At KD Fasteners, Inc., we recommend our 300 series stainless steel heavy hex bolts for all of your outdoor construction needs. Our 300 series stainless steel is a far superior metal to standard stainless steel as it has excellent corrosion resistance when exposed to the elements.

300 series stainless steel is 18 percent chromium and 8 percent nickel.

stainless steel hex bolts300 series stainless steel characteristics

  • Non-magnetic
  • Maintain strength at high temperatures
  • Easy to maintain
  • Resists corrosion

KD Fasteners, Inc. offers ready and custom made 300 series stainless steel in the following grades.

  • 302 – tough and ductile, cold working increases hardness
  • 302 HQ
  • 303
  • 304 – versatile, carbide precipitation minimized, high-temperature applications, resists acid corrosion
  • 305
  • A2- the metric equivalent of the 300 series


KD Fasteners, Inc.’s line of 300 series stainless steel heavy hex bolts are ideal for the automotive, aerospace and construction industries. These heavy hex bolts can also be used in:

  • Mining industries
  • Chemical industries
  • Cryogenic applications
  • Food industries
  • Dairy industries
  • Pharmaceutical industries
  • Cookware products
  • Appliance products
  • Sinks
  • Tabletops


KD Fastener’s 300 series stainless steel heavy hex bolts are custom made with quick turnaround times. Available in standard (inch) and metric sizing up to 4-inches in diameter. We offer custom sized diameters up to 3 ½ inches. Ask us about the imported and domestic brands we have in stock. Whether you need a standard or custom size, KD Fasteners has a solution for you. Contact us today by calling 1-800-736-5014 or filling out our contact form.