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| J bend
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The trap section, with a 180-degree bend, of a multi-piece P-trap, which is also called a return bend. |
| J factor
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Factor used by appraisers and investors to determine the changes needed in operating income to obtain a desired rate of return. This factor is determined after consideration of the location, rental, similar properties and cost of maintenance. |
| J hook
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Electrical wire in which a hook like bend in its end helps to shape and fit it around an electrical terminal. |
| J-channel
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Used for receiving siding on all sides of windows and doors, at rake edges of gables and in other miscellaneous situations. Deeper J-channels are for insulated siding, and narrower J-channels for non-insulated siding. |
| J-weight sander backing
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J-weight or 'jeans' sander backing is a lighter cloth material often used for sanding curves and other shapes that require a flexible abrasive product. |
| Jack
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Lifting device for, among other things automobiles, so they can be raised to a higher level temporarily while repairs are being done. Most are the hydraulic type or the screw type. |
| Jack arch
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This arch, also called a flat arch, straight arch, minor arch, segmented arch, or multi-centered arch, has a horizontal top surface, with a span of up to 6 feet, can support loads up to 1,000 pounds per square foot, with a rise to span ratio of 0.15 or less. |
| Jack hammer
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Device with a chisel or pointed bit, which is either pneumatic or electric and is used to break or cup up a surface. |
| Jack plane
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Hand tool, which consists of a long base plate with a sharply angled cutting blade, extending through the slot in the base. When the base plate is slid along a piece of wood, the blade shaves off thin layers of the wood, unless the extension is adjusted for thicker layers. |
| Jack post
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Screw jack or lifting device with wide based footing and a top plate for spreading the load. Used for raising and supporting a horizontal member, which is sagging, possibly a cracked floor joist, it can be left in place permanently. |
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