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Example (inch, fine): For 7 ⁄ 16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).
where is the tap drill size, is the major diameter of the tap (e.g., 3 ⁄ 8 in for a 3 ⁄ 8-16 tap), and / is the thread pitch (1 ⁄ 16 inch in the case of a 3 ⁄ 8-16 tap). For a 3 ⁄ 8 -16 tap, the above formula would produce 5 ⁄ 16 , which is the correct tap drill diameter.
All NEMA 1 devices are two-wire non-grounding devices (hot-neutral) rated for 125 V maximum. 1-15P plugs have two parallel flat blades, 1 ⁄ 4 inch (6.4 mm) wide, 0.06 inches (1.5 mm) thick, 5 ⁄ 8 – 23 ⁄ 32 inch (15.9–18.3 mm) long, and spaced 1 ⁄ 2 inch (12.7 mm) apart. 1-15R receptacles have been prohibited in new construction in ...
Closed-head steel barrels and drums now used for shipment of chemicals and petroleum products have a standardized bunghole arrangement, with one 2 inch NPT and one 3/4 inch NPT threaded bunghole on opposite sides of the top head. Some steel barrels are also equipped with a 2-inch threaded bunghole on the side.
In 1934 the dual plug system was introduced with the socket rated at 15 A and three sizes of plug, fused 2 A and 5 A plugs and a 15 A plug. The 15 A "dual plug" incorporated a socket with narrower apertures than a standard Wylex 15 A socket, that accepted only the narrow rectangular pins of the lower-rated plugs. [27]
The US military uses a variety of phone connectors including 9 ⁄ 32-inch (0.281-inch, 7.14 mm) and 1 ⁄ 4-inch (0.25 inch, 6.35 mm) diameter plugs. [42] Commercial and general aviation (GA) civil aircraft headsets often use a pair of phone connectors. A standard 1 ⁄ 4-inch (6.3
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