... 12, 13, 14,16, 18, 20, and 24 threads per inch #3 Thread file pitches:9, 10, 12, 16, 20, ... 27, 28, and 32 threads per inch Taps: 1/4" - 9/16" popular sizes (course and ... :Yuhuan Huagang Auto Parts Factory is a manufacturer of Auto repair tools with well-equipped testing equipment ... welcome new and old customers from all walks of life to contact us for future business relationships and ...