Stainless Steel fasteners are used in environments where corrosion resistance, strength, and longevity are critical. Commonly found in industries such as marine, chemical processing, food and beverage, construction, and energy, these fasteners perform exceptionally well in both atmospheric and submerged conditions.
By utilising alloys containing elements such as Chromium, Nickel, Molybdenum, and sometimes Titanium or Copper, Stainless Steel fasteners form a self-healing passive oxide layer that protects against rust and chemical attack. This makes them ideal for applications exposed to moisture, saltwater, or corrosive agents, ensuring structural integrity, reliability, and aesthetic durability over long service periods.
ASTM A193 / A320 Stainless Steel Grades
B6
Made from Type 410 Stainless Steel (Martensitic); offers good strength and moderate corrosion resistance, typically used in mildly corrosive and high-temperature environments.
B8
Made from Type 304 Stainless Steel (Austenitic); provides excellent corrosion resistance and good mechanical properties for general-purpose applications.
B8C
Made from Type 347 Stainless Steel (Austenitic, Columbium-Stabilised); offers improved resistance to intergranular corrosion after welding or high-temperature exposure.
B8M
Made from Type 316 Stainless Steel (Austenitic, Molybdenum-Bearing); provides superior corrosion resistance, especially against chlorides and marine atmospheres.
B8T
Made from Type 321 Stainless Steel (Austenitic, Titanium-Stabilised); ideal for high-temperature service where resistance to scaling and sensitisation is required.
Class 1
Solution annealed condition.
Class 2
Strain hardened condition for higher tensile strength.
Associated Nuts
Grade 8 / 8A
Type 304 stainless steel; corrosion-resistant for general and high-temperature service.
Grade 8C / 8CA
Type 347 stainless steel; niobium-stabilised for improved resistance to intergranular corrosion after welding.
Grade 8M / 8MA
Type 316 stainless steel; molybdenum-bearing alloy providing superior resistance to chlorides and marine environments.
Grade 8R
XM19, S20910 & Nitronic 50™ stainless steel; titanium-stabilised for high-temperature applications.
Grade 8S
S21800 & Nitronic 60™ stainless steel; enhanced strength and oxidation resistance at elevated temperatures.
Grade 8T / 8TA
Type 321 stainless steel; designed for high-temperature service with improved creep strength.
Precipitation Hardened Stainless Steels
ASTM A453 Grade 660 (A, B, D)
High-strength, precipitation-hardened alloy used for high-temperature bolting applications; offers excellent stress rupture and creep resistance.
17/4-PH (UNS S17400)
Chromium–nickel–copper stainless steel combining high strength, good toughness, and moderate corrosion resistance; widely used in aerospace, marine, and chemical process industries.
Austenitic Stainless Steels
300 Series (304, 316, 321, etc.)
Non-magnetic, corrosion-resistant alloys with excellent formability and weldability; available in solution annealed or strain-hardened conditions.
Nitronic® 50 (XM-19)
High-strength, austenitic stainless steel offering superior corrosion resistance and excellent toughness even at cryogenic temperatures.
Nitronic® 60
Alloy engineered for exceptional wear, galling, and oxidation resistance while maintaining good corrosion resistance in marine and industrial environments.
Super Austenitic Stainless Steel
UNS S31254 (6MO / F44)
Molybdenum-rich stainless steel providing outstanding resistance to pitting, crevice, and stress corrosion cracking; ideal for seawater and aggressive chemical service.
Martensitic Stainless Steels
400 Series (410, 420, 431, etc.)
Hardenable stainless steels offering high strength, wear resistance, and moderate corrosion resistance; commonly used for fasteners, shafts, and turbine components.
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