Corbin Russwin CK4310 Passage/...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$987.77
$577.09
Corbin Russwin Corbin Russwin CK4310 Passage/Closet Cylindrical Lock - Grade 1, Global Knob, Non-Keyed COR-CK4310-NONKEYED

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

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Model: CK4310 GRD 630
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$987.77
$577.09
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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.

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:
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

Corbin Russwin CK4310 GRD 630 – Frequently Asked Questions

1) Will the Corbin Russwin CK4310 passage knob fit a 2 inch thick door?
Yes. The CK4310 covers door thicknesses from 1-3/8 to 2 inches out of the box, which is wider than most cylindrical knobsets go. That range takes it from an older 1-3/8 inch interior door right through 1-3/4 inch commercial doors and up to 2 inch thick slabs. Backset is 2-3/4 inches, the standard commercial backset, so it drops into a door already bored for commercial hardware.
2) Does the CK4310 knobset lock at all, or is it just a latch?
No locking of any kind. The CK4310 is a passage function: latchbolt retracts by knob from either side and both knobs are always free. There is no key, no cylinder, and no thumbturn or push button. Use it on corridor, hall, and closet doors where the door only needs to stay shut. If you need the room to lock from inside, you want a privacy function; if it needs to lock with a key, you want an entrance or storeroom lock instead.
3) Will the CK4310 latch into the strike already in my frame?
Depends on what is in the frame now. The CK4310 ships with a 787F65 latch on a 2-3/4 inch backset with a square corner front, 2-1/4 x 1-1/8 inches, and an ANSI curved lip strike measuring 4-7/8 x 1-1/4 inches with 1-1/4 inch lip to center. If your frame is already prepped for an ANSI 4-7/8 inch strike, which is the normal commercial frame prep, the included strike drops straight in. If the existing frame has a small round corner or full lip residential strike, the new strike will not cover the old cutout and you will be patching the jamb.
4) Is a Grade 1 knobset worth it for a school corridor, or will a Grade 2 passage lock do?
For a school corridor or any opening that gets cycled hard all day, Grade 1 is the tier you want, and the CK4310 carries ANSI/BHMA F75 Grade 1. Grade 1 is the top of the three ANSI/BHMA commercial tiers for cycle count and strength. Grade 2 passage knobs like the Arrow MK01 or the Dexter C2000 passage knob are built for lighter interior duty, and they cap out at 1-3/4 inch doors where the CK4310 goes to 2 inches. On a closet or a low traffic office door, a Grade 2 is defensible; on a corridor with a thousand cycles a week it is a false economy.
5) What is the closest Grade 1 passage knob equivalent to the Corbin Russwin CK4310 from another manufacturer?
The Schlage D10S is the nearest match. Like the CK4310, it is a Grade 1 non-keyed cylindrical passage knob lock in the Schlage D Series, rated heavy duty. Both retract the latchbolt by knob from either side with both knobs always free. If a spec calls for a Grade 1 cylindrical passage knobset and the Corbin Russwin CK4300 Series is not the standard on the building, the D10S covers the same function at the same grade. The Falcon X101 is a second Grade 1 heavy duty cylindrical passage knobset, in the X Series, and it accepts an interchangeable core.
6) Is there a lighter-duty passage knob that will work where Grade 1 is not required?
Yes. For interior passage openings that do not carry a Grade 1 requirement, the Falcon W101 is a Grade 2 cylindrical knob lock with passage/closet latch function and the same 2-3/4 inch backset the CK4310 uses, and it carries a fire rating. The Arrow MK01 and Arrow RK01 are also Grade 2 non-keyed passage cylindrical knob locks, the RK01 with a ball knob. The Dexter C2000 passage knob is Grade 2 as well. The trade-off is door thickness: the CK4310 covers 1-3/8 inch through 2 inch, while the Arrow and Dexter units are rated 1-3/8 inch to 1-3/4 inch, so a 2 inch door rules them out.
7) The door is thicker than 2 inches. What passage knob covers it?
The Falcon X101 is the option in that range. It is a Grade 1 heavy duty cylindrical passage knobset rated for door thicknesses from 1-3/8 inch to 2-1/4 inch, where the Corbin Russwin CK4310 tops out at 2 inch. Both are Grade 1 passage function, so the X101 holds the grade while covering the thicker leaf.
8) The room needs to lock. What do I order instead of a passage knobset?
A passage function is non-keyed and never secures the opening - the CK4310 keeps both knobs always free. For a room that has to be secured, the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet knob lock with a single cylinder and a 2-3/4 inch backset, matching the CK4310 backset. The BEST 8K Series entrance function single cylinder knob lock is also Grade 1 heavy duty. At Grade 2, the Sargent 6G04 is a storeroom/closet knob lock with single cylinder. For a bathroom or bedroom that needs privacy rather than keying, the Dexter C2000 privacy knob is a Grade 2 non-keyed privacy function.
9) Can a dummy knob be substituted for the Corbin Russwin CK4310?
No. A dummy trim is a fixed knob with no latch mechanism at all - it does not retract anything and the door must be held by a catch or a magnet. The CK4310 is a working passage latchset that retracts a 787F65 latch, 2-3/4 inch backset, by knob from either side. Products such as the Schlage A170 single dummy trim, the BEST 6K Series single dummy trim, and the Cal-Royal BA40 dummy knob are dummy function and will not latch a door. Order dummy trim only for an inactive leaf or a closet door already held closed by other means.
10) Do I have to specify handing when ordering a Corbin Russwin CK4310?
No handing to specify. The CK4310 is non-handed, so one part number covers left and right hand openings, inswing and outswing. For a property manager or MRO buyer stocking spares that means a single line item on the shelf instead of two, and no wrong-hand returns from the field.
11) Do I need to order anything else to install a CK4310 knobset?
No. The latch and the strike both come with it, along with wood and machine screws, so between the 787F65 latch, the ANSI curved lip strike, and the fasteners you have a complete opening in one box. The only thing to confirm before the truck rolls is that the door is bored on a 2-3/4 inch backset.
12) I need a matching non-functioning knob for a closet or an inactive leaf. Is the CK4310 the right part?
No, the CK4310 is a working passage set with a live latchbolt. For an inactive leaf or a false door that just needs a knob to pull on, you want a dummy trim instead: the Schlage A170 single dummy is a Grade 2 cylindrical non-keyed knob, and the BEST 6K Series single dummy is another Grade 2 option. Both mount without a latch. Use the CK4310 only where the door actually has to latch closed.
13) Can I standardize a whole facility on the CK4300 Series if some doors need to lock?
Yes, that is how the series is meant to be used. The CK4310 is the passage function within the CK4300 Series of Grade 1 cylindrical knobsets, so the corridor and closet doors take the CK4310 while the doors needing key control take a keyed function in the same series. Trim style, finish, backset, and installation prep stay common across the openings, which is what keeps a facility's spare parts down to one shelf.
14) Will a residential passage knob work in place of the CK4310 on an apartment interior door?
It depends on the traffic the opening sees. The CK4310 is a commercial ANSI/BHMA F75 Grade 1 knobset built for high-use openings. The Kwikset 200P Polo passage knob ships with a 6AL latch and RCS round corner strike, and the Kwikset 200P-CP uses a round corner adjustable latch with round corner strike - a different strike prep than the ANSI curved lip 4-7/8 inch strike the CK4310 includes, so swapping one for the other in an existing door usually means changing the strike and the frame prep. The Pamex FTF passage knob is a Grade 3 passage lockset for 1-3/8 inch to 1-3/4 inch doors. Where a facility standard calls for Grade 1, keep the CK4310.
15) What is the difference between the CK4310 and a decorative brass passage knob like the Baldwin 5011 or Omnia 434/PA?
Function is the same on paper - all three are passage/hall/closet knobs - but they are built for different openings. The CK4310 is a commercial Grade 1 knobset with a 2-3/4 inch backset and an ANSI curved lip strike. The Baldwin Estate 5011 Colonial passage knob uses a 5058 rose, and the Baldwin Estate 5000 Baltimore passage lock is preconfigured with a 2-3/8 inch backset and a full lip strike, which is a different bore-to-edge dimension and a different strike prep from the CK4310. The Omnia 434/PA is a solid brass egg-shaped knob latchset with a 3 inch projection. Choose the decorative units where appearance drives the selection and the opening is not carrying commercial traffic.
16) Which passage knob should I use if I need an interchangeable core or a keyed opening later in the same series?
The Falcon X101 is a Grade 1 heavy duty cylindrical passage knobset built to take an interchangeable core, which suits a facility standardizing on a core system across mixed functions. The CK4310 is a non-keyed passage function, so it carries no cylinder at all. If the same door may later need to be keyed, the BEST 8K Series entrance function single cylinder knob lock is Grade 1 heavy duty, and the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet knob with a 2-3/4 inch backset, the same backset as the CK4310.
17) Is a keyless combination knob lock an alternative to the CK4310 for a closet or storage room?
Only if the room needs controlled access. The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function, fitting doors from 1 3/16 inch to 2 inch. It requires a code to enter, where the CK4310 is a true non-keyed passage knob with both knobs always free and no restriction on entry. For a hall or closet door that simply needs to latch, the CK4310 is the direct answer; for a supply room where a code should govern entry, the 3830 is the different tool.
18) Does the CK4310 come as a classroom function, and what do I use for a classroom door?
No, the CK4310 is passage function only - non-keyed, latchbolt by knob from either side. For a classroom opening the Dexter C2000 classroom cylindrical ball knob lock is a Grade 2 keyed classroom function for 1-3/8 inch to 1-3/4 inch doors. The Sargent 28C-KNOB is classroom function knob and rose trim for an exit device on 1-3/4 inch doors, which is the right part only where the door already carries an exit device rather than a bored lock.
19) What finishes does the Corbin Russwin CK4310 come in?
Three finishes: 605 bright brass, 613 satin bronze oil-rubbed, and 630 satin stainless steel. For most commercial and institutional work 630 is the one to match, since satin stainless is what the bulk of existing commercial door hardware is specified in. Go to 605 or 613 when you are matching a hospitality or older brass-trimmed opening.
20) Is the CK4310 a commercial lock or will it work on a house?
It is built and rated as commercial hardware, Grade 1, and it is heavier and more expensive than a home needs. Physically it will mount on a residential door if that door is bored 2-3/4 inch backset and falls in the 1-3/8 to 2 inch thickness range, but most residential doors are bored 2-3/8 inch, and the CK4310 is fixed at 2-3/4. For a house, a residential passage knob with an adjustable backset such as the Kwikset 200P-CP, which ships with a round corner adjustable latch, is the correct part.
How fast can I get the Corbin Russwin CK4310 GRD 630 delivered?
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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 CK4310 GRD 630 come with a warranty?
Absolutely. The Corbin Russwin CK4310 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 CK4310 GRD 630?
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