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Punit Fasteners, based in Delhi, India, stands out as a leading manufacturer and supplier of top-notch stainless steel fasteners, particularly specializing in Stainless Steel 347H bolts. Renowned for their precision engineering and commitment to international standards, the company provides a diverse selection of sizes and grades to meet various industrial requirements. With a strong dedication to quality, durability, and customer satisfaction, Punit Fasteners has built a solid reputation among clients in sectors like power plants, petrochemicals, and construction. Their state-of-the-art manufacturing facilities and skilled team guarantee reliable products that can handle the demanding applications across multiple industries.
Stainless Steel 347H is a high-carbon austenitic stainless steel alloy, stabilized with niobium to prevent carbide precipitation during high-temperature exposure. It consists of 17–19% chromium, 9–13% nickel, 0.04–0.10% carbon, along with trace amounts of manganese, silicon, and phosphorus. This alloy boasts a minimum tensile strength of 515 MPa, a yield strength of 205 MPa, and an elongation of 35–40%. It retains good mechanical properties even at elevated temperatures and offers excellent resistance to intergranular corrosion. With a Rockwell hardness of about 95 HRB, Stainless Steel 347H bolts are perfect for environments that require high strength and oxidation resistance.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 347H | min. | 0.04 | – | – | – | – | 17.0 | 3.00 | 9.0 | – |
| max. | 0.10 | 2.0 | 1.00 | 0.045 | 0.030 | 19.0 | 4.00 | 13.0 | – | |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.96 g/cm3 | 1450 °C | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 40 % |
| Specifications | : | ASTM A 193 ASME SA 193 |
| Standard | : | DIN, ASTM, BS and all International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Type | : | Hex Head Bolts, Square Bolts, U bolts, Eye bolts, T bolt, Hex Bolt, Lag Bolts, Counter sunk Bolts. |
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 bolts are widely utilized in industries that demand exceptional performance under extreme conditions. Their outstanding resistance to heat and corrosion makes them ideal for applications in power generation, chemical processing, petroleum refining, and thermal oxidizers. You’ll often find them in heat exchangers, high-pressure steam lines, boilers, and exhaust manifolds, especially in situations where prolonged exposure to high temperatures is a given. Thanks to their ability to resist intergranular corrosion, they are well-suited for welded structures and applications that experience frequent thermal cycling. Additionally, these bolts find their place in aerospace, marine, and construction industries.
We at Punit Fasteners maintain the exacting quality standards of our stainless steel 347H bolts, which is demonstrated by careful labeling. Our commitment is reflected in the trading invoices that go.” beyond, durable packaging, fumigation certificates, complete heat treatment records and strict quality control programs up to MTCs , PMI test certificates, and 100%; complete radiography test certificates further prove our commitment to excellent quality and reliability, so that each bolt is wrapped with the utmost care using protective materials to prevent damage at transport, guaranteeing arrival in optimum condition, ready for immediate use in demanding applications.
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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