Understanding Thread Notes - PLTW Engineering Classes
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Understanding Thread Notes
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|Nominal Size of Threads |External diameter of the threads. |
|Threads Per Inch |Number of threads contained in one inch. |
|Type of Thread |UNC - Unified Course thread (most common) |
| |UNF – Unified Fine thread |
| |UNEF – Unified Extra Fine thread |
|Class of Thread |Accuracy of manufacture. |
| |1 is least accurate. |
| |2 and 3 are more accurate and most common. |
|Internal / External Threads |A indicates internal threads. |
| |B indicates external threads. |
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|Metric |Indicates that it is a metric thread. |
|Major Diameter |External diameter of the threads in millimeters. |
|Pitch |Pitch distance in millimeters. |
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