Name: Corbin Russwin CK4851 Grade 2 Entrance/Office Cylindrical Lock, Global Knob, Conventional Cylinder
Brand: Corbin Russwin
SKU: CK4851 GWC 626
Price: 265.09 USD
Availability: InStock

Product Overview
FAQs

Corbin Russwin CK4851-KEYED Grade 1 Entrance/Office Cylindrical Knobset with Global Knob and Conventional Cylinder

Commercial-Grade Bored Lockset for Entrance and Office Security

The Corbin Russwin CK4851-KEYED is a Grade 1 cylindrical knobset from the 4000 Series, engineered to deliver an outstanding combination of value and performance for quality residential and light commercial applications. Featuring a Global Knob design with a conventional cylinder, this entrance/office function lock accommodates door thicknesses from 1-3/8" to 2" and is non-handed for simplified installation. The standard latch is a 787F66 deadlocking latchbolt with a 2-3/4" backset, square corner front, and 2-1/4" x 1-1/8" universal faceplate, paired with an ANSI curved lip strike measuring 4-7/8" x 1-1/4" x 1-1/4" lip to center. Precision manufactured mechanisms are zinc dichromated for corrosion resistance, and the stainless steel latchbolt ensures long service life.

Professional Features & Benefits

Door Thickness Compatibility: Accommodates door thicknesses from 1-3/8" to 2", making it suitable for a wide range of residential and light commercial door applications.
Standard Latch Specifications: Includes a 787F66 deadlocking latchbolt with a 2-3/4" backset, square corner front, and 2-1/4" x 1-1/8" universal faceplate for versatile installation.
Standard Strike Specifications: Ships with an ANSI curved lip strike measuring 4-7/8" x 1-1/4" x 1-1/4" lip to center for a complete, ready-to-install package.
Adjustable Latchbolt: Accommodates both flat and beveled doors, providing installation flexibility across varied door configurations.
Corrosion-Resistant Construction: Precision manufactured mechanisms are zinc dichromated for corrosion resistance, while the stainless steel latchbolt delivers long-term durability.
Entrance/Office Function: Deadlocking latchbolt operated by knob from either side, except when the turn button locks the outside knob. Pushing the turn button locks the outside knob, requiring use of a key outside to unlock — ideal for controlled-access office and entrance applications.
Non-Handed Design: Universal, non-handed configuration simplifies ordering and installation without the need to specify door handing.
ANSI/BHMA Compliance: Meets ANSI/BHMA A156.2 standards, confirming Grade 1 performance for commercial applications.
Manufacturer Warranty: Backed by a 1 Year manufacturer warranty for added confidence and protection.

Technical Specifications

Subcategory: Cylindrical Locks
Product Group: Mechanical Locks
Series: 4000 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: 1 Year
ANSI/BHMA: A156.2
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: CK4851
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

Professional Applications

Commercial Office Buildings and Private Offices
Fine Homes and Upscale Residential Properties
Apartment and Multi-Unit Residential Buildings
Motel and Hospitality Facilities
Retail Establishments and Storefronts
Light Commercial and Mixed-Use Buildings
Educational and Administrative Facilities

Why Choose Corbin Russwin Quality?

Corbin Russwin cylindrical lock products deliver professional-grade reliability through precision manufactured mechanisms that are zinc dichromated for corrosion resistance and paired with a stainless steel latchbolt for long service life. The CK4851-KEYED meets ANSI/BHMA A156.2 Grade 1 standards, confirming its suitability for demanding commercial entrance and office applications. Backed by a 1 Year manufacturer warranty, this 4000 Series knobset is engineered to provide dependable access control performance across a wide range of commercial and quality residential installations.

Manufacturer Resources

Corbin Russwin Condensed Catalog

Product Specs

Subcategory:: Cylindrical Locks
Product Group:: Mechanical Locks
Series:: 4000 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:: 1 Year
ANSI/BHMA:: A156.2
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:: CK4851
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

Corbin Russwin CK4851 GWC 626 – Frequently Asked Questions

1) Will the Corbin Russwin CK4851 knob lock fit a 2 inch thick door?

Yes. The CK4851 entrance/office knobset covers door thicknesses from 1-3/8 inches up to 2 inches, so it handles standard 1-3/4 inch commercial doors and thicker solid-core or historic doors that many knobsets top out below. Most competing knob locks stop at 1-3/4 inches, so if you have a 2 inch leaf this is one of the few bored locks that will still work.

2) Do I need to specify handing when ordering the Corbin Russwin CK4851?

No handing to specify. The CK4851 is non-handed, so the same lock works on a left or right hand door, and the latchbolt adjusts for flat or beveled door edges. For a property manager buying a dozen at once, that means one part number covers every opening regardless of swing.

3) Will the CK4851 knobset latch into my existing strike, or do I have to re-mortise the frame?

The CK4851 uses a 2-3/4 inch backset deadlocking latch (the 787F66) with a square corner front and a 2-1/4 x 1-1/8 inch universal faceplate. It ships with an ANSI curved lip strike, 4-7/8 x 1-1/4 inches with 1-1/4 inch lip to center. If your frame already has an ANSI 4-7/8 inch strike prep, which is the standard on commercial hollow metal frames, the supplied strike drops straight in. If your existing door is bored at a 2-3/8 inch backset, this lock will not line up.

4) How does the entrance/office function on the Corbin Russwin CK4851 actually work day to day?

Knob turns from either side to retract the deadlocking latchbolt. Push the turn button on the inside knob and the outside knob locks; from then on it takes a key outside to get in. That is the classic office lock behavior, staff can secure the room on the way out without carrying a key for normal use. It is single cylinder, so there is one keyed side only.

5) What is the difference between the standard cylinder and the LC option on the Corbin Russwin CK4851?

Two choices. The standard build comes with a conventional 6-pin cylinder in the L4 keyway, keyed and ready to hang. LC means less conventional cylinder, the lock ships without one so a locksmith can fit a cylinder from an existing keying system. Pick LC only if you already have cylinders or a master key system to match; otherwise take the standard 6-pin.

6) Is a knob lock like the CK4851 acceptable for an ADA opening, or should I use a lever?

Use a lever on any opening that has to meet accessible-route hardware requirements. A round knob requires tight grasping and twisting of the wrist, which is exactly what accessible hardware rules prohibit, so a knobset like the CK4851 belongs on doors outside the accessible path, mechanical and storage rooms, or residential and hospitality unit doors. If the opening is on the accessible route, order a lever-handle cylindrical lock in the same function instead.

7) What is the closest keyed entrance/office knob equivalent to the Corbin Russwin CK4851 from another brand?

The Dexter C2000 Series entry/office cylindrical ball knob lock is the nearest match in function - it is a keyed entrance/office cylindrical knob lock, Grade 2, for doors 1-3/8 inch to 1-3/4 inch. The CK4851 is a keyed entrance/office cylindrical knobset carrying a Grade 1 rating and covering a wider 1-3/8 inch to 2 inch door thickness range, so on a thicker door above 1-3/4 inch the Corbin Russwin is the one that fits.

8) Which knob lock should be used instead of the CK4851 on a door that must stay locked at all times from the outside?

Entrance/office function is not the right pick there - on the CK4851 the outside knob is locked by a turn button inside, so anyone in the room can leave it unlocked. For an opening that must stay 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 CK4851 2-3/4 inch backset so the existing door prep carries over.

9) Can a passage knob be used in place of the Corbin Russwin CK4851?

No - a passage knob has no cylinder and no locking. The Falcon W101 is a Grade 2 medium duty passage/closet knob lock with a 2-3/4 inch backset, and the Schlage D10S is a Grade 1 heavy duty passage latch with an orbit knob; both share the CK4851 2-3/4 inch backset door prep but neither takes a key. The CK4851 is keyed with a single cylinder, so on an office door that needs to be secured after hours the passage versions will not do the job.

10) Is a residential entry knob such as the Kwikset 400P the same thing as the Corbin Russwin CK4851?

They are different classes of product. The Kwikset 400P-CP Polo keyed entry knob is Grade 3 for doors 1-3/8 inch to 1-3/4 inch and ships with a round corner adjustable latch and round corner strike. The CK4851 is a Grade 1 commercial knobset with a 2-3/4 inch backset square corner front latch and an ANSI curved lip strike, so it drops into standard commercial ANSI strike prep rather than residential round corner prep.

11) Can I get several Corbin Russwin CK4851 locks keyed alike so one key opens them all?

Yes. Keying is a required selection on the CK4851: keyed different is the standard, and keyed alike is available when you want one key to run multiple doors, for example a suite of offices or a set of apartment common doors. There is also a free-text field for special cylinder or keying requirements, which is where you note an existing keyway or master key system to be matched.

12) Is the Corbin Russwin CK4851 heavy duty enough for an office door that gets used all day?

The CK4851 is built to ANSI/BHMA A156.2 and carries a Grade 1 rating, which is the top commercial tier of that standard and the one specified for high-traffic openings. Mechanisms are zinc dichromated against corrosion and the latchbolt is stainless steel. For an office suite, retail back-of-house, or apartment entry door it is rated for the duty.

13) What else do I need to order to install a Corbin Russwin CK4851 knobset?

Nothing beyond the lock itself for a normal install. The CK4851 ships with its latch, its ANSI strike, and both wood and machine screws, so it covers a wood door or a hollow metal frame out of the box. What you do need is a door already bored for a standard cylindrical lock at a 2-3/4 inch backset. If the door is unbored, plan on a 2-1/8 inch cross-bore installation kit or a boring jig.

14) What other Grade 1 keyed knob locks could I use instead of the Corbin Russwin CK4851?

Two Grade 1 keyed knob alternatives worth looking at. The BEST 8K Series entrance function single cylinder knob lock is heavy duty and the closest match on function. The Sargent 8XG04 is Grade 1 heavy duty with a 2-3/4 inch backset, but it is a storeroom function, meaning the outside knob stays locked at all times and there is no turn button, so it is a different behavior rather than a straight swap. If you specifically need the turn-button office behavior, the BEST 8K is the closer equivalent.

15) Can I use a cheaper entrance knob lock instead of the Corbin Russwin CK4851 on apartment interior doors?

For lower-traffic or residential-grade openings there are Grade 3 entrance/office knob locks that do the same job at lower duty. The Cal-Royal BER00 is a Grade 3 entrance/office knob lock with a Kwikset keyway, and the Pamex FTF Baron is a Grade 3 entrance/office knobset. Both fit 1-3/8 to 1-3/4 inch doors only, so if your leaf is thicker than 1-3/4 inches the CK4851 is what you need. And on a corridor or unit entry door that a building code or spec calls Grade 1, a Grade 3 lock will not satisfy it.

16) I need a lock for a bathroom or a closet door, is the CK4851 the right one?

No. The CK4851 is a keyed entrance/office lock, which is more hardware than either of those doors needs. For a bathroom or bedroom use a privacy function knob, such as the Dexter C2000 Grade 2 privacy knob or the Pamex FTF Baron Grade 3 privacy knobset. For a closet or hall door that just needs to latch, a passage function like the Dexter C2000 Grade 2 passage knob or the Falcon W101 Grade 2 passage knob is the right part.

17) Can I put a Corbin Russwin CK4851 on a classroom door where the outside knob must never unlock from inside?

Not with the CK4851. Its turn button lets anyone inside lock the outside knob, which is the opposite of what a classroom or storeroom opening usually calls for. For a door that stays locked outside at all times, look at a storeroom function knob lock such as the Sargent 8XG04 in Grade 1 or the Sargent 6G04 in Grade 2. For a true classroom function, the Dexter C2000 classroom knob lock is a Grade 2 keyed option.

18) Is there a lighter duty keyed office knob lock than the Corbin Russwin CK4851 for a low traffic interior door?

Two keyed entrance/office knob locks sit at Grade 3: the Cal-Royal BER00, which uses a Kwikset keyway and fits doors 1-3/8 inch to 1-3/4 inch, and the Pamex FTF Baron in entrance/office function, also for 1-3/8 inch to 1-3/4 inch doors. Both deliver the same key-outside, turn-button-inside office pattern as the CK4851, which is rated Grade 1 to ANSI/BHMA A156.2 for heavier commercial traffic.

19) What knob lock matches the Grade 1 level of the CK4851 but for a classroom or restricted-key application?

For Grade 1 openings that need a different function, the BEST 8K Series entrance knob lock is Grade 1 heavy duty in entrance function, and the Falcon X101 is a Grade 1 heavy duty cylindrical passage knobset built around an interchangeable core for doors 1-3/8 inch to 2-1/4 inch. The CK4851 is a Grade 1 entrance/office knobset built around a conventional cylinder in the L4 keyway, so a facility standardizing on interchangeable cores would look at the X101 side.

20) What is the difference between the CK4851 and a dummy knob like the Schlage A170 or BEST 6K single dummy trim?

The Schlage A170 is a Grade 2 non-keyed single dummy trim for doors 1-3/8 inch to 1-7/8 inch, and the BEST 6K single dummy trim is a Grade 2 medium duty non-keyed dummy. Dummy trim is surface mounted knob trim with no latch and no cylinder, used on inactive leaves and closet fronts. The CK4851 is a keyed cylindrical lock that ships with a 787F66 deadlocking latchbolt and an ANSI curved lip strike, so it operates and secures the door.

21) What should be ordered instead of the CK4851 for a bathroom or bedroom door in the same building?

Privacy function is the counterpart for those doors. The Pamex FTF Baron privacy knob lockset is Grade 3 for doors 1-3/8 inch to 1-3/4 inch, the Dexter C2000 privacy ball knob is Grade 2 for the same 1-3/8 inch to 1-3/4 inch range, and the Cal-Royal BER20 is a Grade 3 privacy knob with brass trim. The CK4851 is an entrance/office function requiring a key outside to unlock, which is not what a bath or bedroom door calls for.

22) If a door needs keyless code entry instead of a keyed office lock, what replaces the CK4851?

The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function, fitting doors 1 3/16 inch to 2 inch. It is operated by a code rather than a cylinder, so there are no keys to issue or rekey. The CK4851 uses a conventional cylinder in the L4 keyway and can be ordered keyed alike across multiple locks when a facility wants one key to serve a group of doors.

23) What is the difference between the CK4851 and the Sargent 6G04 for an office suite?

The Sargent 6G04 is a Grade 2 standard duty storeroom/closet knob lock with a single cylinder from the 6 Line Series - the outside knob stays locked and a key retracts the latch every time. The CK4851 is Grade 1 with a single cylinder in entrance/office function, where the inside turn button decides whether the outside knob is free, letting staff leave the suite unlocked during business hours and secure it on the way out.

24) What knob lock suits a classroom door where the CK4851 entrance/office function is not permitted?

The Dexter C2000 Series classroom cylindrical ball knob lock is a Grade 2 keyed classroom function knob for doors 1-3/8 inch to 1-3/4 inch, where the outside knob is locked and unlocked by key only and cannot be secured from inside the room. The CK4851 is entrance/office function, whose inside turn button locks the outside knob, which is why it is specified for offices rather than classrooms.

25) What finishes does the Corbin Russwin CK4851 knob lock come in?

Three finishes across the range: 605 bright brass, 613 satin bronze oil-rubbed, and 626 satin chrome. Each is offered with either the standard 6-pin conventional cylinder or the LC less-cylinder build. For matching a building already standardized on satin chrome hardware, 626 is the usual commercial choice.

How fast can I get the Corbin Russwin CK4851 GWC 626 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 CK4851 GWC 626 come with a warranty?

Absolutely. The Corbin Russwin CK4851 GWC 626 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 CK4851 GWC 626?

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

Why buy the Corbin Russwin CK4851 GWC 626 from ZenSupply?

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Corbin Russwin CK4851 Grade 2 Entrance/Office Cylindrical Lock, Global Knob, Conventional Cylinder

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