In an effort to support standardization this ASME B18 standard has been withdrawn in favor of the more widely used metric standard, DIN 580. B18.15.1M - 1998 (R2004) Inspection and Quality Assurance For General Purpose Fasteners Previous Edition: 1987 (R2006) Consolidated into B18.18 ASME-ANSI B18.2.2 Hex Nuts Dimensional Standards and Technical Specifications in Inch (Imperial) series ranging 1/4 upto 6 inch as per ASME and ANSI specifications. Metric System & Specifications • ANSI/ASME B18.2.3.1M Although the various standards may have different dimensional properties, products made to these The metric screw thread is identified by the capital letter M, followed by the nominal diameter. Metric ASME B18.2.1-2012 Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series) Documents sold on the ANSI Standards Store are in electronic Adobe Acrobat PDF format, however some ISO and IEC standards are available from Amazon in hard ANSI/ASME B18.2.2-1987 Square and Hex Nuts (Inch Home About this portal Latest updates Print Save Email Resource detail Citations ANSI/ASME B18.2.2-1987 Square and Hex Nuts (Inch Series) View on Information Heavy Hex Nut Size Table Chart per. ASME B18.2.2. Hardware ANSI Menu. Heavy Hex Nut dimensions per ASME B18.2.2 1987 (1999). Heavy Hex Nut Width Across Flats . The width across flats of nut shall be the distance measured, perpendicular to the axis of nut, overall be tween two opposite sides of with ASME B18.18.2, a reference was made for the recommended B18 (PIN) for metric heavy hex nuts and was included in ASME B18.24, a workmanship reference to ASTM F 812/F 812M was added, Table 1 was enhanced to include symbols specifying geometric characteristics per ANSI/ASME B 18.2.2 UNC / UNF Hex nut, Hex thin nut, Jam nut and heavy hex nut dimension, size from 1/4 ASME procedures and policies, which precludes the issuance of interpretations by individuals. No part of th