The acronym AASHTO stands for American Association of State Highway Transportation Officials. The AASHTO MM314 specification covers anchor bolts designed to anchor structural supports to concrete foundations. M314 anchor bolts can take the form of either headed bolts, straight rods, or bent anchor bolts. The three grades 36, 55, and 105 designate the minimum yield strength (ksi) of the anchor bolt. This standard is identical to ASTM F1554.