Screw taps for UNC threads according to ANSI B1.1

UNC – American Coarse Thread

Although the UNC thread is primarily used outside of Europe, you will occasionally encounter it here as well. It’s even better if you not only know what type of thread it is but also where to find the right tools for it. At BAER, you’ll find taps and accessories for the UNC standard thread, as well as many other national and international norms. Tools for specific sizes such as UNC 1/2, UNC 1/4, UNC 2, UNC 3/8 and UNC 5/16 are also available.

Everything you need to know about the American Unified Coarse Thread

The UNC thread originates from the United States and belongs to the Unified National thread family (UN). It is a coarse thread frequently used for fastening screws and represents the standard for connections between two components. The UNC thread is standardized according to ANSI/ASME B1.1. UNC stands for Unified National Coarse Thread. Previously, it was also known as NC. The coarse thread family also includes the fine threads UNF and UNEF. The flank angle of the UNC thread is 60°.

The UNC thread is widely used in the USA and in countries such as Australia and Japan. In Germany, its role is more indirect. When importing products from abroad, you may encounter UNC screws—particularly in technical fields such as PC housings or camera equipment.

The UNC thread is an inch-based thread, which is the key difference compared to metric threads. All measurements, such as the outer diameter, are given in inches, and the thread pitch is defined by the number of threads per inch. To work correctly with UNC threads, you should be able to convert metric dimensions into inch values. One inch equals 2.54 cm.

Despite similar applications and the same flank angle, UNC and metric M threads are not interchangeable. Screws and nuts of the two systems are not compatible. Never attempt to screw a UNC bolt into a metric internal thread or vice versa—you risk damaging the components.

To navigate UNC thread tables, it’s important to understand the naming convention: nominal diameter – pitch – abbreviation UNC. The nominal diameter refers to the external diameter in inches, while the pitch is given by the number of threads per inch. Examples: 1/4″–20 UNC, 5/8″–11 UNC, 1″–8 UNC or 1 1/8″–7 UNC. Threads with a nominal diameter smaller than 1/4 inch follow different numbering rules, using a fixed number instead of a diameter—for example: No. 1–64 UNC, #1–64 UNC, or N 1–64 UNC.

UNC Threads – Our Range

In our online shop you’ll find UNC taps and accessories at attractive unit prices. Thanks to our extensive stock, we can offer high availability across all categories.

Taps for UNC Threads

We offer UNC taps in all sizes and types – hand taps, machine taps, and spiral-point taps. All tools are made from high-quality high-speed steel and carefully manufactured. Whether for blind or through holes, right- or left-hand threads, or for materials such as steel and stainless steel – BAER has the right solution.

Dies for UNC Threads

Not only internal but also external threads can be produced easily with BAER tools. Our UNC dies are available in round form for standard applications, left-hand threads, and for stainless steel. For repairs or tight spaces, our hexagonal die nuts are particularly suitable, as they can be used easily with an open-end wrench.

Thread Gauges for UNC Threads

To check your work, use our UNC gauges. Plug gauges test internal threads, while ring gauges check external threads – quickly and reliably.

Thread Cutting Sets for UNC Threads

Our UNC thread cutting sets are ideal for beginners as well as for professionals who need an all-in-one solution. Each set contains all the essential tools – everything you need, with just one click in your cart.

Discover tools and accessories for UNC threads in the BAER Online Shop!

Do you have questions or need further information about our products? Our customer service team is always available – by phone or conveniently via our contact form. We look forward to hearing from you!