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Boil Tank

A very large tank of boiling solution used for cleaning large parts, such as engine blocks.

Boiling

A rapid change in the state of a liquid to a vapor by adding heat, decreasing pressure, or both.

Boiling Point

The temperature at which a liquid begins to boil.

Boiling The Hides

Smoking the tires during a drag race.

Bolster Plate

The flat, load-bearing surface under the front of a semi trailer, including the kingpin, which rests firmly on the fifth wheel when coupled.

Bolster Plate Height

The height from the ground to the bolster plate when the trailer is level and unladen.

Bolt

A round metal fastener that is threaded on one end and has a head on the other. Compare with a stud, which is threaded on both ends.

Bolt Circle Diameter

The diameter of an imaginary line running through the bolt hole center.

Bolt Grade

The strength of a bolt.

Bolt Hardness

The hardness of a bolt is identified by the number of lines on the head of the bolt. The more lines, the stronger the bolt.

Bolt On

An aftermarket accessory that can be installed without modification.

Bolt Pattern

Usually used to identify a type of wheel. Different vehicles require a different number of bolts to attach a wheel, while some may require the same number of bolts, but spaced differently.

Bolt Stretch

1. When a bolt is elongated and the shank and/or thread diameter is smaller than specification. 2. When a bolt is torqued as specified and, as a result, is stretched a predetermined amount.

Bolt Torque

The turning effort required to offset resistance as the bolt is being tightened.

Bolt-on

A part that is easy to install and remove. Bolt-on might describe a part that can be installed without welding (e.g., a bolt-on subframe connector), or an external engine component that can be installed without any disassembly (e.g., a cold air intake system, throttle body or cylinder head).

Bolye

Robert Boyle (1627-1691) Boyle's Law states that the volume of a given mass of gas (the temperature being constant ) varies inversely to it's pressure or, that the pressure and volume of a gas are inversely proportional.

Bomb

Performance term for a vehicle that is capable of extraordinary performance.

Bonded Lining

Brake lining attached to the pad or shoe by high strength, high-temperature adhesive, eliminating a need for rivets.

Bonding

The process of connecting two or more materials using chemicals or heat, or electrical or mechanical forces.

Bonding Lining

The lining attached to a brake shoe with an oven-cured adhesive.