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Punit Fasteners, based in Delhi, India, stands out as a top-notch manufacturer and supplier of high-quality stainless steel fasteners, including their renowned Stainless Steel 309/309S washers. With a strong focus on quality, precision, and customer satisfaction, Punit Fasteners provides fastening solutions that excel in high-temperature and corrosive environments. Their Stainless Steel 309 and 309S washers are celebrated for their outstanding oxidation resistance and structural integrity, making them perfect for tough industrial settings. Catering to sectors like thermal processing, petrochemicals, and power generation, Punit Fasteners guarantees reliable products that comply with international standards for both local and global markets.
Stainless Steel 309/309S is an austenitic chromium-nickel alloy that contains 22–24% chromium and 12–15% nickel. The 309S variant features a lower carbon content compared to standard 309, which improves its weldability and minimizes carbide precipitation. These washers boast a tensile strength of about 550 MPa, a yield strength of roughly 205 MPa, and an elongation of 40%. With a typical hardness of around 95 HRB, Stainless Steel 309/309S washers deliver impressive high-temperature strength, corrosion resistance, and durability in thermal and mildly corrosive conditions.
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.
These washers are commonly found in high-temperature and oxidation-sensitive environments. Typical uses include heat exchangers, furnaces, kiln linings, boilers, and incinerators. They play a vital role in thermal processing equipment, flue gas systems, and refinery operations, where resistance to thermal cycling is essential. Industries such as petrochemical, metallurgy, cement, and power generation depend on 309/309S washers for their structural stability and corrosion resistance. Their ability to maintain mechanical strength and resist scaling at elevated temperatures makes them a reliable choice for critical fastening in demanding industrial applications.
At Punit Fasteners, our commitment to quality is evident in the rigorous testing of all Stainless Steel 309/309S washers before shipment. We conduct advanced testing, including hardness, chemical analysis by Spectro analysis, good material identification (PMI), levelling, micro-macro, pitting resistance and intergranular corrosion (IGC) testing. In addition, we offer third-party inspection certificates to confirm that our washers meet the highest standards of quality and reliability, ensuring exceptional performance in harsh environments.
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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