1970AASHTO M 253-2005 Standard Specification for Structural Bolts, Alloy Steel, Heat-Treated, 150 ksi Minimum Tensile Strength
0000 AASHTO M 253-2003
2002AASHTO M 253-2002 Standard Specification for Heat-Treated Steel Structural Bolts, 150 ksi Minimum Tensile Strength HM-22; PART IA; ASTM Designation: A 490-00