what is compression ring

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The part number for a Schlage mortise cylinder blocking ring for use without compression ring is the 36-079 (specify dimension and finish).
The 20-001 is a conventional mortise cylinder with a straight cam, compression ring and spring for use on rose trim. For use with the L9060 outside cylinder or other straight cam applications.
The 30-001 is a conventional mortise cylinder with a clover cam, compression ring and spring for use on rose trim. For use with the L9000 mortise locks except for the L9060 outside cylinder.
Schlage has conversion kits to convert the classroom L/LV9070 to the classroom security L/LV9071 and the classroom holdback L/LV9076 to the classroom security holdback L/LV9077.  The...
Depending on the application, there are two types of blocking rings offered - One for use with a compression ring, and one for use without.  When a compression ring is used, it's diameter is l...
After selecting the correct blocking ring, specify the thickness.  The table below shows the different thicknesses that the rings are offered in.   
1 1/8" mortise cylinders fit the 650 series keyswitch.  The 650 series keyswitch when ordered with the cylinder, will come complete with the correct cylinder, cam, and any required blocki...
If blocking rings (PN 36-079) are needed, specify dimensions when ordering. See below for blocking ring (PN 36-079) dimensions.  Blocking Ring  Specify Dimension  1//8" ...