The tools that are used for threading or for creating a screw thread is what we refer to as the dies and tap and the processing in which these are done is called the tapping process. The trapezoidal thread tap is the metric equivalent of the Acme taps but it just differs slightly with the presence of a 30-degree angle. Specialized engineering process and designs are usually employed to manufacture this tool due to the nature of the cut and the severity. They can be said to be a screw thread profile with trapezoidal outlines. These trapezoidal thread taps are the most common forms used for the work screws that is screws used for heavy loads.

An original trapezoidal thread tap has an angle degree of 30 degrees. You would found these tools where large loads are typically required such as the lead screw of a lath. They are defined by the ISO standards as 60 for the nominal diameter in the value of millimeters, 9 as the pitch in millimeters also. The ISO went further to define the trapezoidal thread tap as a single start thread and the non-single start thread. The single start thread is said to be the one with no suffix while the latter is that which a suffix. In the case of the presence of a suffix, the value of the multiplication sign would be the lead while the value for the parentheses would be the pitch.

The trapezoidal thread taps were designed to replace the square threads and other variety of threads with other forms used mainly for the purpose of transferring on a machine or a tool. However, its uses have now extended beyond its original purpose of design. It is used in press, jacks, valves or other mechanisms that move heavy loads because they offer high strength and ease off the process of production. The standardization of the trapezoidal thread tap includes the multiple start threads, the left-hand threads, and the self-centering threads that are less likely to bind under any lateral force.

The advantages of the trapezoidal thread taps over the comparably sized square thread have made it popular in the world of machinery. Their advantages include the following:

• Strength: The trapezoidal thread tap is stronger than the square thread. This is the more reason it is being employed in heavy loads.
• Easy to cut; the shape of the square thread requires a tool bit or a die tooth geometry that is poorly suited to cutting. This is what is absent in the trapezoidal thread tap thus making it easy to be cut either with the single point threading or the die.
• Wears: In terms of wears, the trapezoidal thread tap wears better than a squatted thread because the wear of the former can always be compensated for.
• Smoothness; There is a smoother engagement of the half nuts on a lathe lead screw than the square screw thread resulting in a better efficient result.