Thread milling v tapping: the pros and cons

Precision machining plays a crucial role in numerous industries that require threads in critical components. The two main techniques for threading are tapping and thread milling.

What is tapping?

Tapping involves using a screw-like cutting tool – the tap – to create internal threads. Tapping can be done manually or by machine.

Pros and cons of tapping

The main advantages of tapping are that it is quick, simple, and suitable for dealing with high volumes. It is also a cost-effective option and efficient for soft materials such as brass and aluminium. The main disadvantages of tapping are that it is less reliable than other techniques when used on extremely hard materials, it is restrictive in terms of thread size and type, it may need several tools for each thread specification, and the thread quality and accuracy are lower than with some other methods.

Tapping machines experts

There are a number of firms that specialise in the manufacture of tapping machines and other similar equipment. One of the most well-known brands is Roscamat. Roscamat tapping machines are regarded as amongst the best on the market.

If you need advice or information about tapping machines, there are a number of companies with expertise in this field, such as Cotswold Machinery Sales.

What is thread milling?

A more modern method of machining that has gained popularity in the last few decades, thread milling uses a specialist rotating cutting tool.

Pros and cons of thread milling

The main advantages of the thread milling technique are flexibility, short setup times, superior thread quality, superior precision, reduced risk of tool breakage, the ability to thread harder materials, and the ability to repair damaged threads.

The main disadvantages are the high initial costs of the required CNC machines and specialist tools, programming complexity, slower speeds for smaller threads, and issues with chip evacuation.

How to choose

The choice of whether to use thread milling or tapping is usually based on several key factors, including the material type, volume of output, and the specific application.