Schlage B520-652 Tailpiece, For Use With B560/63 Single Conventional Cylinder & Over 1-3/4" To 2-1/4" Doors

The B520-652 is the tailpiece for a Schlage B560 series single cylinder deadbolt with a conventional cylinder. It's the flat bar that runs from the back of the key cylinder through the door and drives the deadbolt mechanism. It is not a cylinder and not a lock body, so if the key turns but the bolt doesn't move, or the bolt is stuck part way, the tailpiece is the part you replace.

No. The B520-652 is specified for a single cylinder B560 with a conventional cylinder, meaning key outside and thumbturn inside. A double cylinder deadbolt is keyed both sides and uses a different drive part. Ordering this one for a double cylinder gets you a piece that won't engage.

On tailpieces the trailing code is a Schlage part designation rather than a visible finish choice, and many Schlage service parts are finish specific, so match the code exactly to what the lock calls for. Order it as B520-652 and nothing shorter.

Usually just the tailpiece, if the cylinder turns freely and the bolt assembly is sound. The B520-652 replaces only the drive bar between the cylinder and the bolt. If the key won't turn at all, the problem is in the cylinder, not this part, and if the bolt binds against the strike with the tailpiece removed, the bolt assembly or the strike alignment is at fault.

Commercial, per Schlage's own classification of the part. It's the service tailpiece for the B560 grade deadbolt line, which is what turns up on apartment entries, back of house doors and light commercial openings.