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Lina Fasteners is a trusted manufacturer and supplier based in Tunis, Tunisia, specializing in high-quality ASTM A453 Grade 660 Class D Nuts designed for extreme high-temperature and high-stress environments. The company adheres to rigorous manufacturing and quality assurance protocols to guarantee precision, consistency, and compliance with global standards. Lina Fasteners provides Class D nuts that are specifically engineered for tough service conditions, delivering outstanding strength, thermal stability, and long-lasting reliability. Their dedication to quality, technical know-how, and prompt delivery supports vital industries that depend on strong and heat-resistant fastening solutions.
ASTM A453 Grade 660 Class D nuts are crafted from a precipitation-hardening iron-nickel-chromium alloy, which contains about 24–27% nickel and 13–16% chromium, along with additions of molybdenum, titanium, aluminum, and controlled carbon. This unique alloy offers exceptional proof and tensile strength, remarkable creep resistance, and excellent stress-rupture characteristics. Mechanically, Class D nuts retain their strength, toughness, and oxidation resistance even at elevated temperatures, ensuring reliable performance under extended thermal exposure and heavy mechanical loads.
Material | Dimensions | Standards | Size | Length |
ASTM A453 GR 660 CLASS D Bolts | 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 A453 GR 660 Class D Nuts find extensive use in applications that involve extreme temperatures and significant mechanical stress. Common applications include gas and steam turbines, boilers, heat exchangers, power generation systems, and high-temperature pressure equipment. They are also utilized in petrochemical plants, refineries, and chemical processing facilities where resistance to oxidation, scaling, and thermal fatigue is crucial. These nuts provide secure fastening, maintain joint integrity, and ensure a long service life in demanding industrial environments.
At Lina Fasteners, we ensure that the ASTM A 453 GR 660 Class D nuts are installed with the utmost care. Each nut is carefully inspected and individually wrapped to prevent damage during transport. Our packaging includes hard labeled boxes that provide clear product information and quantity information. This careful process assures that the nuts arrive in optimal condition, ready for reliable performance at high temperatures and high pressures
Lina Fasteners is a leading manufacturer and supplier of high-quality fasteners in Tunis, Tunisia, with over 8 years of experience serving global industries.
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