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AASHTO to ASTM Conversions
 
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 state highway projects. Many of these designations can be directly converted to an ASTM equivalent. These are some of the more common fastener related specifications and their ASTM equivalents.
AASHTO Grade ASTM Equivalent Description
M-111 A123 Hot-dip galvanizing of iron 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

 

 
 
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