Name: Corbin Russwin CL3555 Grade 2 Classroom Heavy-Duty Cylindrical Lever Lock
Brand: Corbin Russwin
SKU: CL3555 NZD 626
Price: 480.55 USD
Availability: InStock

Product Overview
FAQs

Corbin Russwin CL3555-KEYED Heavy-Duty Grade 1 Classroom Cylindrical Lever Lock with ANSI F84 Function

Commercial-Grade Classroom Security with Deadlocking Latchbolt Technology

The Corbin Russwin CL3555-KEYED is a heavy-duty Grade 1 cylindrical lever lock engineered for classroom and institutional security applications. Designed to meet ANSI function F84 (Classroom), this keyed cylindrical lever lock features a deadlocking latchbolt operable by lever from either side, except when the outside lever is locked by key — placing the lever handle in a freewheeling position for enhanced security. Compatible with doors ranging from 1-3/8" to 1-3/4" in thickness and featuring a 2-3/4" backset, the CL3555-KEYED is built from solid cast levers and a steel substrate with zinc dichromate treatment for corrosion resistance. The most common configuration features the NZD Newport lever in a 626 Satin Chrome finish.

Professional Features & Benefits

Grade 2 standard-duty lever lockset per ANSI/BHMA A156.2 Series 4000, Grade 2
Lever Release freewheeling levers for vandal resistance
Solid cast levers with no plastic inserts
Thrubolts prevent chassis rotation; ensure alignment, smooth operation and long life
Non-handed spring cassette prevents lever sag
1/2" throw latchbolt accommodates 7/8" and 1" edge bore preps
2-3/8", 2-3/4", 3-3/4" and 5" backsets available
UL/cUL listed for 3-hour fire doors up to 4' x 10'
14 finishes plus MicroShield® antimicrobial options
High Security and security key systems available (Access 3®, Pyramid)
Five-year limited warranty

Technical Specifications

Grade: ANSI/BHMA A156.2 Series 4000, Grade 2
Door Prep: ANSI/BHMA A156.115
Handing: Non-handed
Door Thickness: 1-3/8" to 1-7/8" (35–48mm) standard; optional 2" 2-1/4" (57mm)
Backset: 2-3/4" (70mm) standard; optional 2-3/8", 3-3/4", 5"
Latchbolt: Stainless steel, 1/2" (13mm) throw
Front: Wrought brass, bronze, or stainless steel, 2-1/4" x 1-1/8" (standard)
Strike: Wrought brass or stainless steel, ANSI curved lip, 4-7/8" x 1-1/4" x 1-1/4" lip to center
Cylinder: Brass, 6-pin L4 keyway, 0-bitted standard
Minimum Stile: 4-1/2" (114mm)
Certifications: ANSI/BHMA A156.2 Grade 2; UL/cUL 3-hour fire rating; ADA A117.1; NFPA 80; Windstorm/Hurricane certified
Warranty: Five-year limited

Professional Applications

K-12 Educational Facilities and Classrooms
College and University Campus Buildings
Commercial Office Buildings
Healthcare and Convalescent Care Facilities
Hotel and Hospitality Properties
Apartment and Multi-Family Residential Complexes
Retail and Restaurant Establishments

Why Choose Corbin Russwin Quality?

Corbin Russwin cylindrical lever locks are engineered to deliver heavy-duty, Grade 1 performance with solid cast levers, a through-bolted chassis, and a steel substrate with zinc dichromate treatment for corrosion resistance — built to withstand the rigors of high-traffic commercial and institutional environments. The CL3555-KEYED is backed by a 7 Year Limited warranty, providing long-term confidence in your investment. As part of the CL3500 Series, it complements the CL3300 Extra Heavy-Duty and CL3800 Standard-Duty families, enabling consistent aesthetics and reduced project costs across an entire facility.

Manufacturer Resources

Corbin Russwin Condensed Catalog

Product Specs

Subcategory:: Cylindrical Locks
Product Group:: Mechanical Locks
Series:: CL3500 Series
Grade:: Grade 1
Duty Level:: Heavy Duty
Keyed Function:: Single Cylinder
Standard Cylinder:: Conventional 6-pin Cylinder, L4 Keyway
Standard Latch:: Deadlatch - Square corner front, 2-1/4" x 1-1/8", 2-3/4" backset
Standard Strike:: ANSI Curved Lip 1-1/4" Lip Length
Warranty:: 7 Year Limited
ANSI/BHMA:: F84
Product Subgroup:: Bored Locksets
Product Type:: Leverset
Keyed:: Yes
Commercial/Residential:: Commercial
Function Description:: Deadlocking latchbolt by lever either side, except when key outside locks outside lever. (Lever handle is freewheeling in locked position). Outside lever unlocked by key outside. Inside lever always free.
Lock Type:: Cylindrical
Handle Type:: Lever
Lock Function:: Classroom
Product Attribute:: Cylindrical Locks
Product Model:: CL3555
Product Function:: Classroom
Door Hand Direction:: Non-Handed
Door Thickness Range:: 1-3/8" to 1-3/4"
Fire Rating:: Yes
Product Category:: Mechanical Locks
Product Substrate:: Steel, Zinc dichromated for corrosion resistance
Backset (Distance):: 2-3/4"
Department:: Door Hardware

Corbin Russwin CL3555 NZD 626 – Frequently Asked Questions

1) What does the classroom function on the CL3555 actually do when a teacher locks the door?

Key from the outside is the only way to lock or unlock the outside lever. Once locked, the outside lever freewheels (it turns but doesn't retract the latch), and the inside lever always retracts the latch, so nobody is ever trapped in the room. The latchbolt is deadlocking, so it can't be carded once the door is closed. That's ANSI F84. Note what it does not do: there is no inside cylinder or thumbturn, so a teacher has to step into the corridor with a key to secure the room. If you want to lock the outside lever from inside the classroom, you want a classroom security function instead, such as the Dexter C1000 Classroom Security lever.

2) Can I get the CL3555 to work on our existing Corbin Russwin small format interchangeable core key system?

Yes, order it less core. The cylinder choices are the conventional 6-pin cylinder in the L4 keyway (standard, 0-bitted), CL6 for a less-core 6-pin Corbin Russwin large format interchangeable core, CL7 for the less-core 7-pin LFIC, or LC to take the lock with no conventional cylinder at all if you are supplying your own. If your campus is already on Corbin Russwin LFIC, the CL6 or CL7 option lets your locksmith drop your existing cores straight in.

3) Can the CL3555 classroom lever go on a fire rated door?

It's fire rated, and the latchbolt deadlocks, which is what a labeled opening needs from a latch. Do keep the fire door assembly intact: use the ANSI curved lip strike supplied and don't add anything that would hold the latch back.

4) What is the closest cross-brand equivalent to a Corbin Russwin CL3555 classroom lever lock?

The Dexter C1000 Series classroom cylindrical lever lock is the nearest match. Both are keyed classroom-function cylindrical lever locks: the CL3555 carries a Grade 1 rating with a 1-3/8 inch to 1-3/4 inch door thickness range, and the Dexter C1000 classroom lock is also Grade 1 and covers the same 1-3/8 inch to 1-3/4 inch door range. The Dexter uses a clutching lever design, while the CL3555 uses a freewheeling Lever Release lever that goes free when the outside lever is locked by key.

5) What is the difference between a storeroom lever lock and the Corbin Russwin CL3555 classroom lock?

A storeroom lock keeps the outside lever locked at all times and the key only retracts the latch; the Cal-Royal AG05 is a Grade 2 storeroom lever lockset with a deadlocking latchbolt for 1-3/8 inch to 1-3/4 inch doors, and the Hager 2580 is a Grade 2 storeroom lever for 1-3/8 inch to 2 inch doors. The CL3555 is a classroom function lock where the lever works from either side until a key from outside locks the outside lever, which is what a teacher-controlled door needs and a supply closet does not.

6) Can a Kwikset or Baldwin lever be used in place of the Corbin Russwin CL3555 on a classroom door?

No. The Kwikset 200BRNL Breton is a Grade 3 passage lever for 1-3/8 inch to 1-3/4 inch doors and the Baldwin Estate 5103 is offered in passage, privacy, and dummy functions - none of those lock by key from the corridor. The CL3555 is a commercial Grade 1 keyed classroom lock with a deadlocking latchbolt and a single-cylinder keyed function, which is what a classroom door under a school lockdown procedure is specified for.

7) How does the Corbin Russwin CL3555 compare to the Dexter C1000 classroom lever?

Both are keyed classroom cylindrical levers for 1-3/8 to 1-3/4 inch doors, so either fits the same opening. The Dexter C1000 classroom uses a clutching lever, and the CL3555 uses a freewheeling lever when locked, so both resist someone wrenching a locked outside handle. The reason to go Corbin Russwin is key system and appearance continuity: the CL3555 takes Corbin Russwin conventional L4 cylinders or Corbin Russwin large format interchangeable cores, and comes in 14 finishes with the Armstrong, Newport and Princeton lever designs. If your facility is not on a Corbin Russwin keyway, that advantage disappears.

8) I'm doing 40 classroom doors and want them all on one key. Can these be keyed alike?

Keyed alike is an option on the CL3555, alongside keyed different, which is the default. For a building rollout, specify KA and note the key system detail on the order; there is a field for special cylinder and keying requirements. Standard conventional cylinders ship 0-bitted in the L4 keyway, which is what your locksmith wants if they are pinning to an existing master key system on site.

9) I need a storeroom or a passage lever to match my classroom doors on the same corridor. What pairs with the CL3555?

For a matched corridor you want the same lever design and finish across functions. If you need a non-keyed passage lever in a heavy duty Grade 1 chassis, the Falcon K101 covers 1-3/8 to 2 inch doors and is fire rated and non-handed; the Falcon T101 is another heavy duty Grade 1 passage lever. For storeroom function, the Cal-Royal AG05 is a storeroom lever with a deadlocking latchbolt for 1-3/8 to 1-3/4 inch doors, and the Hager 2580 is a Grade 2 storeroom lever for 1-3/8 to 2 inch doors. None of those will visually match a Corbin Russwin Newport or Armstrong lever, so if aesthetic match across the building matters more than mixing brands, stay within the Corbin Russwin CL3500 line.

10) What lever lock should go on an office or staff door in the same building as the CL3555 classrooms?

For an entry/office opening, the Dexter C1000 Series entry/office cylindrical lever lock is a Grade 1 keyed lever covering 1-3/8 inch to 1-3/4 inch doors, and the Cal-Royal AG00 entrance lever is a Grade 2 option with a 6-pin Schlage C keyway and a 2-3/8 inch backset over the same 1-3/8 inch to 1-3/4 inch door range. The CL3555 is a classroom function lock, so it does not offer the office lock-and-unlock-from-inside behavior those doors usually want.

11) Which heavy-duty lever lock matches the CL3555 on doors that do not need to be keyed?

For a non-keyed opening in the same corridor, the Falcon K101 is a Grade 1 heavy-duty passage cylindrical lock with non-handed levers, a fire rating, and a 1-3/8 inch to 2-1/4 inch door thickness range, and the Falcon T101 is a Grade 1 heavy-duty passage lever. The CL3555 is a keyed single-cylinder lock and is also non-handed with a fire rating, so pairing it with a Grade 1 passage lever keeps the duty level consistent across keyed and non-keyed doors.

12) What keyless lever lock can replace a keyed classroom lock where staff should not carry keys?

Mechanical pushbutton levers cover that case. The Lockey 2835 is a mechanical pushbutton keyless lever lock with passage function and ADA compliance for 1 3/16 inch to 2 inch doors, the Lockey 2835DC adds double combination, and the Lockey 1150 is a heavy duty mechanical keypad lever set for 1-1/8 inch to 2 inch doors. The CL3555 is a keyed lock with a conventional 6-pin L4 keyway cylinder, so credential control sits with the key system rather than with a code.

13) Which lever lock fits a door thicker than 1-3/4 inches when the CL3555 range stops short?

For thicker leaves, the Falcon K101 Grade 1 heavy-duty passage lock covers 1-3/8 inch to 2-1/4 inch doors, the Dexter C1000 asylum lock is Grade 1 for 1-3/8 inch to 2 inch doors, and the Hager 2525 Grade 2 entry lever covers 1-3/8 inch to 2 inch. The CL3555 lists a 1-3/8 inch to 1-3/4 inch door thickness range with a 2-3/4 inch backset.

14) Is an asylum or institutional function lever the same thing as a classroom lever lock?

No. An asylum function keys both sides, so the Dexter C1000 asylum lock is a Grade 1 keyed lever for 1-3/8 inch to 2 inch doors and the Arrow MK33-BD-CS is a heavy duty Grade 2 asylum lock with a conventional Schlage C keyway cylinder. On the CL3555 the inside lever is always free and only the outside lever is controlled by key, which is the behavior egress-rated classroom and corridor doors are specified for.

15) What lever styles and finishes does the Corbin Russwin CL3555 come in?

Three lever designs: Armstrong (AZD), Newport (NZD) and Princeton (PZD). Finishes run 14 deep, covering 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 satin bronze oil-rubbed, 613E and 613L dark oxidized satin bronze, 618 bright nickel, 619 satin nickel, 625 bright chrome, 626 satin chrome, 722 black oxidized bronze oil-rubbed, BSP black suede and WSP white suede powder coat. 626 satin chrome with the Newport lever is the common institutional pick, and if you are matching existing school hardware that is usually what is already on the doors.

16) Is the CL3555 tough enough for a high traffic school corridor, or should I be looking at a mortise lock?

It's a heavy duty commercial cylindrical lockset, not a residential one. The chassis sits on a steel substrate that's zinc dichromated for corrosion resistance, the levers are solid cast with no plastic inserts, and thrubolts hold the chassis from rotating in the door. Where a cylindrical lock still gives ground to a mortise lock is on doors that take real abuse or need auxiliary deadbolt security, since a mortise body carries more steel and more function options. For everyday classroom and office traffic on a bored door, the cylindrical chassis is the normal and cheaper prep to maintain.

17) What matching dummy lever pairs with a Grade 1 keyed classroom lever lock on an inactive leaf?

The BEST 9K Series 1DT single dummy trim is a Grade 1 heavy duty non-keyed dummy cylindrical lever, matching the duty level of the CL3555, which is a heavy duty Grade 1 lock. The Accentra 455LN Augusta is another Grade 1 heavy duty single dummy cylindrical lever, and the BEST 7KC Series 1DT is a Grade 2 medium duty dummy trim for lighter openings.

18) What lower-grade lever lock covers a light-traffic interior door in a building standardized on the CL3555?

The Cal-Royal AUS00 is a Grade 3 entrance/office lever with a solid brass forged body for 1-3/8 inch to 1-3/4 inch doors, and the Callan Artino is a Grade 3 entrance leverset. Both sit below the CL3555, which is a Grade 1 heavy duty commercial lock, so they suit interior doors that do not see classroom or corridor traffic.

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Does the Corbin Russwin CL3555 NZD 626 come with a warranty?

Absolutely. The Corbin Russwin CL3555 NZD 626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.

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Corbin Russwin CL3555 Grade 2 Classroom Heavy-Duty Cylindrical Lever Lock

Corbin Russwin CL3555-KEYED Heavy-Duty Grade 1 Classroom Cylindrical Lever Lock with ANSI F84 Function