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Mira Fasteners is a well-respected manufacturer and supplier of ASTM A453 Grade 660 Class D Nuts, proudly based in Kuala Lumpur, Malaysia. These high-performance nuts are specifically designed for critical, high-temperature applications across various industries, including power generation, petrochemical, aerospace, and oil & gas. Each nut is crafted in line with international standards and undergoes rigorous testing for mechanical strength, dimensional accuracy, and heat resistance. With a solid reputation for quality and timely delivery, Mira Fasteners has become a go-to source for specialty fasteners throughout Malaysia and Southeast Asia.
The ASTM A453 Grade 660 Class D Nuts are constructed from precipitation-hardened austenitic stainless steel, featuring a blend of nickel (24–27%), chromium (13–17%), molybdenum (1.5–2.5%), and other trace elements to boost high-temperature strength. These nuts are heat-treated to achieve impressive specifications, with a minimum tensile strength of 895 MPa and a yield strength of 585 MPa. Class D stands out as the top performer in the Grade 660 lineup, particularly excelling in stress rupture and creep resistance, making them perfect for enduring temperatures up to 704°C (1300°F). The alloy’s resistance to oxidation also guarantees long-lasting stability in thermal cycling conditions.
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.
You’ll find ASTM A453 Grade 660 Class D Nuts commonly used in flanged joints, turbines, pressure vessels, heat exchangers, and other components that face extreme thermal and mechanical stresses. Their reliability in fluctuating pressure and temperature scenarios makes them essential for critical bolted assemblies in power plants, refineries, and high-pressure processing systems. These nuts play a vital role in ensuring the safety and integrity of heavy-duty equipment by keeping connections secure in environments where standard fasteners might fail. Plus, their long service life and lower maintenance requirements make them a smart, cost-effective choice for high-stakes operations.
At Mira 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
Mira Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kuala lumpur, Malaysia, with over 8 years of experience serving global industries.
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