Glossary “double walled tubing” Definition:
Tubing that has two layers metal and can be bent easily.

Glossary “double wishbone” Definition:
Term used for double A-arm type of suspension.

Glossary “double wrap” Definition:
A flexible type of brake band designed with two segments that provide flexibility, which increases self-energizing action, used as bands in an A/T.

Glossary “double offset constant velocity joint” Definition:
Another name for the type of plunging, inner CV joint found on many Ford and GM vehicles, as well as some imports.

Glossary “double overhead cam” Definition:
Engine having two camshafts placed in the cylinder head for more direct opening of the valves with less friction.

Glossary “double pivot control arm” Definition:
Term used for control arm.

Glossary “double pole double throw (DPDT)” Definition:
Term used to identify a switch configuration having terminals that connects one pair to either of the other two pairs of terminals.

Glossary “double pole single throw (DPST)” Definition:
Term used to identify a switch configuration having terminals that connect or disconnect terminals simultaneously.

Glossary “double reduction differential” Definition:
A differential that contains extra gears to provide additional gear reduction.

Glossary “double -J rim” Definition:
The double-J shaped safety locks on a rim, used to hold the inner and outer tire beads securely.

Glossary “double masking” Definition:
Using two layers of masking paper to prevent bleed-through or finish-dulling from solvents.

Glossary “double filament lamp” Definition:
A lamp designed for more than one function; used in the stoplight, tail light and the turn-signal circuits combined.

Glossary “double flare” Definition:
A flare on the end of tubing, made by folding it over to form a double face.

Glossary “double groove valve stem” Definition:
Valve stem having two keeper grooves.

Glossary “double hump heads” Definition:
Term used for camel-hump heads.

Glossary “double A-arm” Definition:
A suspension system using two A-arms or A-frames to connect the chassis to the wheel spindle.

Glossary “double acting shock absorber” Definition:
Shock that provides a dampening effect on both compression and rebound.

Glossary “double A-frame” Definition:
Term used for double-A arm.

Glossary “double Cardian joint” Definition:
A near-constant-velocity universal joint consisting of two Cardian joints connected by a coupling yoke.

Glossary “double clutch” Definition:
A driving technique to minimize gear clash when shifting gears with a manual transmission.