Schlage Commercial L583-447 Mortise Cylinder Adams Rite MS Cam

That is what the L583-447 is built for. It is a Schlage mortise cylinder supplied with the Adams Rite MS cam, which is the cam an Adams Rite MS deadlock needs to drive the bolt. A standard straight-cam mortise cylinder will thread into the housing but will not operate an MS bolt, so the cam is the whole reason to order this part number rather than a plain L583.

The MS cam on the L583-447 covers cylinder lengths of 1-1/4 inch, 1-1/2 inch and 1-3/4 inch. Measure from the face of the cylinder to the back shoulder on the one you are pulling out, and match it. Door thickness and how deep the cylinder sits behind the escutcheon or trim drive which of the three you need, so pull the old one before ordering.

Schlage lists the L583 series as compatible with mortise locks generally, but the -447 variant ships with the Adams Rite MS cam specifically. A conventional mortise lock case usually wants the standard Schlage cam, so ordering the -447 for a normal mortise lockset gets you a cylinder that turns without retracting anything. Order the MS cam version only where an Adams Rite MS bolt is in the door.

The Schlage L583-447 is a single modular mortise cylinder supplied with the Adams Rite MS cam and covers cylinder lengths of 1-1/4 inch, 1-1/2 inch and 1-3/4 inch, so it is the one to order when the cylinder has to drive an Adams Rite MS deadlock. The Calibre CL1000-KA2 is sold as a pair of mortise cylinders, 6-pin in the Schlage C keyway, keyed alike in pairs. If you are matching two openings to one key on standard mortise prep, the Calibre pair addresses that; if the cam has to suit an Adams Rite MS lock, the L583-447 is the cam-specific part.

Treat them as different parts. The L583-447 is built specifically with the Adams Rite MS cam and is dimensioned for 1-1/4 inch, 1-1/2 inch and 1-3/4 inch cylinder lengths, which is what an MS deadlock needs to throw. The Calibre CL1000-KA2 is listed as a 6-pin Schlage C mortise cylinder pair keyed alike; no Adams Rite MS cam is part of how it is described, so it is the wrong choice for that lock body even though both are mortise cylinders. Match the cam to the lock first, keyway second.

It is a modular cylinder, which means the plug and housing come apart so the length can be built up and the keyed plug swapped without replacing the whole cylinder. For a locksmith that means you can key it into an existing Schlage system at the bench rather than ordering a fixed-length keyed cylinder for every opening.

It is a Schlage L Series modular mortise cylinder, so the plug keys to Schlage cylinders and can be pinned into a Schlage master system by your locksmith. The modular build is what makes that practical, since the keyed plug is a separate piece from the length housing. Specify the keyway you are already running when you order.

The L583-447 is ordered as a single mortise cylinder with the Adams Rite MS cam, so two would have to be keyed to your system separately rather than arriving matched. Where the requirement is simply two mortise cylinders that share one key out of the box, the Calibre CL1000-KA2 is furnished as a pair, 6-pin Schlage C, keyed alike in pairs. The deciding factor is the lock: the L583-447 carries the Adams Rite MS cam for MS deadlocks, and the Calibre pair is described as standard mortise cylinders.

Standardizing usually comes down to what the lock bodies are. The Schlage L583-447 is a commercial modular mortise cylinder for mortise locks, and the modular build plus the three covered lengths of 1-1/4 inch, 1-1/2 inch and 1-3/4 inch let one part number serve doors of differing thickness where the Adams Rite MS cam is required. The Calibre CL1000-KA2 gives you 6-pin Schlage C cylinders arriving keyed alike in pairs, which suits paired openings you want on a single key. Many facilities carry both: the MS-cam part for aluminum storefront deadlocks and the standard pair for everything else.

The L583-447 is a Schlage Commercial product from the L Series mortise line, not a residential cylinder. Adams Rite MS deadlocks live in aluminum storefront and entrance doors, which is exactly where this cam pairing belongs, so it suits glass front installers and commercial property maintenance rather than house doors.