Metric Thread And UNC/UNF Imperial Thread


A helical or spiral ridge on a titanium bolt, titanium screw, or titanium nut. Specifically, (Mechanical Engineering) a helical groove in a cylindrical hole (female thread), formed by a tap or lathe tool, or a helical ridge on a cylindrical titanium bar, titanium rod, etc (male thread), formed by a die or lathe tool.

Here are two kinds of common thread of titanium fasteners.


Metric Thread

The standard metric thread is recognizable by its cylindrical outer and inner diameter in millimeters.There are three kinds of metric threads: coarse thread; fine thread; extra fine thread.



UNC / UNF Imperial Thread

Thread series are measured by the number of threads per inch applied to a single diameter.


Coarse Thread Series (UNC) is the most common designation for general application bolts and nuts. Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in adverse conditions and facilitate quick assembly.


Fine Thread Series (UNF) is commonly used in precision applications. Because of the larger tensile stress areas, they have high tension strength. However, a longer engagement is required for fine thread applications than for coarse series threads to prevent stripping.



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