About Thread In Machining Manufacturing

DALIAN, China - Aug. 2, 2021 - PRLog -- What Is A Thread in Engineering And Manufacturing?

A thread is a continuous spiral ridge with a uniform cross-section formed on the inner (nut) or outer (screw or bolt) surface of a cylinder or cone. The profile of the thread consists of the crest (the top of the thread), the root (the bottom of the thread) and the flank (connecting the crest and the root).

Thread refers to a continuous spiral ridge. The spiral ridge has a uniform cross-section on the different surfaces of the cylinder or cone. It can be formed on the surface of the nut (inside) or screw/bolt (outside).

The main function of the thread is to act as a coupling between the two mechanisms. When you think of your water bottle cap, you get a nice picture of the thread. The cap and cap are combined to form a tight water seal.

Thread Type:

According to different classification standards, there are many types of threads. Machine threads and spacing threads are commonly used for fasteners. UNF (fine) thread and UNC (coarse) thread are the standard series in the unified thread system.

UNC (Coarse Thread): 20 threads per inch (tpi)

UNF (fine pitch): 28 tpi

UNEF (Ultra Fine Pitch): 32 tpi

Here we talk about internal threads and external threads.

Internal Thread

Internally machined threads are threads on the inner surface or concave surface. These types of threads are machined with single-lip thread cutters. Some internal threads use traditional thread taps. The tap is a metal tool used to cut internal threads on CNC machined parts.

External Thread

External threads are also called threads, which are threads on the outside of a cone or cylinder. Common external threads include screws, plug gauges, bolts or studs. For parts that meet the turning conditions, the external thread can extend through the length of the part.
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