Extrusion Terminology
| Standard shape | Extrusions available to all customers. |
| Exclusive shape | Extrusions manufactured to client design and produced for their exclusive use. These are not published in our catalogue. |
| Standard | Alloys, tempers, dimensions and services always available and acceptable without further reference. |
| Non-standard | Alloys, tempers, dimensions and services which are outside normal availability and always the subject of special inquiry. |
| Section drawings | Profile outline drawings prepared for every extruded shape. Each one is identified by a die number (e.g. UA 1234) |
| Visible Face | In a finished construction, the visible surface of any extrusion. |
| External periphery | The measurement used in computing the price for surface finishes on hollow shapes in which the external perimeter only is measured, and the internal void excluded. |
| Total periphery | The total distance around the extruded shape, including internal void surfaces. |
| Factor | Result of dividing the total perimeter (internal and external for hollow shapes) of the section in millimetres by weight in kg/m. |
| Circumscribing circle | Minimum circle inside which the extruded shapes fit precisely. |
| Thickness ratio | Optimum desirable ratio of variation of metal thickness in any extruded shape. |
| Rod | Solid round section, 10 mm or greater in diameter whose length is great in relation to its diameter. |
| Bar | Solid section, long in relation to its cross-sectional dimensions, with a symmetrical square, rectangular, hexagonal, or octagonal cross-section (excluding flattened wire) with sharp or rounded corners or edges and whose width or greatest distance between parallel faces is 10 mm or greater. |
| Solid Shape | Extruded shape whose geometry does not form a void and which is long in relation to its cross-sectional dimensions. |
| Hollow Shape | Single enclosed void with a width to depth ratio of not less than 5:1. Wall thickness should be uniform except for radiused corners. |
| Semi-hollow Shape | Solid shape with a cross-section that partially encloses a void, in which the area of the void is substantially greater than the square of the width of the gap, otherwise classified as a hollow as follows. |
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