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Punit Fasteners, based in Delhi, India, has built a solid reputation as a reliable manufacturer and supplier of top-notch stainless steel fasteners, including the well-regarded Stainless Steel 309 and 309S bolts. With a commitment to precision engineering and robust manufacturing practices, Punit Fasteners guarantees that their products adhere to international standards for strength and resistance to corrosion. Their 309/309S bolts are specifically crafted to excel in high-temperature and challenging environments. By prioritizing quality, durability, and prompt delivery, Punit Fasteners caters to a diverse array of industries, such as power generation, chemical processing, and automotive, making them a dependable partner for stainless steel fastening solutions.
Stainless Steel 309/309S is an austenitic alloy that contains 23–25% chromium and 12–15% nickel, with the 309S variant featuring a lower carbon content (maximum 0.03%) compared to 309 (maximum 0.08%). This unique composition offers outstanding oxidation and corrosion resistance at elevated temperatures. The mechanical properties include a tensile strength of about 515 MPa, a yield strength of around 205 MPa, and an elongation of 40%. The 309S variant is particularly noted for its improved weldability and reduced carbide precipitation, making both grades ideal for applications that involve thermal cycling and exposure to high temperatures.
Element | Content (%) |
Iron, Fe | 60 |
Chromium, Cr | 23 |
Nickel, Ni | 14 |
Manganese, Mn | 2 |
Silicon, Si | 1 |
Carbon, C | 0.20 |
Phosphorous, P | 0.045 |
Sulfur, S | 0.030 |
Properties | Metric | Imperial |
Tensile strength | 620 MPa | 89900 psi |
Yield strength (@ strain 0.200%) | 310 MPa | 45000 psi |
Izod impact | 120 – 165 J | 88.5 – 122 ft-lb |
Shear modulus (typical for steel) | 77 GPa | 11200 ksi |
Elastic modulus | 200 GPa | 29008 ksi |
Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 45% | 45% |
Hardness, Brinell | 147 | 147 |
Hardness, Rockwell B | 85 | 85 |
Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
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.
You’ll find Stainless Steel 309/309S bolts commonly used in high-temperature settings like furnace parts, heat exchangers, boiler components, and thermal processing equipment. Their exceptional resistance to oxidation and scaling makes them perfect for power plants, petrochemical facilities, and the aerospace sector. These bolts are also well-suited for situations where they face corrosive chemicals and thermal cycling, such as in exhaust systems, kiln components, and structural supports in tough environments. Their strength and durability under extreme conditions ensure they deliver long-lasting performance in demanding industrial applications.
Punit Fasteners offers a full range of documentation, including our stainless steel 309/309S bolts, trademarks, packaging information, and quality certificates. We offer comprehensive test reports such as MTC per EN 10204/3.1b, PMI Testing, 100% radiography, and third-party inspections. These documents ensure transparency and the quality and compliance of our bolts, resulting in complete customer satisfaction.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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