In manufacturing, potentially flammable and hazardous chemicals such as acetone and isopropyl alcohol are often stored in 55-gallon or larger drums for dispensing into smaller containers or at the point of use.
When it’s time to put threads in parts, particularly those made of difficult-to-machine materials, thread mills are often the right choice. Thread mills cut threads with a cutting head typically smaller than the hole, unlike taps that are sized to match the hole diameter.