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.
Compression or entrapment, usually at the elbow, causes the pinky and ring fingers to become numb. Most right-handed people experience the numb fingers in the left hand because of common habits. Its nothing bad it has a lot of reasons why. The way you sleep, driving, and just using your arm as an arm rest.