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| Jack rafter
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Rafter shorter than a common rafter; especially used in hip-roof framing. |
| Jack stud
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A partial stud nailed next to full studs to support the header at door (and some window) openings. |
| Jacket
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The enclosure on a water heater, furnace, pumps, or boiler. |
| Jackscrew
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Type of lifting device, which adjusts its height and the height of its load, by turning a threaded shaft in an internally-threaded sleeve. |
| Jackshaft
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Also called a countershaft, this solid, short round shaft is used for the transmission of power from a motor to a working part. |
| Jahn forming system
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Trade name of concrete forming accessories that are used to hold sheets of plywood in place when making concrete forms. The accessories include brackets, clips and ties. |
| Jalousie
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A type of window consisting of a number of long, thin, hinged panels. |
| Jalousie window
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Type of window made up of a number of rectangular panes of glass or louvers, placed in slots in a frame, one above the other. The panes are held in place by a pinned connection that rotates, allowing the panes to be opened simultaneously to provide a flow of air. When closed, the panes overlap slightly, preventing rain from entering the structure, however they do not seal tightly so this type of window works better in mild climates. It is often referred to as a louvered window. |
| Jam nut
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A nut, which is tightened against the primary nut, to keep it from loosening, when the primary nut is tightened to the needed torque. A jam nut may be the same as the primary nut or may be made of stamped sheet metal. |
| Jamb
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An exposed upright member on each side of a window frame, door frame or door lining. |
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