phillips machine screw, UNC and UNF represents what?

What do they stand when you see UNC and UNF letters on the phillips machine screw drawing? If you need to produce a component with 1/4″ -20UNC and 1/4″ -28UN threads. Do you know what UNC and UNF stand for? The Shi Shi Tong Screw Factory is here to tell you.

phillips machine screw, UNC and UNF are the hallmarks of the American thread series.

In 1949, the United States, the United Kingdom, and Canada agreed to use the unified threading series to achieve interchangeability. Recently, the original specification of 1949 was revised to facilitate its use.

The unified thread series is divided into coarse thread, fine thread, extra fine thread and extra fine thread, which is very similar to metric thread.

UNC: is the symbol for uniform coarse thread.

UNF: is the symbol of uniform fine thread.

UNEF: is the symbol of a uniform superfine pitch thread.

UNS: is the symbol for a unified dedicated thread.

If a uniform thread series is used, it is easy to distinguish the large diameter of the thread, per inch of thread (TPI), and it is a UNC coarse pitch thread. Metric phillips machine screw threads are commonly used in China. Metric threads are usually described in metric threads only by using the listed outer diameter of the threads. The specifications need to be carefully checked to determine if the threads are coarse or fine.

Whether phillips machine screw it is American thread or inch thread or metric thread, Shi Shi Tong screw factory can produce, welcome to inquiry.

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