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Membership on the B16 Standards Committee [1] and its Subordinate groups include a variety of representations from the field in various interest classifications. These interest classifications are; Manufacturer, Distributor, Material Manufacturer, Consumer/User, Designer/Constructor, Regulatory, Insurance/Inspection and General Interest.
For example, in an assembly with a bolted joint using four bolts, the PL quantity column will say "4" for the bolt PN, "4" for the nut PN, and "AR" for the liquid threadlocker that will be applied. AS: Aerospace Standards; Australian Standards: 1.
Servomotors in the industry are often mounted via a flange-like coupling to give the shortest possible leverage for high-torque uses. Industrial servomotors often use standardised mounting patterns, of which one example is a bolt circle of 4×130 mm diameter (approximately corresponds to a square pattern of 91.9 mm × 91.9 mm).
Various types of flanges are available, depending on construction. Flanges used in piping (orifice, threaded, slip-on, blind, weld neck, socket weld, lap-joint, and reducing) are available with a variety of facings, such as raised, flat, and ring-joint. Flange connections tend to be expensive because they require the precision forming of metal.
Four bolt holes and two locator pins are common to the Chevrolet and B-O-P patterns. Some transmissions, most notably the TH200-4R, take advantage of this by integrating both specifications into a "universal" bolt pattern casting.
These standard pipe threads are formally referred to by the following sequence of blocks: the words, Pipe thread, the document number of the standard (e.g., ISO 7 or EN 10226) the symbol for the pipe thread type: G, external and internal parallel (ISO 228) R, external taper (ISO 7) Rp, internal parallel (ISO 7/1) Rc, internal taper (ISO 7)