ASME_B18.2.4.6M-2010


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ASME B18.2.4.6M-2010

Metric Heavy Hex Nuts
American Society of Mechanical Engineers / 31-Mar-2010 / 16 pages
FOREWORD
The B18 American National Standards Committee for the standardization of bolts, screws, nuts,
rivets, and similar fasteners was organized in March 1922, as Sectional Committee B18 under
the aegis of the American Engineering Standards Committee (later the American Standards
Association, then the United States of America Standards Institute, and as of October 6, 1969,
the American National Standards Institute, Inc.), with the Society of Automotive Engineers
and the American Society of Mechanical Engineers as joint sponsors. B18 Subcommittee 2 was
subsequently established and charged with the responsibility for technical content of standards
covering wrench head bolts and nuts.
At its meeting on December 4, 1974, the B18 Committee authorized preparation of a series of
standards for metric fasteners. Subcommittee 2 was assigned responsibility for developing standards
for metric hex bolts, screws, and nuts.
At a meeting on September 22, 1976, Subcommittee 2 organized the contents of a standard
covering six different styles of hex nuts. Actual drafting was postponed until ISO/TC2 could
reach final decisions relating to basic dimensions and characteristics of hex bolts, screws, and
nuts. At ISO/TC2 meetings held in April 1977, final actions were taken. The B18 Committee
affirmed the TC2 decisions at a metting on June 29, 1977, and drafting of this Standard was
started.

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