** COVID-19 **
Following UK government guidelines our premises are closed to all visitors with immediate effect. We will continue to operate a mail order service with volunteer staff and will do our best to service your order as efficiently as possible at this difficult time.
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.