Unified Fine Thread
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UNC and UNF are symbols of Unified Screw Thread Series
The Unified Thread Series was agreed on by the United States, Great Britain and Canada in 1949 to obtain interchangeability. Recently, modifications have been made to the original 1949 specifications for ease of use.
The Unified Thread Series is classified into coarse threads, fine threads and extra fine threads much like Metric screw threads are.
UNC: Is the symbol for Unified coarse pitch threads.
UNF: Is the symbol for Unified fine pitch threads.
We retain all orders placed on a back order system when the item is not available at time of ordering. These will be dispatched when fresh supplies become available unless otherwise instructed. If the particular item becomes NLA (No Longer Available) or is unlikely to become available within a few months we will cancel the back order and refund any funds paid via Paypal. – Your credit card will NOT be charged for any back ordered items. - Please see our full terms and conditions.