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American Society for Testing and Materials
Golden rule: A dimensional standard is not automatically a strength or material grade. Standards such as DIN 931, DIN 933, ISO 4014, ISO 4017, ASME B18.2.1 and IFI-145 mainly identify product geometry. The property/material standard controls the
Read article →An ASTM designation on a bolt, nut or washer confirms that the individual component has been manufactured to a particular standard. It does not, by itself, confirm that
ASTM F593 governs inch-series stainless steel bolts and cap screws. This guide covers alloy groups, conditions, marking suffixes, and the F593C/F593G difference.
ASTM A193 covers bolting for high-temperature pressure service; A194 covers the matching nuts. This guide explains grade pairings, traceability, and sour-service requirements.
ASTM A325 defined the heavy hex structural bolt for decades. Now part of ASTM F3125 as Grade A325.