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A wingnut, wing nut or butterfly nut is a type of nut with two large metal "wings", one on each side, so it can be easily tightened and loosened by hand without tools. A similar fastener with a male thread is known as a wing screw [1] [2] or a wing bolt. [3]
Tree with fruit. Pterocarya stenoptera is quite similar to P. fraxinifolia.The major difference lies in the shape of the wings on the fruit: reminiscent of the wings of the common fly, they are connected to the two sides of the walnut shaped fruit, which is about the size of a chickpea.
The seeds are a small nut 5–10 mm across, with two wings, one each side. In some of the species, the wings are short (5–10 mm) and broad (5–10 mm), in others longer (10–25 mm) and narrower (2–5 mm).
The flowers appear in April, the male catkins thick and green, 7.5 – 12.5 cm long, the females longer with less dense flowers, bearing red styles forming fruiting catkins 30 – 50 cm long, the green, winged, nuts approximately 1.8 cm wide.
In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers, jam nuts, eccentric double nuts, [1] specialist adhesive thread-locking fluid such as Loctite, safety pins or lockwire in conjunction with castellated nuts, nylon inserts , or slightly oval-shaped threads.
Wingnut", wing nut or wing-nut, is a pejorative American political term referring to a person who holds extreme, and often irrational, political views. It is a reference to the extreme "wings" of a party, and shares a name with the hardware fastener also known as a wingnut .