Precisely, screw threads are used in a wide range of applications in many industries. Nuts and bolts, machine screws, plastic screws and wood screws are used as fasteners. Screw threads are also used for connecting thread pipes and hoses to each other as well as to caps and fixtures.

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Basically, Screw threads have an increased number of threads per inch. This decreases the linear screw motion per turn compared to ACME, Square and Buttress threads. The screw threads also have an increased shaft diameter which increases the delivery strength. There are three variations in which screw threads are presented: they are coarse, fine and extra-fine variations.

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The Nomnal Diameter is measured in Inch Fraction. The diameters that are ¼” and above are measured in inch fractions. For instance, ¼”, ¾” or 1 ¼”. The diameters that are below ¼” are given with a series of numbers that range from #0 to #12. Every number is assigned to a single arbitrary diameter.

Unified Screw threads have their own manufacturing process similar to other screw threads like ACME, Square and Buttress threads. The screw threads give a far more favorable touch in some instances which enhances its usage against the rest of them. The screw is basically a ridge wrapped around a cylinder or a cone, which is in the form of a helix. The two matched pair of threads that are external and internal are described as males and females. A screw that contains threads on the surface is considered as male and the screws that have threads on the internal surface are considered as female.

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Most of the time, the series of UST would be UNC (coarse pitch), UNF (fine pitch) or UNEF (extra fine pitch).  The ASTM B1.1 also has given definitions for several constant pitch series. These are identified by

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Screw threads are also used for the below functions. When all of these applications are considered, the screw thread has two main functions. They are:

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The main advantage of using unified screw threads is that the increased number of threads per inch allows an increased linear force at the same amount of torque when square, ACME or buttress threads are compared.

Currently, the UTS is under the control of ASME/ANSI of the United States. UTS is used as the main standard for bolts, nuts and various other fasteners used here. Although it contains the same profile as the ISO MTS, the difference is that its basic dimensions are chosen to be an inch fraction rather than a millimetre value.

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The unified screw thread is used in various applications. It has become prominent in a number of industries as well as domestic usage due to its ease of use. Three main basic applications can be identified for screw threads:

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Instead of using fractions, diameters may also be indicated using the relevant decimal value. For instance, instead of ¼”, 0.250 and instead of 7/16”, 0.4375 can be used. The diameter that is described by each ‘number’ from #0 to #12 is given in the below table.

The class is defined using a code with two characters. The first character contains a digit between 1 and 3. The designations are 1 = Tight fit, 2 = Medium Fit and 3 = Loose Fit. The second character is a letter from the English alphabet. According to his, A = External thread and B = Internal thread.

The Pitch is given in TPI. For instance, a ¼-20 is in fact a thread with a pitch of 20 TPI. Instead of this, the pitch can also be denoted using distance. In this method, ¼-0.05P is a thread with a pitch of 0.05” which is equivalent to 20 TPI.

The size chart is calibrated based on the major diameter, threads per inch, tap drill size and the pitch of the screw thread. The below-given chart can be used to choose the right unified screw thread that you will need for your task.

After considering all the given designations, it is clear that there is a wide range of screw threads to choose from. This is especially important when we choose the right type of screw thread based on the purpose, we need to use them. The size chart that is used to identify the screw threads based on the relevant applications is given below.

-UN. For instance, the 12-UN or 8-UN remains the same for the complete diameter range within this series. Although this method is in use, it is very rare.

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