Metal Threading Services: The Ultimate Guide To Thread Machining

Metal Threading Services are an essential metalworking technique. Never should a manufacturer take thread machining for granted. Connectors and fittings are now available in a great variety on the worldwide market. Consequently, selecting the appropriate threads for your applications becomes more challenging.

Likewise, the thread-cutting techniques seem to have various flaws. However, these Metal Threading Services technologies are among the most effective methods for manufacturing screw threads. Investigating the different threading Metal Threading Services technologies for your profit margins is essential. Read on for crucial facts regarding threading machining.

What Does a Manufacturing Machining Thread Mean?

A thread consists of a continuous helical ridge. The helical ridge on the different surfaces of a cylinder or cone has a uniform cross-section. It may form on the exterior surface of an internal nut, screw, or bolt.

The main job of a thread is to couple two mechanisms together. When you consider the cap on your water bottle, a wonderful image of lines will come to mind. A tight water seal is created by coupling the cap and bottle top.

As a consequence of the connection, motion is transmitted. As a result, the action may contribute to mechanical benefits. You can comprehend machining threads better if you are familiar with the words below:

Crest: The top of the thread connecting the flanks. The thread section that extends the furthest from the cone or cylinder is called the crest. In other words, it is the highest thread.

Flank: The crest and root are joined by the side of a thread. The intersection of a flank surface with a plane is, theoretically, a straight line.

Root: The thread surface connecting the sides of neighbouring thread forms is known as the root. The thread’s projection is in the region just next to the cone or cylinder. In other words, it is the base of the threads.

Pitch: The spacing between equal portions on neighbouring threads measured for a parallel area. The diameter of the hypothetical cone or cylinder is known as the pitch diameter.

Helix Angle: When a thread is straight, the helix’s angle with the thread axis is known as the helix angle. On the other hand, the conical spiral area of a thread creates the helix angle for a taper thread.

Machining Thread Types

There are many methods for categorising threads. Spaced threads and machine screw threads are often utilised on fasteners. Conversely, the unified screw thread system has established categories for UNC (coarse) and UNF (fine) threads.

We’ll talk about the internal and external threads in this part.

Internal Threads

A screw thread on a concave surface is referred to as an internal (female) machining thread. A single-lip threading tool is used to create these specific sorts of threads. The conventional threading tap is used for specific internal threads. A tap is a metal tool for cutting internal threads on CNC machined items.

To screw into your workpiece, you need an internal thread. Internal threads may be threaded by manual tapping or mechanical tapping. The following equipment is required to cut an internal thread:

  • Twist drill
  • Countersink 900
  • Internal spout
  • Flexible tap wrench (for hand taps)
  • Box column drilling or hand drilling (for machine taps)
  • Security glasses

You must first ascertain the required hole’s diameter. Secondly, it’s crucial to understand which tap to use for cutting. Based on their nominal diameters, internal machining taps are divided into categories.

External Threads

A screw thread is another name for an external thread. Among the frequently used external threads are bolts, studs, screws, and plug gauges. An external thread may run the whole length of pieces that are eligible for turning.

Threading on a lathe is highly effective for external threads. A circular die may be used for hand cutting as well. A fixed die stock typically contains the die. As an internal thread’s counterpart, manufacturers use circular dies.

Additionally, there are hexagonal square dies. The ideal use for these dies is interlocked. They assist with instances that need repair and with transporting bodies to inhospitable places. You may cut an external thread with the use of the following tools:

  • Round rod and die
  • File
  • Die stock
  • Vise (clamping) (for clamping)
  • Screws with a flat point
  • Cutting spray (for surface quality)

The circular rod’s edges must first be filed. Then, at 450, chamfer the rod. The chamfer should be a little bit larger than the thread’s depth. The circular die may then be securely fixed using a clamp. To cut the thread, the rod has to be under a lot of pressure. Cutting sprays enhance the surface quality of the component while also increasing its lifespan.

Tips on Thread Machining Design

Given the many advantages, knowing how to cut threads or hot bending steel is not sufficient. Additionally, it is essential to understand the optimal applications of metal threading services. Here are some design recommendations for threading applications.

  • Internal threads should have a countersink at their conclusion.
  • If there are no standards, lower-height threads are preferred over higher ones.
  • Utilising conventional thread sizes and shapes is more cost-effective.
  • The beginning of the thread must have a smooth surface parallel to the thread’s central axis.
  • To endure the pressure of shaping or cutting, the tubular sections need greater wall thickness.
  • The external thread ends of components should be chamfered.


Producing high-quality components demands a comprehensive grasp of production processes. The provision of metal threading services is a vital component of production operations. Despite the idea’s seeming complexity, it is not recommended to discard it.