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  2. Bolt circle - Wikipedia

    en.wikipedia.org/wiki/Bolt_circle

    Some of the most common bolt circle diameters on modern cars are 100 mm, 112 mm and 114.3 mm. [citation needed] The bolt circle of a car is one of several parameters that must be checked before buying new rims to make sure they will fit the car (along with wheel offset, hub diameter, and finally the diameter and width of the rim and tire).

  3. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    The tire wheel of Subaru BRZ S (DBA-ZC6) with optional parts. The bolt pattern determines the number and position of the bolt holes on the wheel to line up with your vehicle's studs on the mounting hubs. The bolt holes are spaced evenly about the bolt hole circle.

  4. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    The best example is Flanges, there are multiple holes in the Flanges, the circle through the center of these holes is known as the pitch circle, and the diameter of this circle is known as Pitch Circle Diameter, in short PCD. PDM, PDMS: product data management, product data manager [app], product data management system [app]

  5. Engineering fit - Wikipedia

    en.wikipedia.org/wiki/Engineering_fit

    Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.

  6. Printed circuit board - Wikipedia

    en.wikipedia.org/wiki/Printed_circuit_board

    Through-hole (leaded) resistors Through-hole devices mounted on the circuit board of a mid-1980s Commodore 64 home computer A box of drill bits used for making holes in printed circuit boards. While tungsten-carbide bits are very hard, they eventually wear out or break. Drilling is a considerable part of the cost of a through-hole printed ...

  7. Wall plug - Wikipedia

    en.wikipedia.org/wiki/Wall_plug

    Before commercial wall plugs, fixings were made to brick or masonry walls by first chiselling a groove into a soft mortar joint, hammering in a crude wooden plug and then attaching to the wooden plug. This was time consuming and required a large hole, thus more patching of the wall afterwards. It also limited the holes' location to the mortar ...

  8. Plug load - Wikipedia

    en.wikipedia.org/wiki/Plug_load

    Plug load is the energy used by products that are powered by means of an ordinary AC plug (e.g., 100, 115, or 230 V). [1] This term generally excludes building energy that is attributed to major end uses ( HVAC , lighting , water heating , etc.) [ 1 ]

  9. Spark plug - Wikipedia

    en.wikipedia.org/wiki/Spark_plug

    Spark plug with single side electrode An electric spark on the spark plug. A spark plug (sometimes, in British English, a sparking plug, [1] and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within ...