Schlage B520-685 S200 Tailpiece for Locks After Feb 2008

No. The B520-685 is the tailpiece for S200 Series locks built after February 2008. Schlage changed the part at that date, so an S200 manufactured before the cutoff takes the earlier tailpiece instead. If you are not sure of the lock's age, check the cylinder and tailpiece you pulled out against this one before installing.

Only for the ones built after February 2008. The B520-685 covers that population of S200 locks. Older S200 bodies use a different tailpiece, so a mixed-age building needs both on the shelf. Also worth knowing on Schlage service parts generally: many are finish specific, so match the part to the trim you have rather than assuming one number covers every door.

It is specified for the S200 Series, not for the B Series deadbolts. Despite the B in the part number, the compatibility called out for this tailpiece is S200. Fitting a tailpiece intended for another lock body usually means the blade length or the drive cutout is wrong, and the key will turn without moving the bolt.

The tailpiece is the flat metal blade that runs off the back of the cylinder and drives the lock's retractor. Turn the key, the cylinder plug turns, the tailpiece rotates and throws or retracts the latch. If a key turns freely but nothing moves in the door, a sheared or wrong-length tailpiece is the usual cause, and the B520-685 is the replacement for S200 interconnected locks.

Yes, it's a commercial part. The B520-685 is made of stainless steel, which is what you want in a tailpiece since it takes the full torque of every key turn and every thumbturn. For multi-family or MRO work where an S200 lock sees heavy daily use, this is the correct service part rather than a generic aftermarket blade.

No. The B520-685 is the tailpiece on its own, not a cylinder assembly. If your cylinder is worn, damaged, or you are rekeying to a different keyway, you'll need to order the cylinder separately and use this as the drive blade behind it.