2.2
BOLTS, NUTS, AND WASHERS
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NOTE: Commonly used bolts, nuts, and washers are
listed under the applicable type of steel using the
same terminology specified in "Steel" paragraph.
Verify material selection with the designer and
modify if required.
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NOTE: Designs requiring notch strength or
installation and operation at low temperatures will
require special material selections. Notch strength
will be required based on design geometry or for
dynamically loaded structures. When notch toughness
is required, the supplementary requirements of the
ASTM specification for the steel being considered
should be reviewed and the appropriate supplementary
requirements (ASTM A 6) specified. In designs where
the material will be exposed to temperatures below
freezing, the material type should be checked
against the proposed ambient and working
temperatures for resistance to brittle fracture.
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Provide the following unless indicated otherwise.
2.2.1
Structural Steel [, Steel Pipe]
2.2.1.1
Bolts
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NOTE: Do not galvanize ASTM A 490 bolts. When
galvanizing ASTM A 325 bolts limit hardness of bolts
to Rockwell C-32.
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NOTE: Do not mix bolt material specifications ASTM
A 325M and ASTM A 490M ASTM A 325 and ASTM A 490 on
the same diameter bolts in high strength
connections. Do not place ASTM A 325M and ASTM A
490M ASTM A 325 and ASTM A 490 bolts, which have a
hardness equal to or in excess of Rockwell C-32, in
contact with a galvanized surface. The ASTM A 325M
and ASTM A 490M ASTM A 325 and ASTM A 490 bolts
specified are for a maximum diameter of M36 1.5
inches. If larger bolts are required, include the
following ASTM publications in reference article:
ASTM A 354 - Quenched and Tempered Alloy Steel
Bolts, Studs, and Other Externally Threaded Fasteners
ASTM A 449 - Quenched and Tempered Steel Bolts and
Studs.
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SECTION 05120
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