The F in UNF stands for fine pitch.
On the other hand, the C in UNC stands for coarse pitch .
For example: 5/8-11 UNC (11 peaks between 1 inch) 5/8-18 UNF (18 peaks between 1 inch)
The F in UNF stands for fine pitch.
On the other hand, the C in UNC stands for coarse pitch .
For example: 5/8-11 UNC (11 peaks between 1 inch) 5/8-18 UNF (18 peaks between 1 inch)