Corbin Russwin CK4320 Privacy ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,107.89
$646.91
Corbin Russwin Corbin Russwin CK4320 Privacy Cylindrical Lock - Grade 1, Global Knob, Non-Keyed COR-CK4320-NONKEYED

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

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Model: CK4320 GRD 630
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$1,107.89
$646.91
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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.

Product Specs

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

Corbin Russwin CK4320 GRD 630 – Frequently Asked Questions

1) Do I have to specify handing when ordering a CK4320 knob lock?
No handing to specify. The CK4320 is non-handed, so one part number works on a left or right hand door and the latch installs either way. For a property manager stocking spares that means a single item covers every privacy opening in the building.
2) How does the CK4320 unlock from the outside if someone is locked in a bathroom?
Three ways. The outside knob locks with a push button, and it releases by turning a coin in the emergency slot on the outside knob, by rotating the inside knob, or simply by closing the door. The inside knob is always free, so nobody can be trapped and egress is never blocked. That is the standard bed and bath behavior facility staff expect on restrooms and patient rooms.
3) Will the CK4320 latch into the strike prep I already have in the frame?
It ships with an ANSI curved lip strike, 4-7/8 by 1-1/4 inches with a 1-1/4 inch lip to center, so it drops into a standard ANSI T strike cutout in a hollow metal frame. The latch is the 787F65, a 2-3/4 inch backset unit with a square corner front and a 2-1/4 by 1-1/8 inch universal face. If your existing prep is a round corner or a full lip residential strike, you will be patching or swapping the frame prep.
4) Is the Corbin Russwin CK4320 an ANSI Grade 1 lock, and what function code is it?
Grade 1, and the function is ANSI/BHMA F76A, the privacy bed and bath designation. That is the pairing a spec writer or MRO buyer looks for when the drawing calls out a Grade 1 cylindrical privacy set for restrooms, patient rooms, or dorms. Grade 1 is the heaviest of the three ANSI/BHMA operational grades, which is why it turns up in schools, hospitals, and airports rather than light commercial.
5) Which privacy knob will fit a 2 inch thick door?
The Corbin Russwin CK4320 privacy knob is rated for door thicknesses from 1-3/8 inch to 2 inch, so a 2 inch door is inside its range. Among the other privacy knobs, the Deltana 6112 St. Thomas privacy knob also carries a 1-3/8 inch to 2 inch range. The Grade 2 Dexter C2000 privacy knob and the Grade 3 Cal-Royal BER20 and Pamex FTF privacy locksets all top out at 1-3/4 inch, so they do not reach a 2 inch door.
6) What is the closest Grade 1 alternative to the Corbin Russwin CK4320 privacy knob if I need a keyed function on the same door instead?
The CK4320 is a non-keyed Grade 1 privacy knob lock, so it has no cylinder at all. If the opening needs a key, two Grade 1 knob locks cover it: the BEST 8K Series heavy duty knob lock in entrance function, and the Sargent 8XG04 storeroom/closet knob lock with a single cylinder and a 2-3/4 inch backset, which matches the 2-3/4 inch backset the CK4320 uses. Choose entrance function where the outside knob is meant to be locked and unlocked by the occupant, storeroom where the outside knob stays locked at all times and the key is the only outside entry.
7) Is the Dexter C2000 privacy knob a direct substitute for the Corbin Russwin CK4320?
They share the privacy/bed/bath function and both are non-keyed cylindrical ball or global knob locks, but they differ on two counts a spec writer cares about. The CK4320 is Grade 1 and fits doors from 1-3/8 inch to 2 inch. The Dexter C2000 privacy knob is Grade 2 and fits 1-3/8 inch to 1-3/4 inch, so on a 2 inch door it is out of range. Where the drawing calls for Grade 1, the Dexter does not meet it.
8) For a classroom door, is the Corbin Russwin CK4320 the right lock or do I need something else?
The CK4320 is a privacy/bed/bath function - the outside knob locks with a push button from inside and releases with a coin turn, which is not how a classroom door is controlled. Classroom function is keyed from the outside so staff set the condition: the Dexter C2000 Series Grade 2 classroom cylindrical ball knob lock is the classroom-function knob, fitting doors 1-3/8 inch to 1-3/4 inch. Where the classroom door carries an exit device instead, the Sargent 28C-KNOB exit device trim is supplied in classroom function for 1-3/4 inch doors.
9) Should I use a privacy knob or a passage knob on a restroom door?
A restroom or bedroom door wants privacy. The CK4320 gives you a lockable outside knob with a coin-turn release, which a passage set does not have at all: passage latches simply retract from either side with no locking. If the opening is a hall, closet, or corridor door where you only need it to stay shut, a passage function like the Schlage D10S is the correct part and costs you nothing in hardware you will not use. Go the other direction, to a keyed entrance or storeroom lock, when the room needs to be secured against the public.
10) Is a Grade 1 privacy knob overkill for an apartment bathroom, or is there a lighter option?
For a light-traffic unit bathroom a Grade 2 or Grade 3 privacy knob does the job: the Dexter C2000 Grade 2 privacy ball knob and the Cal-Royal BER20 Grade 3 privacy knob both cover 1-3/8 to 1-3/4 inch doors. The reason to pay for the CK4320 instead is traffic and abuse. Its knobs are heavy wrought with a steel liner and the internal parts are zinc dichromate plated, which is what holds up in dorms, hospitals, and public restrooms where the lighter grades get replaced on a cycle. Note the thickness difference too: the CK4320 goes to 2 inches, the Dexter and Cal-Royal stop at 1-3/4.
11) Does the CK4320 knobset come with everything needed to install it, or do I need to order a latch and strike separately?
It is a complete set. The 787F65 latch and the ANSI curved lip strike come with it, along with wood and machine screws, so it covers both a wood door and a hollow metal frame without a separate fastener pack. Nothing else is required on a door already bored to 2-3/4 inch backset.
12) I need one privacy knob to match dozens of existing doors across a building. Will the CK4320 standardize across them?
It is built for exactly that. One non-handed part number covers every swing, the 1-3/8 to 2 inch thickness range takes in both current 1-3/4 inch commercial doors and thicker older leaves, and the 2-3/4 inch backset with an ANSI strike prep is what most commercial frames are already cut for. Pick a single finish, 630 satin stainless being the usual institutional choice, and the same item covers restrooms across the whole facility.
13) Can I use a dummy knob in place of the Corbin Russwin CK4320 on an inactive leaf?
No - a dummy knob is surface trim with no latch and no locking, so it will not secure or latch anything. The CK4320 is a full cylindrical privacy lock with a latchbolt operated by knob from either side. For a genuinely inactive leaf or a pull-only door, the dummy options include the Schlage A170 single dummy trim and the BEST 6K Series single dummy trim, both Grade 2. Use a dummy only where nothing needs to latch.
14) I am standardizing a facility on Grade 1 knob hardware - which functions can I get to match the Corbin Russwin CK4320?
Building the set around Grade 1 knobs: the CK4320 covers privacy/bed/bath on doors 1-3/8 inch to 2 inch with a 2-3/4 inch backset. Passage is covered by the Schlage D10S Grade 1 passage latch with Orbit knob and the Falcon X101 Grade 1 heavy duty passage knobset with interchangeable core. Storeroom is covered by the Sargent 8XG04 Grade 1 storeroom/closet single cylinder knob lock with a 2-3/4 inch backset, and keyed entrance by the BEST 8K Series Grade 1 heavy duty knob lock. That gives privacy, passage, storeroom and entrance all at Grade 1.
15) What privacy knobs are there for a residential-style apartment door instead of the commercial Corbin Russwin CK4320?
The CK4320 is a commercial-duty Grade 1 privacy knob built for institutional traffic. Where the look matters more than commercial duty, the Deltana 6112 St. Thomas privacy knob covers the same privacy/bed/bath function and the same 1-3/8 inch to 2 inch door thickness range as the CK4320. The Baldwin Estate 5077 Bethpage privacy knob with R027 rose and the Baldwin Estate 5000 Baltimore privacy knob, which uses a 2-3/8 inch backset and a full lip strike, are decorative privacy knobs - note the 2-3/8 inch backset differs from the 2-3/4 inch backset the CK4320 takes, so the existing bore may not carry over.
16) Will a keyed entry knob work on a bathroom door in place of the Corbin Russwin CK4320?
It will latch, but it changes how the door behaves. The CK4320 privacy function keeps the inside knob always free and gives an outside coin-turn emergency slot so the room can be opened from the corridor without a key. Keyed entry knobs such as the Kwikset 400P-CP Polo keyed entry knob, which is Grade 3 and fits 1-3/8 inch to 1-3/4 inch doors, and the Master Lock BC Series Grade 3 biscuit knob keyed entry, require a key from outside instead of a coin turn. For bed and bath openings where a staff member may need to reach an occupant, the privacy function is the one written on most institutional specs.
17) What is the difference between the Corbin Russwin CK4320 and a knob-only exit device trim like the Sargent 78-2875?
They are not interchangeable. The CK4320 is a complete cylindrical lock with its own latchbolt, 787F65 latch and ANSI curved lip strike, bored into the door and standing on its own. The Sargent 78-2875 is an outside knob only with B design, and the Sargent 28C-KNOB is exit device trim with knob and rose - both are trim that mounts to an exit device and does the latching through that device. Order the trim only when an exit device is already on the door.
18) What finishes does the Corbin Russwin CK4320 privacy knobset come in?
Three: 605 bright brass, 613 satin bronze oil-rubbed, and 630 satin stainless steel. On institutional work 630 is the one that matches most existing commercial hardware; 605 and 613 are there when you are matching decorative trim already on the openings. Finish is the only choice to make on this lock, since it is non-handed and non-keyed.
19) Do I have to specify handing when cross-shopping the Corbin Russwin CK4320 against other knob locks?
Not for the CK4320 - it is non-handed, so one part number works on a left or right hand door and there is nothing to get wrong on the order. Its peers in the privacy function, including the Dexter C2000 Grade 2 privacy ball knob and the Cal-Royal BER20 Grade 3 privacy knob, are also knob locks rather than levers, which is the usual place handing enters a knob order. Confirm backset and door thickness instead, since those are where the substitutions actually diverge.
How fast can I get the Corbin Russwin CK4320 GRD 630 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Corbin Russwin CK4320 GRD 630 come with a warranty?
Absolutely. The Corbin Russwin CK4320 GRD 630 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Corbin Russwin CK4320 GRD 630?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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