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.
Tingling in the pinky finger can be caused by a disorder of the neck spine, anatomical abnormality around the clavicle (cervical rib, anomalous muscles resulting in thoracic outlet syndrome), disorders of the elbow (cubital tunnel syndrome), wrist (Guyon's canal syndrome), hand (hammer hand syndrome) or the pinky finger itself (injury).
The digit(s) then turn blue because of prolonged lack of oxygen. Finally, the blood vessels reopen, causing a local flushing phenomenon, which turns the digit(s) red. 1  Vibration white finger of VWF is a form of Reynaud's disease can cause the finger tips to become numb and turn white especially in the cold.