Schlage 36-079 Mortise Cylinder Blocking Ring, For Use Without Compression Ring

The 36-079 is a spacer ring for a Schlage mortise cylinder. It takes up the space between the cylinder and the trim so the cylinder face finishes where it should instead of sitting sunk in or standing proud of the escutcheon. You size it to the gap you have, which is why it is sold in several thicknesses. It is commercial mortise lock hardware, and it is the ring on its own, so the cylinder, cam and any keying are separate orders.

Measure how far off flush the cylinder face sits once it is threaded to the correct cam position, then take the ring nearest that gap. Four thicknesses are made: 1/8 inch, 3/16 inch, 5/16 inch and 1/2 inch. Thread the cylinder in dry first and check the cam engagement before you commit to a thickness, because a ring that is too thick will leave the cam short of the lock hub and a ring that is too thin leaves the cylinder buried.

It tells you which cylinder build-up the 36-079 belongs to. This ring is the one to use where the mortise cylinder is set up with no compression ring behind it, so the blocking ring alone takes up the space. If the assembly you are working on already uses a compression ring, the 36-079 is not the part for that setup and you want the blocking ring made to go with a compression ring instead. Worth checking what came out of the door before you order, because the two are not interchangeable.

Both 626 satin chrome and 613 oil rubbed bronze are made, and every thickness is offered in each finish, so picking the finish never limits which thickness you can get. Choose the finish to match the cylinder collar and trim already on the door, since the edge of the ring shows at the face.

Not necessarily. Blocking rings exist so a single cylinder length can be made to finish correctly across openings that differ slightly. With 1/8, 3/16, 5/16 and 1/2 inch rings in the 36-079 family, a maintenance shop can carry one cylinder length plus a small stock of rings rather than four cylinder lengths. Keep both finishes on hand if the building is mixed, since the ring is visible at the cylinder face.

No. The 36-079 is a spacer that sits behind the cylinder to correct how far it projects. It is not the decorative collar you see on the face, and it is not the lock cylinder, so it carries no keyway, no plug and no cam. If what you actually need is the keyed part, order the mortise cylinder and specify the keyway, length and cam separately; the blocking ring is what you add to make that cylinder finish flush on your particular door.