ITM H-3
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29 terms
Terms | Definitions |
|---|---|
 Diameter | The distance across the center of a hole or shaft. |
| Radius | Half the diameter. |
| Concentric | Two or more diameters that share the same center. |
| Counterbore | A drilled hole with a concentric larger hole to allow for the head of a screw or bolt to sit flush with the top surface. |
| Spotface | a shallow counterbore that is used when the surface on which the head of a bolt or a nut is seated, is rough, concave, or convex. |
| Countersink | A drilled hole with a concentric conical (cone shape) that will allow a machine or metal screw to sit flush with the top surface. |
| Perpendicular | Two surfaces square or at 90 degrees to one another. |
| Angular | Two surfaces that are inclined (angled) to each other at any angle other than 90 or 180 degrees. |
| Parallel | Two surfaces equal distance from each other at all points. |
| Basic Dimension | A theoretically exact dimension. Basic Dimensions are used to describe the theoretically exact size, profile, orientation or location or a feature or datum target point, line, or area. |
| Tolerance | The specified amount that a feature is allowed to vary from the nominal size. |
| Feature | The specific portion of an object to which dimensions and tolerances are applied. |
| Feature | The specified portion of an object to which dimensions and tolerances are applied. |
| Nominal | The stated size of a feature or object before applying tolerances. |
| Allowance | The intentional difference in size between mating parts. |
| Clearance | Half the allowance. |
| Spherical | An object that is completely round and equal distance from the center at all points. |
| Linear | Straight line distance between two points, lines, or surfaces. Beginning at a reference point and ending at a measured point. |
| Size Dimension | Any dimension that gives the overall size of a part or part feature. |
| Location Dimension | Any dimension that locates a feature to another feature to the part edge. |
| ASME | the American Society of Mechanical Engineers |
| ISO | the International Organization for Standardization |
| Center Lines | _____ are used to indicate the center of a circle or part or a circle, and also to show that a part is symmetrical about a line. |
| Hidden Lines | _____ represent all the edges that are invisible to the observer because they are covered by other portions of the object. |
| Object Lines | _____ show the outline or shape of the object. |
| Projection Lines | _____ establish the relationship of lines and surfaces in one view with corresponding points in other views. |
| Extension Lines | _____ are used in dimensioning to show the size of an object or feature. |
| Dimension Lines | _____ indicate the exact distance referred to by a dimension placed at the break of a line, and are represented by arrowheads. |
| Leader Lines | _____ are thin lines used to connect a specific note to a feature and are usually drawn at a 45 degree angle with a short shoulder, centered where it meets the note in an arrow. |
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