As we have discussed in earlier blogs, ASTM International produces over 12,000 standards for many different types of products globally. In relation to fasteners, the ASTM provides the standards for how they are made, what raw materials can be used to make them, and what testing methods must be performed prior to installation.

The American Association of State Highway and Transportation Officials (AASHTO) is a nonpartisan association representing highway and transportation departments in the United States. AASHTO sets technical standards for all phases of highway system development, including design, construction, materials, testing, and more.

The standards for ASTM and AASHTO often overlap, and there are times when AASHTO standards reference ASTM standards. Sometimes it is important to know how one standard converts to another. Below, you will find a chart with the common conversions for ASTM and AASHTO standards relating to fasteners.

AASHTO to ASTM Conversion Chart

AASHTO ASTM Specification Description
M-111 A123 Hot-Dip Galvanized Coatings on Iron and Steel Products
M-232 A153 Hot-Dip Coating on Fasteners
M-164 A325 Structural Bolt
M-253 A490 Structural Bolt
M-183 A36 Low Carbon Structural Steel
M-222 A588 High Strength Weathering Steel
M-223 A572 High Strength Low Alloy Structural Steel
M-291 A563 Carbon and Alloy Steel Nuts
M-292 A194 High Strength Heavy Hex Nuts
M-293 F436 Hardened Steel Washers
M-314 F1554 Anchor Bolts



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