Unified National Fine Thread Series (UNF)

Unfortunately, Portland Bolt cannot manufacture fasteners with Unified National Fine threads. UNF thread series bolts are typically used in precision applications, such as automotive or machinery. Our threading equipment is unable to hold the required thread tolerance for UNF. Also, unlike cold-drawn steel, the hot rolled round bar we use to manufacture construction fasteners does not lend itself to precise tolerances.

Portland Bolt manufactures fasteners starting at ½” diameter with Unified National Coarse Thread Series (UNC) or 8-Thread Series (8UN). Contact one of our estimators and we will be more than happy to assist.