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| Counterbore
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The increase of the diameter of an opening for only part of the length. Holes though a material may have a one-inch sized diameter of half of the length with only a 3Ú4 inch diameter for the balance of the hole, making it counterbored to a diameter of one inch to a depth of 1Ú2 inch. |
| Counterclaim
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Counter action by a defendant against a plaintiff in a legal action. |
| Counterclockwise
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Movement in the direction opposite of the hands of a clock. |
| Counterflashing
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Substance or material used at the top of a chimney at the roof to inhibit the development of moisture and to protect the metal with one end embedded in the masonry and the other edge overlapping the roof flashing. |
| Counterflow heat exchanger
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A heat exchanger in which two fluids flow in opposite directions for transfer heat energy from one to the other. |
| Counteroffer
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A response to an offer with a revised offer. |
| Counterpoise
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A state of equality between opposing forces. |
| Counterrotating
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Rotating in opposite directions. |
| Countershaft
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Also called a jackshaft, this solid, short round shaft is used for the transmission of power from a motor to a working part. |
| Countersink
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To enlarge a hole in the wood, metal, etc. so that the head of the screw or bolt will fit flush with the surface or below it; to sink the head of a bolt or screw into that hole. |
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