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ASTM A193 Stainless Steel 321 / 321H Bolts

Stainless steel bolts are widely used in various industries for their corrosion resistance and durability. Among the many types of stainless steel bolts, the 321 and 321H variants are popular due to their specific properties. Stainless Steel 321 Bolt is a type of austenitic stainless steel that contains titanium. This addition enhances the material's resistance to corrosion, especially when used in high-temperature environments. 321 bolts can withstand temperatures up to 800-1500°F, making them ideal for aerospace, chemical, and petrochemical applications. This bolt type is also known for its excellent weldability, flexibility, and strength.

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The Stainless Steel 321H Bolt is a high-carbon version of 321. The added carbon content improves the material's high-temperature strength, making it ideal for extreme heat environments. This bolt type is commonly used in heat exchangers, boiler components, and other high-temperature applications in the energy and power generation industries. 321H bolts are also resistant to the formation of carbide precipitation due to the carbon addition, which can lead to intergranular corrosion.
Benefits of Stainless Steel 321 Bolt and Stainless Steel 321H Bolt: Stainless steel 321 and 321H bolts have many benefits due to their unique properties. These bolts resist corrosion, cracking, and scaling, even in high-temperature and high-stress environments. They also have excellent weldability, ductility, and formability, making them easy to work with during installation and repair. Additionally, the bolts' high-temperature strengths make them a durable and reliable option for applications requiring high heat resistance levels.

Stainless steel 321 bolts and 321H bolts are two types of austenitic stainless steel bolts resistant to corrosion and high temperatures. 321 bolts contain titanium, while 321H bolts have added carbon content. Both bolt types have excellent weldability, flexibility, and strength, making them ideal for use in aerospace, chemical, and power generation industries. Additionally, the bolts' high-temperature strength and corrosion resistance make them a reliable and durable choice for extreme environments.


SS 321 bolts are widely used due to their excellent corrosion resistance, making them suitable for applications in chemical processing, oil and gas, & marine industries.

321 Stainless Steel bolts have a maximum temperature limit of approximately 870°C (1600°F) before significant loss of strength or structural integrity occurs. Make them well-suited for high-temperature applications in industries like aerospace, power generation & chemical processing.

SS 321H bolts offer improved high-temperature stability compared to SS 321 bolts, with the ability to withstand temperatures up to approximately 1000°C (1832°F) without significant loss of strength or structural integrity. They also exhibit enhanced creep resistance, making them suitable for applications involving prolonged exposure to high temperatures & mechanical stresses.

Specification of Stainless Steel 321 / 321H Bolts

Spec bag
Specifications:ASTM A193 / ASME SA193, ASTM F593
Standard: DIN, ASTM, BS and all International Standards
Length: 3 mm to 200 mm
Bolt Size: M3 - M56 | 3/6" to 2" | Custom Sizes
Heat Treatment: Annealing, Stress Relieving, Case Hardening, Quenching and Tempering.

Types of Stainless Steel 321 / 321H Bolts

Stainless Steel 321 / 321H Square Head Bolts

SS 321/ 321H Square Head Bolt

  • - ASTM A193 SS 321 Square Head Bolt
  • - S32100/S32109 Square Head Bolt
  • - 1.4541 / 1.4878 Square Head Bolt
  • - 321H SS Square Head Bolts
  • - ASME SA193 SS 321H Square Head Bolt
  • - SS 321 Square Head Bolts Supplier
  • - SS 321H Square Head Bolts Manufacturer
Stainless Steel 321 / 321H U Bolts

SS 321/ 321H U Bolt

  • - ASTM A193 SS 321 U Bolt
  • - S32100/S32109 U Bolt
  • - 1.4541 / 1.4878 U Bolt
  • - 321H SS U Bolts
  • - ASME SA193 SS 321H U Bolt
  • - SS 321 U Bolts Supplier
  • - SS 321H U Bolts Manufacturer
Stainless Steel 321 / 321H J Bolts

Stainless Steel 321/ 321H J Bolt

  • - ASTM A193 SS 321 J Bolt
  • - S32100/S32109 J Bolt
  • - 1.4541 / 1.4878 J Bolt
  • - 321H SS J Bolts
  • - ASME SA193 SS 321H J Bolt
  • - SS 321 J Bolts Supplier
  • - SS 321H J Bolts Manufacturer
Stainless Steel 321 / 321H Eye Bolts

SS 321/ 321H Eye Bolt

  • - ASTM A193 SS 321 Eye Bolt
  • - S32100/S32109 Eye Bolt
  • - 1.4541 / 1.4878 Eye Bolt
  • - 321H SS Eye Bolts
  • - ASME SA193 SS 321H Eye Bolt
  • - SS 321 Eye Bolts Supplier
  • - SS 321H Eye Bolts Manufacturer

Equivalent Grades for Stainless Steel 321 / 321H Bolts

STANDARD UNS WERKSTOFF NR. EN JIS
321 S32100 1.4541 X6CrNiTi18-10 SUS 321
321H S32109 1.4878 X12CrNiTi18-9 SUS 321H

Stainless Steel 321 / 321H Bolts Chemical Composition

Grade C Mn Si P S Cr N Ni Ti
321 0.08 2.0 1.0 0.045 0.030 17.0 - 19.0 0.10 9.0 - 12.0 5(C+N) – 0.70
321H 0.04 – 0.10 2.0 1.0 0.045 0.030 17.0 - 19.0 0.10 9.0 – 12.0 4(C+N) – 0.70

Mechanical Properties of Stainless Steel 321 / 321H Bolts

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1457 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %

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Application Industries

  • Refineries
  • Petrochemicals Industry
  • Oil & Gas Industry
  • Mining
  • Construction
  • Pharmaceuticals
  • Automobile