Basic effective dia (inches), Basic minor dia of ext. Unified threads comes in three different classes: for applications where a liberal tolerance is required to permit easy assembly even with slightly nicked threads. Bufret Lignende Oversett denne siden U. The old definition NC – National Coarse is comparable with the metric thread.
The new term UNC is comparable with the ISO metric thread. NC and UNC threads are interchangeable, in an similar manner to the metric and the ISO metric thread.
Diameter Inch, Major Diameter mm, Tapping Drill Size mm, TPI, Pitch mm. The pitch of a screw is defined by the angle of its threads – a coarse pitch will have a more obtuse thread. Tolerance classes of 1A, . UNEF: Is the symbol for United extra fine pitch threads.
UNS: Is the symbol for Unified special threads. The threads per inch come directly after the thread diameter and before the length (if applicable) when describing an inch fastener. Thread pitch chart for standard.
Reference Table Nomenclature, are used. Coarse thread is beneficial, because they are less .