Corbin Russwin CK4351 Entrance/Office Cylindrical Lock - Grade 1, Global Knob, Keyed

Corbin Russwin CK4351-KEYED Entrance/Office Cylindrical Knobset - Grade 1, Global Knob, Keyed, 1-3/8" to 2" Doors

Heavy-Duty Commercial Cylindrical Lock for High-Use Institutional and Commercial Applications

The Corbin Russwin CK4351-KEYED Entrance/Office Cylindrical Knobset is a Grade 1 commercial-grade bored lockset engineered for demanding, high-use environments including schools, hospitals, hotels, and municipal buildings. Designed for doors ranging from 1-3/8" to 2" in thickness with a standard 2-3/4" backset, this knobset features a conventional 6-pin cylinder and ships with two nickel silver keys. The CK4300 Series delivers exceptional impact resistance through heavy wrought knobs lined with steel, while internal parts are zinc dichromate plated for corrosion resistance, making it a reliable choice for commercial, industrial, and institutional applications.

Professional Features & Benefits

• Door Thickness Compatibility: Designed for 1-3/8" to 2" doors with a 2-3/4" backset, accommodating a wide range of standard commercial door preparations.
• Grade 1 Commercial Performance: ANSI/BHMA Grade 1 rated (F109) for the most demanding commercial, industrial, and institutional applications where durability and reliability are critical.
• Heavy-Duty Knob Construction: Heavy wrought knobs with steel liner provide exceptional impact resistance for high-traffic environments such as schools, hospitals, and airports.
• Corrosion-Resistant Internal Components: Internal parts are zinc dichromate plated for corrosion resistance, extending service life in demanding conditions.
• Deadlocking Latchbolt: Features a 1/2" (13mm) stainless steel throw deadlocking latchbolt operable by knob from either side, with a turn button that locks the outside knob requiring key entry to unlock.
• Entrance/Office Function: Pushing the turn button locks the outside knob requiring key use; turning the inside knob unlocks the outside knob. A push-and-turn button position requires key at all times until manually returned to unlocked position, while the inside knob remains always free.
• Standard Latch Included: Ships with a 787F66 deadlocking latch with 2-3/4" backset, square corner front, 2-1/4" x 1-1/8" universal configuration.
• ANSI Curved Lip Strike Included: Includes an ANSI curved lip strike measuring 4-7/8" x 1-1/4" x 1-1/4" lip to center for standard door frame compatibility.
• Conventional 6-Pin Cylinder: Equipped with a conventional 6-pin cylinder and two nickel silver keys for reliable keyed security.
• Non-Handed Design: Non-handed configuration simplifies installation and reduces inventory requirements for commercial projects.
• Manufacturer Warranty: Backed by a 3-year warranty for added confidence and protection.

Technical Specifications

• Subcategory: Cylindrical Locks
• Product Group: Mechanical Locks
• Series: CK4300 Series
• Grade: Grade 1
• Keyed Function: Single Cylinder
• Standard Latch: 787F66 - Deadlocking 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: F109
• Product Subgroup: Bored Locksets
• Product Type: Knobsets
• Keyed: Yes
• Fasteners: Wood and Machine Screws
• Commercial/Residential: Commercial
• Function Description: Deadlocking latchbolt by knob either side, except when turn button locks outside knob. Pushing turn button in locks outside knob, requiring use of key outside to unlock.
• Lock Type: Cylindrical
• Handle Type: Knob
• Lock Function: Entrance/Office
• Product Attribute: Cylindrical Locks
• Product Model: CK4351
• Product Function: Entrance/Office
• 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

Installation & Operation

1. Review manufacturer specifications and verify door preparation requirements including door thickness (1-3/8" to 2"), backset (2-3/4"), stile width, and handing as applicable to this product.
2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions. Install fasteners using the included wood and machine screws as appropriate for the door material.
4. Install the 787F66 deadlocking latch with 2-3/4" backset and secure the device to the door per manufacturer torque specifications.
5. Install the ANSI curved lip strike (4-7/8" x 1-1/4" x 1-1/4" lip to center) on the door frame, adjusting for proper latch engagement and alignment.
6. Test device operation to verify proper function of the turn button, inside knob, and keyed cylinder. Make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

• Schools and Educational Facilities
• Hospitals and Nursing Homes
• Hotels and Apartment Buildings
• 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 deliver professional-grade reliability with heavy wrought knobs lined with steel for impact resistance and zinc dichromate plated internal parts for corrosion resistance. The CK4351 meets ANSI/BHMA Grade 1 standards (F109) and is backed by a 3-year manufacturer warranty, providing confidence for the most demanding commercial and institutional applications. Engineered for high-use environments where dependable performance and long-term durability are essential.