The B600-086 is the replacement tailpiece for a Schlage B562P double cylinder deadbolt built with Everest or Primus cylinders. The tailpiece is the flat bar that runs from the cylinder through the bolt mechanism and actually turns the bolt, so it is the part you order when the cylinder turns freely but the bolt does not move, or when you are rebuilding a B562P and need the correct length bar for the door.

Yes. The B600-086 is the length used on doors over 1-3/4 inches up to 2-1/4 inches, so a 2 inch door is inside its range. On a standard 1-3/4 inch commercial door you need the shorter standard tailpiece instead, not this one. Tailpiece length is the one thing that has to match door thickness on a double cylinder deadbolt, because a bar cut for a thinner door will not reach the bolt hub through a thick door.

On a B562P double cylinder deadbolt, a key that turns with no bolt movement usually means the tailpiece is stripped, sheared, or too short to stay engaged in the bolt hub. The B600-086 is the correct replacement bar for that lock when the door is over 1-3/4 inches and up to 2-1/4 inches thick. Measure the door leaf before ordering, since the same deadbolt uses a different tailpiece length on a standard 1-3/4 inch door.

No. The B600-086 is specified for the B562P double cylinder deadbolt, which takes a keyed cylinder on both faces. A single cylinder deadbolt uses a thumbturn on the inside and a different drive part, so this bar is not the one to order for it.

Both. Schlage lists the B600-086 for B562P deadbolts fitted with Everest or Primus cylinders, so a facility that has standardized on either restricted keyway can carry the one part number for its thick-door deadbolts.