If you need a strong, corrosion-resistant nut for a tough job, especially near saltwater, these 316 stainless steel heavy hex nuts are what you're looking for. They're called 'heavy hex' because they're thicker and wider than your standard hex nut, which gives you a much stronger, more secure connection – perfect for structural stuff, marine applications, or anywhere vibration is a concern. These meet ASME B18.2.2 specs, so you know they're up to code. The thread size is 5/16-18 (that's 5/16 inch diameter, 18 threads per inch), the width across the flats is 9/16 inch, and they're about 19/64 inch thick. The 316-grade stainless steel is the good stuff – it offers way better resistance to corrosion (like from salt spray or chemicals) compared to regular 304 or 18-8 stainless. They have a plain, uncoated finish and come in a handy pack of 25. Whether you're building a boat dock, fixing industrial equipment, or doing any project where rust is the enemy, these nuts are a reliable choice.
