Machine Screws

What are Machine Screws?

Machine Screws are distinguished from other screws by the use of machine threads. A machine thread on a screw is a non-tapered thread, with a flat tip, which is designed for use with pre-tapped holes. Machine screws are common in particularly hard metal housings, where pre-tapped holes must be used, as self-tapping screws can be impractical for cutting into such hard material.

Metric Machine Threads

Metric machine threads follow the manufacturing standard ISO 68-1, which defined by a 60 degree thread profile, and is divided into denominations commonly known as M Sizes. Metric machine threads are relatively easy to understand - their size, (E.g. M12) correlates to their nominal diameter in millimetres (12mm).

Imperial Machine Threads

Imperial machine threads follow the UTS manufacturing standard. This standard has the same 60 degree thread profile as ISO 68-1, but is characterised by its use of imperial measurements rather than metric.


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