Do I need to order the LCN 4040XP closer X ST-3596 to get the cover screw to secure the snap on cover to the cylinder?

No.  As of June 27th, 2018--- the cover screw is now standard in the screw packs for the 4040XP, 4040XPT, 4000T, and 4040SE so ST-3596 is no longer needed.




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