Determination should include

• use of a tap and drill chart
• selecting thread type(s) (e.g., national pipe taper [NPT], national fine [NF], national coarse [NC], metric).

Process/Skill Questions:

• How is a tap and drill chart used?
• Why are there different types of taps?
• What determines the type of threads needed?
• Why is the size of drill important for getting good threads?
• How do NPT, NF, NC, and metric threads differ?