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Shelf where holes are placed with 32 mm distance center-to-center for mounting of shelf supports and individual shelves. The 32 mm cabinetmaking system is a furniture construction and manufacturing principle used in the production of ready-to-assemble and European-style, frameless construction custom cabinets and other furniture.
In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm. The tolerances necessary to make the tools usable are listed in documents such as ASME/ANSI B18.2.2 for U.S. standards. [ 1 ]
An earlier patent covering both square-socket- and triangle-socket-drive wood screws, U.S. patent 161,390, was issued to Allan Cummings of New York City on March 30, 1875. As with other drive types conceived and patented in the 1860s through 1890s, it was not manufactured widely during its patent lifespan because of the difficulty and expense ...
A square screw drive uses four-sided fastener heads which can be turned with an adjustable wrench, open-end wrench, or 8- or 12-point [67] sockets. Common in the 19th and early 20th centuries, when it was easier and cheaper to manufacture than most other drives, it is less common today (although still easy to find) because the external hex is ...
Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. The gradual accumulation of air in a concentric reducer could result in a large bubble that could eventually cause the pump to stall or cause cavitation when drawn into the pump. Eccentric reducers exhibit a unique design with one side having ...
Detail of a double-cut flat file showing cutting surfaces on both wide and narrow faces. A file is a tool used to remove fine amounts of material from a workpiece. It is common in woodworking, metalworking, and other similar trade and hobby tasks.
The width of devices that are mounted on a 35 mm "top hat" DIN rail generally use "modules" as a width unit, one module being 18 mm wide. For example, a small device (e.g. a circuit breaker) may have a width of 1 module (18 mm wide), while a larger device may have a width of 4 modules (4 × 18 mm = 72 mm).
A lathe of 1871, equipped with leadscrew and change gears for single-point screw-cutting A Brown & Sharpe single-spindle screw machine. Fasteners had become widespread involving concepts such as dowels and pins, wedging, mortises and tenons, dovetails, nailing (with or without clenching the nail ends), forge welding, and many kinds of binding with cord made of leather or fiber, using many ...