Deltana 12BB 12" Barrel Bolt, Stainless Steel

The 12BB is a surface-mounted barrel bolt that goes on the inside face of the door, so it only works where you can reach the inside face when the door is closed. It throws a bolt into a strike or keeper on the jamb (or into the floor or head on a pair), giving you a secondary hold while the main lock is not in use. It is a residential-duty part, not a fire exit or life-safety device, so it is not the piece to specify on a rated opening or on a door that needs egress hardware.

Twelve inches overall. That is a long bolt by barrel bolt standards, so plan the mounting run: you need a clear, flat 12 inch stretch on the door face in line with where the bolt lands, clear of the lock, the glass stop, and any panel molding. On a shorter rail or a narrow stile door the 12 inch body may not lie flat, and a shorter barrel bolt from the same Deltana BB family is the part to look at instead.

That is the common use for a 12 inch bolt. On a pair, the inactive leaf takes a surface bolt top and bottom so it acts as the strike for the active leaf. Mount the 12BB vertically on the inside face, bolt up into the head and down into the floor or threshold. Where the pair is a rated or egress opening, this is the wrong class of hardware, since the 12BB is a residential surface bolt, and a proper flush bolt or vertical rod device is what belongs there.

No. A barrel bolt is thrown and retracted by hand from the inside only, so it cannot be operated from the corridor and it cannot be part of a keyed or master keyed system. For a unit entry a property manager needs to access, the 12BB is a supplement to the lock, not the lock. Use it on interior doors, storage rooms, gates, and inactive leaves where nobody needs outside control.

Solid stainless steel, both the material and the substrate, not a plated pot metal body. That is what makes it a reasonable pick for a door that sees weather or damp: a coastal entry, a pool gate, a basement or garage door. Model designation is 12BB32D.

32D is the satin stainless steel finish designation, and it is the only configuration the 12BB32D is built in. If you are matching hinges, pulls, and kick plates across a set of openings, 32D is the standard brushed stainless most commercial and multi-family jobs already run, so it will sit alongside existing satin stainless trim without looking off.