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How Threads are Made

How Threads are Made

Knapp Fasteners Inc.

2 min read
Threads are an essential feature of fasteners, enabling them to create secure and reliable connections. While threads may appear similar, the methods used to create them—cutting, rolling, and forming—play a vital role in their strength, precision, and cost. In this article, we’ll explore the differences between these threading methods, their uses, and address common questions.

Thread Cutting

This is a subtractive process that removes material to create threads, typically using a die or lathe. It’s often used in specialized applications requiring unique thread sizes and custom fasteners.
  • Key Features:
    • Produces precise threads with sharp, well-defined edges.
    • Ideal for low-volume production or custom fasteners.
    • Suitable for hard or brittle materials, such as hardened steel, that cannot deform under pressure.

Thread Rolling

This is a cold-forming process where threads are created by pressing and deforming material between rolling dies. This method displaces material rather than removing it. It’s used in industries such as automotive, aerospace, and construction where strength is essential. It’s also used in high-volume production runs so it’s more cost efficient.
  • Key Features:
    • Threads are stronger due to the work hardening of the material.
    • Produces a smooth surface finish with minimal stress points.
    • Ideal for mass production due to its speed and efficiency, with less material waste

Thread Forming

Threads are created by displacing material inside an untapped hole rather than cutting it. Like rolling, this method does not remove material. It’s popular in industries like electronics and appliances where threads are needed in softer or thinner materials.
  • Key Features:
    • Produces durable threads with excellent vibration resistance.
    • A clean process that generates no chips or debris.
    • Works best with ductile materials, such as aluminum or plastics.

Considerations for Bulk Purchasing

Many of these types of screws are purchased in bulk quantities for manufacturing and assembly. Bulk purchasing not only lowers costs but ensures a consistent supply for large-scale projects. However, prices can vary based on factors such as thread type, material, and size. We can provide some types in smaller quantities. Always feel free to reach out to our sales team if you require a quote. A lot of these screws types fall within SIMA tariffs which result in higher prices. We do our best to maintain low pricing and will work with you to find the best option.

Choosing the Right Type

Selecting the appropriate threading method depends on several factors, including:
  • Material type: Hard materials are better suited for thread cutting, while softer materials excel with rolling or forming.
  • Production volume: Thread rolling is cost-effective for high-volume production, while thread cutting is more practical for low-volume or custom needs.
  • Strength and vibration resistance: Thread forming screws are ideal for creating durable internal threads in vibration-sensitive applications.
At Knapp, we stock a wide variety of thread cutting screws and can provide bulk quotes tailored to your needs. Whether you’re looking for standard or specialty fasteners, we’re here to help. Contact us today for pricing!