Clay, Here are a couple of links to the bolts in question and specified by NTCOG. Just to let you know the difference. onsite http://www.portlandbolt.com/technicalinformation/astm/ASTM_A307.html?gclid=CP7_j6PbpqYCFUHr7QodzHZSZg Specified by NTCOG http://www.portlandbolt.com/technicalinformation/astm/ASTM_A325.html Thanks Wade Geistweidt Engineering Tech 2035 Central Circle Suite 110 McKinney, TX 75069 o| 972.562.4677 c| 469.576.9951 f | 972.542.4366