Automotive Glossary

Automotive Glossary

Browse the glossary using this index

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A mechanical or hydraulic tool for lifting a vehicle. Should always be used with axle stands if under vehicle access is needed.

Jack Stands

Vehicle support equipment manufactured with a rated weight capacity. Used to support a vehicle when wheels are removed or when access to the underside is needed. Also known as axle stands.

Jam (Lock) Nut

A nut that is used to lock another nut or threaded component in position on a threaded rod or stud. Also lock nut - US term.

Jamb Switch

Switch fitted on a door jamb or pillar for operating the courtesy light or vehicle alarm system.


The deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems. Or informal music creation in a group!


Jet Air System


A calibrated nozzle in a gas or liquid injection system. In a carburettor used to regulate fuel and air flows.

Jet Needle

A small needle that works inside a jet (small hole) to control fuel flow in a carburettor.


A device for locating and holding a piece of work during machining operations.

Jiggle pin

Most thermostats have a Jiggle pin. Its function is to allow trapped air past a closed thermostat as a build-up of air in front of the wax capsule could cause engine damage.

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