Corbin Russwin CK4320 Privacy Cylindrical Lock - Grade 1, Global Knob, Non-Keyed

Corbin Russwin CK4320-NONKEYED Privacy Cylindrical Knobset - Grade 1, Global Knob, Non-Handed, 2-3/4" Backset

Commercial-Grade Privacy Lock for High-Use Institutional and Commercial Applications

The Corbin Russwin CK4320-NONKEYED is a Grade 1 privacy cylindrical knobset from the CK4300 Series, engineered for demanding commercial, industrial, and institutional environments. This non-keyed privacy function lock operates with a latchbolt by knob from either side, with the outside knob lockable via push button and unlockable by coin-turn emergency slot, rotating inside knob, or by closing the door — while the inside knob remains always free. Designed for door thicknesses of 1-3/8" to 2" with a 2-3/4" backset, the CK4320 delivers reliable privacy security across a wide range of commercial door applications. Heavy wrought knobs with a steel liner provide exceptional impact resistance, and internal parts 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 configurations.
• Precise 2-3/4" Backset: Standard 2-3/4" backset with a 787F65 latch featuring a square corner front and 2-1/4" x 1-1/8" universal sizing for reliable, consistent installation.
• Heavy-Duty Impact-Resistant Construction: Heavy wrought knobs are lined with steel for superior impact resistance, making the CK4320 ideal for high-traffic and high-use environments.
• Corrosion-Resistant Internal Components: Internal parts are zinc dichromate plated to resist corrosion, extending service life in demanding institutional and commercial settings.
• 1/2" (13mm) Stainless Steel Latchbolt: Robust stainless steel throw latchbolt provides dependable latching performance and long-term durability.
• Privacy Function Operation: Outside knob locks via push button; unlocks by coin-turn in emergency slot outside, by rotating inside knob, or by closing the door. Inside knob always remains free for safe egress.
• Non-Handed Design: Non-handed configuration simplifies ordering and installation, eliminating the need to specify door handing.
• ANSI Curved Lip Strike Included: Comes with an ANSI curved lip strike measuring 4-7/8" x 1-1/4" x 1-1/4" lip to center for a complete, code-compliant installation.
• Manufacturer Warranty: Backed by a 3-year warranty for added confidence and long-term protection in commercial applications.

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: F76A
• Product Subgroup: Bored Locksets
• Product Type: Knobsets
• Keyed: No
• Fasteners: Wood and Machine Screws
• Commercial/Residential: Commercial
• Function Description: Latchbolt by knob either side. Outside knob locked by push button. Outside knob unlocked by coin turned in emergency slot outside, by rotating inside knob or by closing door. Inside knob always free.
• Lock Type: Cylindrical
• Handle Type: Knob
• Lock Function: Privacy/Bed/Bath
• Product Attribute: Cylindrical Locks
• Product Model: CK4320
• Product Function: Privacy/Bed/Bath
• 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 locks are built to Grade 1 commercial standards, featuring heavy wrought knobs with steel liners for impact resistance and zinc dichromate plated internal components for corrosion resistance. The 1/2" (13mm) stainless steel throw latchbolt ensures dependable latching performance across millions of operations in the most demanding commercial environments. Backed by a 3-year manufacturer warranty, Corbin Russwin delivers the professional-grade reliability that commercial, institutional, and industrial facilities require.