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For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use. The 85% and 90% rules works best in the range of 1 ⁄ 4 –1 in (6.4–25.4 mm), the sizes most important on many shop floors. Some sizes outside that range have different ...
where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.
NPT is defined by ANSI/ASME standard B1.20.1. [ 4 ] The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length ( 3 ⁄ 4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread.
Yalda Night, or Shab-e Yalda (also spelled Shabe Yalda), marks the longest night of the year in Iran and in many other Central Asian and Middle Eastern countries.
This year, it falls on Saturday 21 December at 9:21am, while the sun is expected to set at 3:51pm. This means there will be 7 hours 49 minutes and 42 seconds of daylight.
Iranian people celebrate the night of the Northern Hemisphere's winter solstice as, "Yalda night", which is known to be the "longest and darkest night of the year". Yalda night celebration, or as some call it "Shabe Chelleh" ("the 40th night"), is one of the oldest Iranian traditions that has been present in Persian culture from ancient times ...
The longest night happens on the solstice because the hemisphere is in its furthest position from the sun. That occurs each year on Dec. 21 or 22. This year, it falls on Dec. 21 at 4:21 a.m ET ...
Blue Christmas (also called the Longest Night) in the Western Christian tradition is a day in the Advent season marking the longest night of the year. [ 1 ] [ 2 ] On this day, some churches in Western Christian denominations hold a church service that honours people that have lost loved ones and are experiencing grief.