Dorma C570 Classroom Keyed Lever Lockset

Classroom function means the outside lever is locked and unlocked only by key from the outside. The inside lever always retracts the latch for free egress, and there is no button or turn on the inside, so nobody can lock the room from within. The C570 is a single cylinder lock, keyed on the outside only. That is why this function suits classrooms, offices and storage rooms where control of who can lock the door needs to sit with whoever holds the key.

Yes. The C570 covers 1-3/8 inch through 1-3/4 inch doors, so standard 1-3/4 inch commercial wood or hollow metal doors are in range, as are the thinner 1-3/8 inch interior doors common in older buildings. The chassis adjusts across that range, so you are not ordering a thickness-specific part.

The C570 is a 2-3/4 inch backset lock and ships with the 15250 latch, a 1 inch square corner faceplate. Measure from the door edge to the center of the existing bore: if it is 2-3/4 inch you are in the right prep for a standard 161 cylindrical bore. If your doors are prepped at 2-3/8 inch backset, which is the other common one, this is the wrong lock for that opening.

It comes with the 5001 strike, an ANSI 1-1/4 x 4-7/8 inch square corner strike. That is the standard ANSI/ASA frame prep on commercial hollow metal frames, so if your frames are already cut for a 4-7/8 inch strike the C570 drops straight in without reworking the jamb. Frames cut for a smaller T-strike would need the prep enlarged.

Yes, order the J option. The C570 is offered two ways: D for a conventional cylinder, and J for SFIC less core, which arrives without a core so you can drop in the small format interchangeable core from your existing keying system. Every finish and lever combination is offered in both cylinder types. If you are not on an IC system, take the D conventional cylinder instead.

It is an ANSI/BHMA A156.2 Series 4000 Grade 2 lock, certified, with an F84 function designation. Grade 2 is the standard commercial duty tier, above residential and below Grade 1 heavy duty. For hotels, apartments, churches, municipal buildings, retail, offices and warehouses it is the right level. For a high traffic school entry or an abused opening you would step up to a Grade 1 cylindrical lock instead.

The Dorma C570 is a Grade 2 keyed cylindrical lever lockset in classroom function with a 2-3/4 inch backset and a 1-1/4 inch x 4-7/8 inch ANSI square corner strike. The nearest peer in the same duty class is the Marks USA 175RF, a Grade 2 clutched lever cylindrical lockset that shares the 2-3/4 inch backset and ANSI strike, but it is built in storeroom function rather than classroom - storeroom keeps the outside lever locked at all times, while classroom lets a key lock and unlock the outside lever. If the opening needs the classroom function specifically, the C570 carries it and the 175RF does not.

The Dorma C570 is certified to ANSI/BHMA Grade 2. When a specification calls for Grade 1 in classroom function, the TownSteel FCE-2000 is a Grade 1 heavy duty cylindrical lockset in classroom function, and the Schlage XE360M is a Grade 1 tubular lock in classroom/storeroom function. Both of those are electronic - the FCE-2000 uses RFID credentials and the XE360M uses a mobile smart reader - so moving up a grade in classroom function here also means moving from a mechanical key to a credential-based lock, which changes how the door is keyed and powered.

The Dorma C570 chassis adjusts for doors 1-3/8 inch to 1-3/4 inch thick. For a thicker leaf, the TownSteel XCE-2000 covers 1-3/4 inch to 2 inch in classroom function, and the TownSteel XCE-9000 covers the same 1-3/4 inch to 2 inch range in a classroom intruder configuration. Both are Grade 1 keypad locksets. On a thin door at the low end, the C570 reaches down to 1-3/8 inch where those two start at 1-3/4 inch.

Yes. The Dorma C570 is ordered with either a D conventional cylinder or a J SFIC less core, so a facility already keyed on small format cores can drop its own core into the classroom chassis. Among the peers, the Marks USA 175RF is also a Grade 2 small format IC lockset supplied less core, and the Marks USA 195RAB is a Grade 1 less-core lever in entrance/office function. The difference is function: the C570 is classroom, the 175RF is storeroom, and the 195RAB is entrance/office.

The Dorma C570 is a keyed classroom lockset: the outside lever is locked and unlocked by key from the corridor side. A classroom intruder lock adds the ability to secure the door from inside the room. Among the peers, the TownSteel FCE-4000 is a Grade 1 RFID electronic intruder classroom cylindrical lockset for 1-3/4 inch doors, and the XCE-9000 is a Grade 1 classroom intruder keypad lockset for 1-3/4 inch to 2 inch doors. If a lockdown-from-inside requirement is on the drawing, that is a different lock than a standard classroom function.

Handing on the C570 depends on which lever you pick, so it is not a blanket yes or no. The chassis itself is a cylindrical lock, but the lever choice governs it, so decide left or right hand for the opening at the time you select LC, LG or LR lever style rather than assuming the lock is reversible.

Six finishes across the C570: 626 satin chrome, 625 bright chrome, 605 bright brass, 606 satin brass, 613 oil rubbed bronze and 619 satin nickel. All six are available with every lever style and with either cylinder type, so you can standardize a whole building on one finish and still mix lever designs or IC and conventional cylinders opening to opening.

The C570 is a purely mechanical key-in-lever lock, so if you want code entry you need a different chassis. For classroom function with electronics, the TownSteel XCE-2000 Series is a Grade 1 keypad cylindrical lockset for 1-3/4 to 2 inch doors, and the TownSteel FCE-2000 Series is a Grade 1 classroom lockset with RFID. Both are heavy duty Grade 1 rather than the C570's Grade 2, and both need thicker doors than the C570's 1-3/8 inch minimum, so check the door before switching.

For a keyed lever a step up in duty, the Marks USA 195RAB is a Grade 1 Survivor Series entry clutched lever, supplied less core. The clutched lever is the difference that matters on abused openings: force on a locked lever spins free instead of loading the chassis. The C570 is Grade 2 with a 2-3/4 inch backset. If you want to stay Grade 2 but need storeroom rather than classroom function, the Marks USA 175RF SFIC is a Grade 2 storeroom clutched lever at the same 2-3/4 inch backset.

The C570 stops at 1-3/4 inches, so a thicker door is out of range. Among cylindrical locksets that go further, the Cal-Royal CAL20 privacy and CAL30 passage locks cover 1-3/8 to 2 inches, both Grade 1, and the Orca Hardware OCL250 is a Grade 2 keyed entrance lockset. Note the Cal-Royal pair are privacy and passage, not keyed classroom, so if you need key control on a thick door you are changing function as well as brand.

No, they are part of the lock. Standard supply is the 15250 latch with a 2-3/4 inch backset and 1 inch square corner faceplate, plus the 5001 ANSI 1-1/4 x 4-7/8 inch square corner strike. What you do still decide at order time is lever style, finish, and whether you want a conventional cylinder or SFIC less core, and if you take the SFIC route you supply the core.

No - those are different functions. The Dorma C570 is a keyed classroom lockset with a single cylinder. The Cal-Royal CAL20 is a Grade 1 privacy/bed/bath lock and the CAL30 is a Grade 1 passage lock; neither is keyed, so neither can control access the way a classroom function does. What they do offer is a wider door range, 1-3/8 inch to 2 inch, against the C570's 1-3/8 inch to 1-3/4 inch. Use them on interior openings that need no key, and keep the C570 where the door has to lock.

The Dorma C570 is a keyed classroom lever lockset. On doors in the same building that only need latching or a thumbturn, the Orca Hardware OCL210 is a Grade 2 medium duty passage cylindrical lockset, the OCL240 is a Grade 2 medium duty privacy lockset, and the OCL2170 is a Grade 2 half dummy lever for an inactive leaf. Specifying those alongside the C570 keeps the whole set at Grade 2 while reserving the keyed classroom chassis for the doors that actually lock.

They are close in build and different in function. The Stanley QCL150 is a Grade 2 entry lever with a square 2-3/4 inch backset latch and a 4-7/8 inch x 1-1/4 inch ASA strike, supplied less cylinder - the same backset and strike size the Dorma C570 uses with its 15250 latch and 5001 ANSI strike. But the QCL150 is entrance function and the C570 is classroom. Entrance is locked and unlocked from the inside button or turn; classroom is controlled only by key from the outside, which is what most school and institutional specs call for.

The Dorma C570 is a lever lockset, and the Marks USA 110AB is a Grade 2 round knob entry lockset with a 2-3/8 inch backset. Two things differ beyond the trim: a round knob is not an ADA compliant operable part where levers are required, and the 110AB's 2-3/8 inch backset does not match the C570's 2-3/4 inch, so it will not land on the same bore-to-edge prep. If the existing doors are prepped 2-3/4 inch and the code path calls for lever trim, the C570 is the one that drops in.

A cylindrical lock like the C570 goes into a bored hole through the door face plus an edge bore for the latch, which is the simpler and quicker prep and the reason it dominates on retrofits. A mortise lock requires a full pocket routed into the door edge. If your doors are already prepped for a cylindrical lock at 2-3/4 inch backset, staying cylindrical avoids door machining altogether. Mortise makes sense where you need higher duty, more complex functions, or a deadbolt and latch in one case.