Dorma CL750 Grade 2 Entry/Office Keyed, Single Cylinder Lever Lockset

Both. The CL750 covers a door thickness range of 1-3/8 inch to 1-3/4 inch, so it handles standard 1-3/4 inch commercial doors and the thinner 1-3/8 inch interior doors still found in older buildings. It's a through-bolted chassis, which is what lets it clamp across that range and resist loosening from vibration on a high-traffic opening.

The CL750 is specified with a 2-3/4 inch backset, the deeper of the two standard bored-door backsets. If your existing doors are prepped at 2-3/8 inch, the cross-bore centerline sits a half inch closer to the edge and this latch will not reach correctly. Measure from the door edge to the center of the 2-1/8 inch bore before you order a quantity for a building.

Entry/Office means the outside lever is locked or unlocked by key from outside, and the inside lever always retracts the latch for free egress. It's the F82 ANSI function, keyed one side only (single cylinder). That's the right pick for an office suite, a tenant unit door, or a back-of-house entrance where staff need to leave the door unlocked during business hours and key it down at close. If you need the outside lever locked at all times with key-only entry, you want a storeroom function instead, such as the Marks USA 175RF.

No handing to specify. The CL750 is non-handed, so one part number covers left and right hand doors and either swing. For a property manager stocking spares across a building, that means a single SKU per finish and lever design instead of pairs.

Three cylinder choices on the CL750. D gives you a conventional cylinder in SC keyway with two keys, ready to hang. J is prepped for small format interchangeable core and ships less core, so you drop in your facility's SFIC. L is a conventional cylinder less core, for keying into an existing conventional system at your locksmith's bench. If you're standardizing a campus on SFIC, order J and keep the cores on your own control key.

The CL750 ships with a 1/2 inch throw latch bolt with an auxiliary deadlocking plunger, and the standard strike is an ANSI T strike, 1-1/4 x 4-7/8 inches, 1-3/16 inch lip, square corner. If your frames are already prepped for a full ANSI 4-7/8 inch strike, it drops straight in. Frames cut for a small 2-3/4 inch T strike, like the 118F strike supplied with the Stanley QCL200, will need the opening enlarged or the new strike will not sit flush. The deadlocking plunger has to land on the strike face, not in the cutout, or the latch can be carded.

The CL700/CK700 Series cylindrical locks are UL listed for UL 10C, the positive pressure fire test standard for door assemblies. They're also ANSI/BHMA A156.2 Series 4000 Grade 2 certified. Grade 2 is the medium duty commercial tier, which suits offices, tenant entries and light institutional traffic. For an opening that sees continuous public abuse, step up to a Grade 1 entry lever such as the Marks USA 195RAB.

The Stanley Security QCL150 is the nearest match. It is a Grade 2 entrance lever with a bent Sierra lever on a rose, supplied less cylinder, with a 2-3/4 inch backset latch and a 4-7/8 inch x 1-1/4 inch ASA strike. The Dorma CL750 is also a Grade 2 entry/office keyed lever with a 2-3/4 inch backset and an ANSI T strike measuring 1-1/4 inch x 4-7/8 inch, so the door prep and strike cutout line up. Where they differ is the cylinder path: the CL750 is offered as a conventional cylinder with SC keyway and two keys, as a conventional cylinder less core, or as an SFIC less core, while the QCL150 is a less-cylinder product only.

Step up to the Marks USA 195RAB Entry Clutched Lever Lockset, a Grade 1 Survivor Series entrance/office lever supplied less core with an American lever design. The Dorma CL750 is ANSI/BHMA Grade 2 with the same entry/office function, so the 195RAB keeps the function and raises the cycle and strength class. The clutched lever on the 195RAB is the practical difference for abuse-prone openings, and because it ships less core you will need to supply the cylinder, whereas the CL750 can be ordered with a conventional cylinder in SC keyway with two keys.

The Dorma CL750 is an entry/office function, meaning the outside lever can be left unlocked for business hours. For an opening that must stay secured with key entry only, use a storeroom function instead: the Marks USA 175RF SFIC is a Grade 2 storeroom clutched lever lockset, small format IC less core, with a 2-3/4 inch backset and an ANSI strike. That matches the CL750's 2-3/4 inch backset and Grade 2 rating, so the door prep carries over, and it accepts SFIC cores the same way the CL750's SFIC less core version does.

Three lever designs, LC, LG and LR, and six finishes: 605 bright brass, 606 satin brass, 612 satin bronze, 613 oil rubbed bronze, 625 bright chrome and 626 satin chrome. If your building is standardized on 626 satin chrome, which most commercial work is, the CL750 matches, and the same lever design can be carried across passage, privacy and entry openings in the CK700 family so the trim looks consistent down a corridor.

A mechanical keyed lever is the right call when access is controlled by a physical key system and you want no batteries, no programming, and no audit requirement. The CL750 is keyed one side with a conventional or SFIC cylinder. If you need to issue and revoke codes without rekeying, or you want an audit trail, look at a standalone keypad cylindrical lock instead, such as the Alarm Lock Trilogy T2 DL2700 or the TownSteel XCE-2000. Note those electronic units carry different door thickness ranges, the DL2700 at 1-5/8 to 1-7/8 inch and the XCE-2000 at 1-3/4 to 2 inch, so they will not cover a 1-3/8 inch door the way the CL750 does.

The Dorma CL750 is the keyed entry/office lever, so the non-keyed openings need different functions. The Orca Hardware OCL210 is a Grade 2 passage cylindrical lockset, the OCL240 is a Grade 2 privacy cylindrical lockset, and the OCL2170 is a Grade 2 half dummy lever for inactive leaves - all three are medium duty. That keeps the whole run at Grade 2, matching the CL750's ANSI/BHMA Grade 2 rating, with the keyed function only where you need it. Lever styling and finish will differ between the Dorma and Orca lines, so confirm the trim if visual match across the corridor matters.

They are close on the core specs. The Orca Hardware OCL250 is a Grade 2 entrance cylindrical lockset rated medium duty, and the Dorma CL750 is a Grade 2 entry/office cylindrical lever lockset, so both are keyed entrance-function bored locks in the same grade. The deciding factors are trim and keying. The CL750 is ordered by lever design - LC, LG or LR - in six finishes from 605 bright brass through 626 satin chrome, and with a conventional SC-keyway cylinder, a conventional less core, or an SFIC less core. If you are keying into an existing SFIC system or need one of those specific lever profiles, the CL750 is the one that carries those options.

Only if the opening will accept a knob and a 2-3/8 inch backset. The Marks USA 110AB is a Grade 2 entrance/office round knob lockset with a 2-3/8 inch backset in satin stainless steel. The Dorma CL750 matches it on grade and on entry/office function but is a lever with a 2-3/4 inch backset, which is the standard commercial prep. Swapping in the 110AB on a door bored at 2-3/4 inch means a different latch backset, and a knob will not meet openings where lever operation is required.

The Dorma CL750 is an entry/office keyed lever, which is not a classroom or intruder function. For classroom openings, the TownSteel FCE-4000 is an RFID electronic intruder classroom cylindrical lockset, Grade 1 heavy duty, and the XCE-9000 is an electronic classroom intruder cylindrical lockset with a keypad, also Grade 1 heavy duty. Both are built around a classroom function the CL750 does not offer. Note the leaf: the FCE-4000 is listed for 1-3/4 inch doors and the XCE-9000 for 1-3/4 inch to 2 inch, while the CL750 spans 1-3/8 inch to 1-3/4 inch.

The Lockey 1600 is a heavy duty mechanical keyless knob lock with an adjustable backset, and the Lockey 2830 is a mechanical pushbutton keyless knob lock with an auto-locking passage function; both cover doors from 1-1/8 inch to 2 inch. Neither uses a key or a battery, where the Dorma CL750 is a keyed single-cylinder lock. The trade is trim and function: both Lockey units are knobs rather than the CL750's lever, and the 2830 is a passage function, so it will not provide the secured entry/office operation the CL750 gives. The Lockey thickness range also reaches below the CL750's 1-3/8 inch lower limit, which helps on thinner leaves.

The Stanley Security QCL200 is a cylindrical lock supplied keyed different in the SC keyway, with a 118F ANSI strike measuring 1-1/8 inch x 2-3/4 inch. The Dorma CL750 shares the SC keyway on its conventional cylinder version, which ships with two keys, but its standard strike is an ANSI T strike at 1-1/4 inch x 4-7/8 inch with a 1-3/16 inch lip and square corner. That is the practical difference: the QCL200 comes with the smaller 1-1/8 inch x 2-3/4 inch face strike, so confirm which strike cutout the frame already carries before substituting either way.

The CL700/CK700 family is built with both, LR, LC and LG lever designs or KR and KB knob designs on the same cylindrical chassis. Levers are the usual choice on commercial and institutional openings because they can be operated without grasping or twisting; knobs still get specified on utility and storage doors. The CL750 as configured is a lever lockset. If you want a Grade 2 keyed knob for an entrance opening, the Marks USA 110AB is a round knob entrance lockset, though it uses a 2-3/8 inch backset rather than 2-3/4.

The Marks USA 195N is a Grade 1 Survivor Series passage lever lockset with an American lever, listed as ADA compliant. It suits corridor and hall doors that need lever operation without keying. The Dorma CL750 is the keyed entry/office version with lever trim and is ANSI/BHMA Grade 2, so if you are mixing both on one floor the 195N is the higher grade of the two. For a keyed opening in the same Marks family, the 195RAB is the Grade 1 entrance clutched lever, less core.