Trimco 3920-4 Series Heavy-Duty Surface Bolt

The Trimco 3920 Series is a Dutch door bolt, the part that pins the upper and lower leaves of a Dutch door together so the two halves swing as one. Drop the bolt and the door operates as a single slab; retract it and the top leaf works independently. It is a manual surface-mounted bolt, so it does no latching on its own and is always used alongside the door's lock or latch, not in place of it.

Throw is 1/2 inch. That is the engagement you get into whatever the bolt drops into, so any strike or mortised hole you already have needs at least that much usable depth behind the face. A 1/2 inch throw is short compared with a lock deadbolt, which is normal for a Dutch door bolt, it is aligning two leaves rather than securing an opening. Trimco offers the 3920 with multiple strike options, so pick the strike that matches how your leaves meet instead of forcing the bolt into an old prep.

No, and picking the wrong one is a common mistake. A Dutch door bolt like the Trimco 3920 mounts on the surface and joins the upper and lower halves of a single Dutch door so they move together. A barrel bolt is a general purpose surface latch for holding a door or gate shut against a frame. A flush bolt mortises into the edge of the inactive leaf of a pair of doors and throws into the head and threshold. If you are securing the inactive leaf of a double door opening, you want a flush bolt, not this.

Five finishes: 605 bright brass, 606 satin brass, 613 oil rubbed bronze, 625 bright chrome and 626 satin chrome. For a property manager matching a fleet of openings, those are standard BHMA finish numbers, so 626 satin chrome will read the same as the 626 on your lever sets and closers, and 613 matches oil rubbed bronze trim elsewhere in the building. Brass and bronze finishes sit on solid brass or bronze castings, so the bolt body is the same metal family as the finish name suggests.

Solid cast brass or bronze is the construction here, and Trimco rates the 3920 as a heavy duty surface bolt for commercial use, public and government facilities, retail, and multifamily. Cast bar stock does not flex or deform the way a formed sheet metal bolt does under repeated pulls. If your application is not a Dutch door, though, this is the wrong family, a bolt sized to align two leaves of one door is not a flush bolt for a pair of doors and not a substitute for a vertical rod device.

Three things decide the order: the model within the series, the finish, and the strike. The 3920-4 is the model designation, finish is chosen from the five BHMA numbers offered, and the strike is selected to suit how your two leaves meet since Trimco supplies several strike options for the series. Trimco also builds custom variations of the 3920 for openings the standard configurations do not cover.