Machinery's Handbook, 31st Edition
METRIC FASTENERS
1713
METRIC THREADED FASTENERS A number of American National Standards covering metric bolts, screws, nuts, and washers have been established in cooperation with the Department of Defense in such a way that they could be used by the government for procurement purposes. Extensive information concerning these metric fasteners is given in the following text and tables, but for additional manufacturing and acceptance specifications reference should be made to the respective Standards which may be obtained by nongovernmental agencies from the American National Standards Institute, 25 West 43rd Street, New York, NY 10036, www.ansi.org. These Standards are: ANSI/ASME B18.2.3.1M-1999 (Withdrawn) Metric Hex Cap Screws Table 1 ANSI/ASME B18.2.3.2M-2005 (Withdrawn) Metric Formed Hex Screws Table 2 ANSI/ASME B18.2.3.3M-2007 (R2014) Metric Heavy Hex Screws Table 3 ANSI/ASME B18.2.3.8M-1981 (Withdrawn) Metric Hex Lag Screws Table 5 ANSI/ASME B18.3.3M-1986 (Withdrawn) Metric Socket Hd. Shldr. Screws Table 6a ASME B18.2.3.9M-2001 (R2014) Metric Heavy Hex Flange Screws Table 7 ASME B18.2.3.4M-2001 (Withdrawn) Metric Hex Flange Screws Table 8 ANSI/ASME B18.5.2.2M-1982 Metric Round Head Square Neck Bolts Table 10 ANSI/ASME B18.2.3.6M-1979 (Withdrawn) Metric Heavy Hex Bolts Table 11 ANSI/ASME B18.2.6M-2012 Metric Fasteners for Use in Structural Applications Table 12 ASME B18.2.3.5M-1979 (R2016) Metric Hex Bolts Table 13 ANSI/ASME B18.3.1M-1986 (Withdrawn) Socket Head Cap Screws (Metric Series) Table 21 ANSI/ASME B18.2.6M-2012 Metric Fasteners for Use in Structural Applications (For section on Metric Hex Nuts, Style) Table 25 ANSI/ASME B18.2.6-2019 Metric Hex Nuts, Style 2 Table 25 ANSI/ASME B18.2.4.3M-1979 (R2017) Metric Slotted Hex Nuts Table 24 ANSI/ASME B18.2.4.4M-1982 (Withdrawn) Metric Hex Flange Nuts Table 26 ANSI/ASME B18.16M-2004 (R2016) Prevailing-Torque Type Steel Metric Hex Nuts and Hex Flange Nuts Table 29 ANSI/ASME B18.16M-2004 (R2016) Prevailing-Torque Type Steel Metric Hex Nuts and Hex Flange Nuts Table 27 ANSI/ASME B18.2.6-2019 Metric Hex Jam Nuts Table 28 ANSI/ASME B18.2.6M-2012 Metric Fasteners for Use in Structural Applications (For section on Metric Heavy Hex Nuts) Table 28 ANSI/ASME B18.22M-1981 (R2017) Metric Plain Washers Table 30 Manufacturers should be consulted concerning items and sizes in stock production. Comparison with ISO Standards.— American National Standards for metric bolts, screws and nuts have been coordinated to the extent possible with the comparable ISO Standards or proposed Standards. The dimensional differences between the ANSI and the comparable ISO Standards or proposed Standards are few, relatively minor, and none will affect the functional interchangeability of bolts, screws, and nuts manufactured to the requirements of either. Where no comparable ISO Standard had been developed, as was the case when the ANSI Standards for Metric Heavy Hex Screws, Metric Heavy Hex Bolts, and Metric Hex Lag Screws were adopted, nominal diameters, thread pitches, body diameters, widths across flats, head heights, thread lengths, thread dimensions, and nominal lengths are in accord with ISO Standards for related hex head screws and bolts. At the time of ANSI adoption (1982) there was no ISO Standard for round head square neck bolts. The following functional characteristics of hex head screws and bolts are in agreement between the respective ANSI Standard and the comparable ISO Standard or proposed Standard: diameters and thread pitches, body diameters, widths across flats (see exception below), bearing surface diameters (except for metric hex bolts), flange diameters (for metric hex flange screws), head heights, thread lengths, thread dimensions, and nominal lengths.
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