ASTM A194 covers carbon, alloy, and stainless steel nuts intended for use in high-pressure or high-temperature service. Grade 2H is the most common carbon steel grade, while Grade 8 and 8M correspond to stainless steel 304 and 316.
These nuts feature a slightly larger width across flats and thickness compared to standard nuts (like DIN 934) to provide greater thread engagement and strength.
Frequently Asked Questions
Why are ASTM A194 nuts thicker than standard nuts?
The 'heavy hex' design provides a larger bearing surface and greater thread engagement, reducing the chance of stripping the threads under extreme pressure or high-temperature expansion.