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2. U-bolt - Wikipedia

   en.wikipedia.org/wiki/U-bolt

   A U-bolt is a bolt in the shape of the letter U with screw threads on both ends. U-bolts have primarily been used to support pipework. Because of this, U-bolt sizes are given in pipe measurements. A U-bolt is described by the size of pipe it is supporting. For example, a 40 Nominal Bore U-bolt would be asked for by pipe work engineers, and only ...

3. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   Even though #14 and #16 screws are still available, they are not as common as sizes #0 through #12. [citation needed] Sometimes "special" diameter and pitch combinations (UNS) are used, for example a 0.619 in (15.7 mm) major diameter with 20 threads per inch. UNS threads are rarely used for bolts, but rather on nuts, tapped holes, and threaded ODs.

4. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   In contrast to the 19-inch standards, ETSI also defined the size of the rack enclosure: the four allowed widths are 150, 300, 600, 900 millimetres (5.9, 11.8, 23.6, 35.4 in) and two allowed depths are 300 and 600 millimetres (12 and 24 in).

5. Computer case screws - Wikipedia

   en.wikipedia.org/wiki/Computer_case_screws

   The bolt end is typically hex-shaped, but may exceptionally be round to make removal more difficult. The hex diameter is 3/16", or 4.7mm. A 5mm hex socket might still fit, however where tightening or removal is required, care needs to be taken to select a nut driver with a sufficiently small outer diameter, as clearance between the jackpost and ...

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Similar to a wood screw, except that it is generally much larger running to lengths up to 15 in (381 mm) with diameters from 0.25–0.5 in (6.35–12.70 mm) in commonly available (hardware store) sizes (not counting larger mining and civil engineering lags and lag bolts) and it generally has a hexagonal drive head.

7. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...