A394-04 - Standard Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare
Description:
This specification covers the chemical and mechanical requirements of hexagon
and square-head zinc-coated steel bolts and atmospheric corrosion-resistant
bolts, in nominal thread diameters of 1/2, 5/8, 3/4, 7/8 and 1 in. for use in
the construction of transmission towers, substations, and similar steel
structures. The various types of bolts covered in this specification are:
Type 0 ? Zinc-coated bolts made of low or medium carbon steel.
Type 1 ? Zinc-coated bolts made of medium carbon steel, quenched and
tempered.
Type 2 ? Zinc-coated bolts made from what is generally described as
low-carbon martensite steel, quenched and tempered.
Type 3 ? Bare (uncoated), quenched and tempered bolts made of steel having
atmospheric corrosion-resistance and weathering characteristics comparable to
that of the steel covered in Specifications A 242/A 242M, A 588/A 588M, 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 5.4). When properly exposed to the atmosphere, these steels can be used
bare (uncoated) for many applications.
Category: ASTM International Standards Specifications
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