For locating a machined hole, recess or mortise, the distance from an edge or surface to the center or edge of the hole, recess or mortise. Ball-bearing Hinge
A heavier-duty hinge than the standard hinge, with bearings supporting the pivots. Ball-bearing hinges are usually used for heavy doors that will be in commercial or industrial use. Provides smoother, quieter operation. Boot
A term used for the rubber part at the bottom or top end of an astragal, which beds the astragal end and seals between the end and the door frame or sill.
Boss, Screw Boss
A feature of a part that enables the fastening of a screw into the feature, thereby allowing assembly of the part with another. Screw bosses are common features of molded plastic lite frames and extruded aluminum door sills.
In door and sidelite assemblies, a term used to differentiate door and sidelite units that are first framed as separate units, with heads and sills separate, and the width of the door or sidelite panels. Box-framed doors are joined to box-framed sidelites.
A small nail with a small head, usually used to fasten small trim and moldings.
A moulding, used to trim the outside edge of a door frame. Brickmould is most often applied to prehung units.
A term usually used in masonry construction to describe a door frame or a subframe in a masonry opening, around which a steel door frame wraps and is fastened.
A type of hinge commonly used to assemble doors. Butt hinges are often referred to as simply butts.
An organic compound, used in the door business as a sealant. It is naturally black and is heated and pumped through nozzles or pumped cold.