Standard Specification for Heat-Treated Steel Structural Bolts, 150 ksi Minimum Tensile Strength
|Publication Date:||10 May 1997|
1. Scope *
1.1 This specification covers the chemical and mechanical requirements of heat-treated steel bolts, ½ to 1 ½ in., incl, in diameter. These bolts are intended for use in structural joints that are made under the Specification for Structural Joints Using ASTM A 325 or A 490 Bolts issued by the Research Council on Structural Connections of the Engineering Foundation. The various types of bolts covered by this specification are:
1.1.1 Type 1--Bolts made of alloy steel, supplied in sizes ½ to 1 ½ in., inclusive, in diameter.
1.1.2 Type 2--Bolts made from what is generally described as low-carbon martensite steel, supplied in sizes ½ to 1 in., inclusive, in diameter.
1.1.3 Type 3--Bolts ½ to 1 ½ in., inclusive, in diameter having atmospheric corrosion resistance and weathering characteristics comparable to that of the steels covered in Specifications A 588/A 588M, A 242/A 242M, and A 709/A 709M. The atmospheric corrosion resistance of these steels is substantially better than that of carbon steel with or without copper addition. See 6.3. When properly exposed to the atmosphere, these steels can be used bare (uncoated) for many applications.
1.2 The purchaser should specify either Type 1, 2, or 3 bolts. When the bolt type is not specified, Type 1, 2, or 3 may be furnished at the option of the manufacturer.
1.3 When atmospheric corrosion resistance and weathering characteristics are required, Type 3 bolts should be specified by the purchaser.
1.4 Unless otherwise specified, all nuts used on these bolts shall conform to the requirements of Specification A 194/A 194M or A 563, shall be heavy hex, and shall be of the class and surface finish for each type of bolt as follows:
1.5 Unless otherwise specified, all washers used on these bolts shall conform to the requirements of Specification F 436 and shall be of a surface finish for each type of bolt as follows:
1.6 This specification provides that heavy hex structural bolts shall be furnished unless other dimensional requirements are stipulated in the purchase inquiry and order.
NOTE 1--For quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners with diameters greater than 1 ½ in., but with similar mechanical properties, refer to Grade BD of Specification A 354.
NOTE 2--A complete metric companion to Specification A 490 has been developed--Specifica