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.
Cubital Tunnel Syndrome. A common cause of tingling and numbness in the ring and small finger is cubital tunnel syndrome. Cubital tunnel syndrome refers to a problem related to compression of the ulnar nerve at the elbow within the cubital tunnel. Compression of the ulnar nerve will cause tingling and numbness, coordination disturbances in the small muscles of your hand, and weakness of hand grip and of pinch strength.