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**[Astm A453 Gr.660 Heavy Hex Nut]()** Ramu Fasteners is a well-regarded **manufacturer and supplier based in Hyderabad**, specializing in top-notch ASTM A453 GR 660 Class C Nuts designed for high-performance applications. Thanks to their cutting-edge production techniques and rigorous quality checks, the company provides heavy hex nuts that comply with international standards for strength, durability, and reliability. These precisely crafted ASTM A453 Class C nuts are perfect for industries that need strong bolting solutions in high-temperature and high-pressure environments. With a reputation for timely deliveries, competitive pricing, and excellent technical support, Ramu Fasteners has earned the trust of clients in petrochemical, power, oil & gas, and heavy engineering sectors looking for superior fastening components. ([Astma453Grade660][1])
ASTM A453 GR 660 Class C Nuts are made from **UNS S66286 precipitation-hardened austenitic stainless steel (Alloy A286)**, which includes nickel (24–27%), chromium (13.5–16%), molybdenum (1.00–1.50%), titanium (1.90–2.35%), along with controlled amounts of carbon, manganese, silicon, and other elements. This unique composition ensures outstanding high-temperature strength and resistance to corrosion. Class C nuts undergo oil quenching and double age hardening to achieve superior mechanical performance, boasting a minimum tensile strength of around **895 MPa and yield strength of 585 MPa**, along with good elongation and hardness that make them suitable for demanding service conditions. ([Astma453Grade660][1])
Material | Dimensions | Standards | Size | Length |
ASTM A453 GR 660 CLASS C Nuts | ASME B18.2.1, B18.3 | ASTM, ASME | M 02 to M 160 | 3 mm to 200 mm |
|
Element |
Content |
|---|---|
|
Carbon |
0.08 max |
|
Manganese |
2.00 max |
|
Phosphorus, max |
0.040 max |
|
Sulfur, max |
0.030 max |
|
Silicon |
1.00 max |
|
Nickel |
24.0-27.0 |
|
Chromium |
13.5-16.0 |
|
Molybdenum |
1.00-1.50 |
|
Tungsten |
– |
|
Titanium |
1.9-2.35 |
|
Aluminum |
0.35 max |
|
Vanadium |
0.10-0.50 |
|
Boron |
0.001-0.010 |
| Tensile Strength/Ultimate Tensile Stress (UTS) – (Mpa) | 895 min |
| Yield Strength/Proof Stress(0.2% Offset) (YS) – (Mpa) | 585 min |
| Elongation in 4D (El) | 15 |
| Reduction | 18 |
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 A 453 GR 660 Class C nuts are used in high-stress, high-temperature applications where strong mechanical performance is crucial. Commonly employed in aerospace, power generation, and petrochemical industries, these nuts are ideal for bolting critical components in engines, turbines, and structural assemblies. Their excellent resistance to oxidation and creep ensures reliability in extreme environments, making them suitable for use in both static and dynamic load conditions.
ASTM A453 GR 660 Class C Nuts find extensive use in **pressure vessels, flanges, valves, heat exchangers, and high-temperature piping assemblies**, where strength and creep resistance are essential. These heavy hex nuts are particularly well-suited for **petrochemical and chemical processing plants, power generation facilities, and oil & gas equipment**, ensuring reliable performance under challenging
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