Historical
ASTM A490-02
Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength
This specification covers the chemical and mechanical requirements of heat-treated steel bolts, 1/2 to 1 1/2 in., incl, in diameter. These bolts are intended for use in structural joints that are made under the Specification for Structural Joints Using ASTM A325 or A490 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 1/2 to 1 1/2 in., inclusive, in diameter. 1.1.2 Type 2- Bolts made from what is generally described as low-carbon martensite steel, supplied in sizes 1/2 to 1 in., inclusive, in diameter. 1.1.3 Type 3- Bolts 1/2 to 1 1/2 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: Bolt Type and Finish Nut Class and Finish 1 and 2, plain (noncoated) A 563 - DH, DH3, plain A 194 - 2H, plain 3, plain A 563 - DH3, plain 1.5 Unless otherwise specified, all washers used on these bolts shall conform to the requirements of Specification F436 and shall be of a surface finish for each type of bolt as follows: Bolt Type and Finish Washer Finish 1 and 2, plain (uncoated) plain (uncoated) 3, plain weathering steel, plain 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 1/2 in., but with similar mechanical properties, refer to Grade BD of Specification A354. Note 2-A complete metric companion to Specification A490 has been developed-Specification A490M; therefore no metric equivalents are presented in this specification.
ASTM International [astm]