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Punit Fasteners, a reputable manufacturer and supplier located in Delhi, India, focuses on crafting high-quality Stainless Steel 347 Nuts that excel in high-temperature and corrosive settings. SS 347 is a stabilized austenitic stainless steel known for its remarkable resistance to intergranular corrosion and oxidation, making it a top choice for tough industrial tasks. With precision manufacturing and rigorous durability testing, Punit Fasteners offers 347-grade nuts in various sizes, threads, and finishes. These nuts find extensive use in aerospace, chemical processing, power generation, and heat exchanger systems, ensuring reliability, longevity, and consistent mechanical performance even in extreme conditions.
Stainless Steel 347 Nuts are crafted from an austenitic stainless steel alloy that includes 17–19% chromium, 9–13% nickel, and a touch of niobium (columbium) to stabilize the structure against chromium carbide precipitation. This stabilization guarantees outstanding resistance to intergranular corrosion after welding or when exposed to high temperatures. SS 347 nuts boast a tensile strength ranging from 515–750 MPa and a yield strength between 205–500 MPa. They retain excellent mechanical properties at elevated temperatures, show great creep resistance, and remain non-magnetic in their annealed state, making them perfect for high-pressure and high-heat fastening needs.
| 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, Hex Head nuts, Square nuts, Lock nuts, Eye nuts, wing nuts, T nuts, Panel Nuts, Coupling Nuts, Dome nuts, Acorn Nuts. |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 347 | min. | – | – | – | – | – | 17.0 | 2.00 | 9.0 | – |
| max. | 0.08 | 2.0 | 1.00 | 0.045 | 0.030 | 20.0 | 3.00 | 13.0 | – | |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 347 | 515 | 205 | 40 | 95 | 201 |
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.
Stainless Steel 347 Nuts are perfect for situations where they face heat, pressure, and corrosive chemicals. You’ll often find them in heat exchangers, pressure vessels, boilers, chemical tanks, exhaust manifolds, and refinery equipment. Thanks to their niobium stabilization, they resist intergranular corrosion during welding and thermal cycling, making them ideal for high-temperature service conditions. SS 347 nuts are widely utilized in the aerospace, petrochemical, and power generation industries, ensuring they meet the demands of challenging 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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