AASHTO is an acronym for American Association of State Highway and Transportation Officials. It is common for bolt specifications to be called out on construction plans with an AASHTO designation for USA highway projects. Many of these designations can be directly converted to an ASTM equivalent.
| More common fastener related specifications and ASTM equivalents | |||||
|---|---|---|---|---|---|
| AASHTO Grade | ASTM Equivalent | Description | |||
| M-111 | A123 | Hot-dip galvanizing of iron and and steel products | |||
| M-164 | A325 | Structural bolt | |||
| M-183 | A36 | Raw material, low carbon steel | |||
| M-222 | A588 | Raw material, weathering steel | |||
| M-223 | A572 | Raw material, high strength low alloy | |||
| M-232 | A153 | Hot-dip galvanizing of fasteners | |||
| M-253 | A490 | Structural bolt | |||
| M-291 | A563 | Nut specification possessing many grades | |||
| M-292 | A194 | High strength, heavy hex nut | |||
| M-293 | F436 | Hardened washer | |||
| M-314 | F1554 | Anchor bolt specification with 3 grades | |||