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Rinku Fasteners, a trusted manufacturer and supplier in Kolkata, India, offers premium ASTM A194 GR.8 Fasteners engineered for heavy-duty industrial applications. Made from high-strength alloy steel and precisely heat-treated, these fasteners provide exceptional tensile strength, hardness, and durability. Designed to perform reliably in high-pressure, high-temperature, and mechanically demanding environments, GR.8 fasteners are widely used in petrochemical plants, refineries, power generation units, and structural assemblies. With rigorous quality control and precision engineering, ASTM A194 GR.8 Fasteners ensure secure, long-lasting connections, delivering safety, stability, and dependable performance for critical industrial applications.
ASTM A194 GR.8 Fasteners are made from high-strength alloy steel, often chromium-molybdenum or carbon steel, which is heat-treated to achieve superior mechanical properties. These fasteners exhibit high tensile and yield strength, excellent hardness, and resistance to wear, deformation, and thermal stress. They maintain dimensional stability and mechanical integrity under high-pressure and high-temperature conditions, as well as cyclic and dynamic loads. The combination of toughness, strength, and durability makes GR.8 fasteners suitable for demanding industrial applications, ensuring reliable performance where high mechanical strength and longevity are critical.
| Element | ASTM A194 GR.8 |
| Carbon | 0.08 max |
| Manganese | 2.00 Max |
| Phosphorus, max | 0.05% |
| Sulfur, max | 0.03% |
| Silicon | 1.00% max |
| Chromium | 18.0-20.0% |
| Nickel | 8.0-11.0% |
| Molybdenum | 0.20-0.35% |
| Tensile Strength/Ultimate Tensile Stress (UTS) – (Mpa) | 550 |
| Yield Strength/Proof Stress(0.2% Offset) (YS) – (Mpa) | 240 |
| Elongation in 4D (El) | 30 |
| Reduction | 40 |
| Hardness – (BHN) | 223 |
|
Material |
Specification |
Standards |
Size
|
Length |
|
ASTM A194 GR.8 Fasteners
|
IS
BS
ASTM
|
DIN, ISO, JIS, GB, IS, BS, ASTM |
M 02 to M 160
|
3 mm to 200 mm
|
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
ASTM A194 GR.8 Fasteners are extensively used in industries requiring secure, high-strength fastening under extreme conditions. They are ideal for high-pressure flanged joints, boilers, pressure vessels, heat exchangers, pipelines, and mechanical assemblies in petrochemical, chemical processing, and power generation plants. GR.8 fasteners are also employed in heavy machinery, structural frameworks, and rotating equipment subjected to thermal and mechanical stress. Their superior strength, durability, and resistance to wear ensure long-lasting and reliable connections. Trusted for critical industrial applications, ASTM A194 GR.8 Fasteners provide safety, operational efficiency, and dependable performance in demanding environments.
We provide our customers with complete documentation to ensure the highest standards in manufacturing and supply. This includes fuming certificates under EN 10204/3.1B, marketing documents, heat treatment plans, quality control systems, packaging materials, material certificates, MTCs and more. We provide 100% radiography test reports and other relevant certifications. This complete documentation demonstrates our commitment to providing quality products and assures that no inferior products or processes are involved.
Rinku Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kolkata, India, with over 8 years of experience serving global industries.
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