Engine 2014: General Subjects

1. A 1/4 inch in diameter with a pitch of 20 threads per inch
2. B 1/2 inch long having a total of 20 threads
3. C a total of 20 threads with a pitch of 1/4 inch
4. D 1/20 of an inch long and 1/4 inch in diameter

Tip: press A-D to answer