irri - knoc
- joker stand
- joliotium
- jolly green giant
- Jomini hardenability
- Jominy test
- Jonsson knotters
- Jonsson screens
- Jordan decomposition
- JORP
- Josephson technology
- JOSS
- Joule heating
- joule heating of the electrolyte
- JOUR
- journal
- journal bearing bit
- journal bearing insert bit
- journal misalignment
- journal-bearing milled tooth bit
- journalization
