Dormakaba Mortise Cylinders

Dorma Mortise Locks, Cylinders, and the Brand Name Explained

Most people searching for "Dorma mortise lock" or "Dorma lock cylinder" are working on an existing building with DORMA hardware installed before 2015. That year, the German door hardware manufacturer Dorma - founded in 1908 and for decades one of the largest commercial hardware companies in the world - merged with Swiss-based Kaba Group to form dormakaba. The DORMA product line including the CL Series mortise locks and their associated cylinder family carried forward into dormakaba without discontinuation. The replacement cylinders for DORMA mortise locks are the dormakaba 90-J Series products on this page.

If you're looking for the full DORMA or dormakaba mortise lock catalog to identify which lock body is installed in your building, the model number is typically stamped on the face of the lock or on the inside of the case. The most common DORMA mortise lock series are the CL400, CL500, CL600, CL700, and CL800. The cylinder that fits each of these depends on the cam number - covered below.

What a Dormakaba Mortise Cylinder Is

A mortise cylinder is the plug-and-pin assembly that reads the key and transmits that rotation to the lock body. In a mortise lock, the cylinder sits in a dedicated pocket on the face of the lock body and is retained by a set screw. The back of the cylinder has a cam - a shaped metal piece that rotates when the correct key is inserted and drives the lock's bolt mechanism. Remove the set screw, pull the cylinder, insert a replacement, and the lock body stays in the door. This is the standard field service procedure for cylinder replacement on any DORMA or dormakaba mortise lock.

The 90-J designation on these products identifies them as conventional (pinned) mortise cylinders in the DORMA/dormakaba J keyway series. The J keyway is DORMA's proprietary keyway - not a standard commercial keyway compatible with other manufacturers' systems. Every key cut to fit a J keyway cylinder must be cut from a J section blank.

Cam Numbers: The Most Important Selection Detail

The cam number is the single most critical detail when ordering a replacement mortise cylinder. The cam engages the specific mechanism inside the lock body. The wrong cam produces a cylinder that physically seats in the lock but doesn't actuate the bolt correctly. In the 90-J catalog on this page, four cam configurations are available.

Cam 07 - the standard replacement cam for general DORMA mortise applications and the most broadly compatible option across the CL Series. When you're not certain which cam a specific lock body requires and can only identify it as a DORMA mortise lock, Cam 07 is the starting point.

Cam 10 - specific to the DORMA CL700 and CL800 mortise lock series and certain European DORMA lock applications. Used on heavier-duty mortise bodies where the cam throw is different from the standard CL Series.

Cam 11 - an alternative cam configuration used on specific DORMA lock bodies where the cam geometry must match a tighter actuation path.

Cam 12 - used on specific higher-security or specialized DORMA mortise lock bodies. Confirm against the existing cylinder or the lock body service documentation before ordering.

If you're replacing a cylinder on an installed DORMA lock and aren't certain of the cam number, remove the existing cylinder and read the cam number stamped on the cam itself before ordering. This eliminates the most common ordering error on DORMA cylinder replacements.

Cylinder Length: 1-1/8 Inch vs 1-3/8 Inch

Two lengths are available in the 90-J catalog. 

The 1-1/8 inch length is the standard for most DORMA CL Series mortise lock installations. 

The 1-3/8 inch length is used on thicker doors and specific lock body configurations where the standard length leaves insufficient cylinder protrusion for the set screw to engage correctly. Measure the existing cylinder or consult the DORMA service documentation for the specific lock body to confirm the correct length before ordering.

The 97-J SFIC Mortise Housing

The 97-J product on this page is not a complete conventional cylinder. It's an SFIC mortise housing - a cylinder body with a 7-pin SFIC core pocket but without any core installed. This is for facilities that run a small format interchangeable core program and want to bring DORMA or dormakaba mortise locks into the same key system. Drop in the facility's existing 7-pin SFIC core, and the mortise lock joins the master key hierarchy without rekeying or replacing the lock body.

The 97-J housing carries a 7/16 tapered ring, the same as the conventional 90-J cylinders, and seats in the same mortise cylinder pocket. Cam 11 is the configuration available in the current catalog.

Dormakaba Cylinder Family

Beyond the mortise cylinders on this page, the complete dormakaba cylinder catalog at americanlocksets.com includes dormakaba cores for interchangeable core systems, dormakaba cylinder housings, and dormakaba key blanks in packs of 50 for authorized commercial key cutting operations. The J section key blank is the correct blank for all 90-J conventional cylinder systems.