolt: 1/2" (13mm) stainless steel throw latchbolt ensures smooth, reliable latching performance throughout the product's service life.
• ANSI Curved Lip Strike Included: Ships with a standard ANSI curved lip strike measuring 4-7/8" x 1-1/4" x 1-1/4" lip to center for immediate installation readiness.
• Non-Handed Design: Non-handed configuration eliminates handing concerns during installation, reducing inventory requirements and simplifying the ordering process.
• Grade 1 Commercial Rating: ANSI/BHMA F75 Grade 1 certification confirms this knobset meets the highest standards for commercial-grade durability and performance.
• Manufacturer Warranty: Backed by a 3-year manufacturer warranty for added confidence and long-term protection.

Technical Specifications

• Subcategory: Cylindrical Locks
• Product Group: Mechanical Locks
• Series: CK4300 Series
• Grade: Grade 1
• Keyed Function: Non-Keyed
• Standard Latch: 787F65 - 2-3/4" Backset, Square corner front, 2-1/4" x 1-1/8" universal
• Standard Strike: ANSI Curved Lip 4-7/8" x 1-1/4" x 1-1/4" lip to center
• Warranty: 3 Year
• ANSI/BHMA: F75
• Product Subgroup: Bored Locksets
• Product Type: Knobsets
• Keyed: No
• Fasteners: Wood and Machine Screws
• Commercial/Residential: Commercial
• Function Description: Latchbolt by knob either side. Both knobs always free.
• Lock Type: Cylindrical
• Handle Type: Knob
• Lock Function: Passage
• Product Attribute: Cylindrical Locks
• Product Model: CK4310
• Product Function: Passage/Hall/Closet
• Door Hand Direction: Non-Handed
• Door Thickness Range: 1-3/8" to 2"
• Product Category: Mechanical Locks
• Backset (Distance): 2-3/4"
• Department: Door Hardware

Professional Applications

• Schools and Educational Facilities
• Hotels and Hospitality Properties
• Apartments and Multi-Tenant Residential Buildings
• Hospitals and Nursing Homes
• Churches and Houses of Worship
• Municipal and Government Buildings
• Airports and Transportation Facilities
• Retail Complexes and Commercial Offices
• Industrial and Warehouse Facilities

Why Choose Corbin Russwin Quality?

Corbin Russwin CK4300 Series cylindrical knobsets are purpose-built for the most demanding commercial, industrial, and institutional environments, featuring heavy wrought knobs with steel liners for impact resistance and zinc dichromate-plated internal components for lasting corrosion resistance. The 1/2" (13mm) stainless steel throw latchbolt and ANSI/BHMA F75 Grade 1 certification confirm this product meets the highest benchmarks for commercial door hardware performance. Backed by a 3-year manufacturer warranty, the Corbin Russwin CK4310 delivers the dependable, long-term reliability that high-traffic facilities require.