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Ja- Jack
- Mechanical or hydraulic device for lifting heavy equipment off the floor.
- Jackbolt
- A bolt or screw attached to the baseplate or foundation that is used to move or position the machine that is being moved.
- Jackscrew
- A bolt or screw attached to the baseplate or foundation that is used to move or position the machine that is being moved.
- Jarno
- A standard taper having 0.600 inch taper per foot used on some machine tools.
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