The American Industrial Fasteners Association announces the publication of a new IFI standard (IFI-171) for bolt, stud, and nut assembly for the steel construction industry in sizes 1-5/8 - 5-1/2 and 1-7 /8 UNS thread size.
 
The new standard clearly defines thread specifications and tolerances for two coarse pitch sizes commonly used in the steel construction industry, 1-5/8—5-1/2 and 1-7/8-5. The new standard addresses minor discrepancies that often arise from different interpretations of ASME B1.1 (2019) where dimensions are not explicitly listed.
 
IFI Standards are developed by voluntary industry experts at the request of IFI members and industry stakeholders. Many of these experts have also assisted in the compilation of the IFI Fastener Standard Book, a comprehensive collection of nearly 100 ASTM, ASME, SAE, and IFl standards.