UNF (Unified Fine Thread) Unified Fine (UNF) and Unified Coarse (UNC). American threads consist of two common and easily obtained thread patterns known as U. N.F and U.N.C. U.N.F [national fine] is exactly the same as the old S.A.E [standard american engineers] that existed before threads were unified.
Numbness in pinky finger may also be caused by damage to the nerve on the injured side of the finger. There are small nerves, which measure only about two to three millimeters in diameter, in the finger that run along each side. Damage to the finger's nerves may occur due to cuts or a serious hand injury.
This can happen when you are outside in extreme temperatures without gloves, or when you hold onto something cold, such an iced beverage. However, fingers that turn white and go numb may also be a result of a condition called Raynaud's Syndrome. Another phenomenon that can cause whiteness and numbness is Vibration-Induced White Finger (VWF). It's similar to Raynaud's, but VWF is caused by using vibrating hand tools, like jackhammers.