ASTM A 394 - 07 Standard Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare

American Society for Testing and Materials (ASTM). Current edition approved Aug. 1, 2007. Published August 2007. Originally approved in 1955. Last previous edition approved in 2005 as A 394 – 05. 6 p. 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.