Spring washers ANSI B18.21.1

Buy UNC/UNF inch thread nuts, screws and washers now!

The Unified National Coarse (UNC) and Unified National Fine (UNF) inch threads are widely used standards for threads in the United States. These thread systems play a crucial role in various applications. 

UNC/UNF inch threads are standardized threads

UNC threads are coarse inch threads used for general applications. They feature a low number of threads per inch, resulting in faster screwing and unscrewing. This makes them particularly suitable for applications where quick assembly and disassembly is required. Examples of UNC thread applications include structural bolts in building construction or general fasteners.

On the other hand, there are UNF threads, which are considered fine threads. They have a higher number of threads per inch compared to UNC threads. This results in a finer resolution of the thread, which contributes to greater load capacity and strength. UNF threads are often preferred in applications where a more precise fit and higher load capacity are required, such as screws in engines or precision tools.

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