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Mazin Fasteners is a trusted manufacturer and supplier of ASTM A453 Grade 660 Class D Stud Bolts, proudly based in Muscat, Oman. We cater to high-performance industrial applications around the globe. Our company specializes in precision-engineered fasteners that excel in elevated-temperature and high-stress environments. With state-of-the-art manufacturing facilities, rigorous quality assurance processes, and a commitment to international standards, we guarantee consistent product quality and performance. Our dedication to material traceability, technical know-how, and timely delivery makes us a reliable partner for projects in power generation, petrochemicals, and heavy engineering.
ASTM A453 Grade 660 Class D Stud Bolts are crafted from a unique precipitation-hardened iron–nickel–chromium alloy, which includes carefully controlled amounts of nickel, chromium, molybdenum, and aluminum. This special alloy offers outstanding tensile and yield strength, excellent creep resistance, and robust oxidation resistance at high temperatures. Class D stud bolts maintain stable hardness, good ductility, and dimensional stability even under prolonged thermal and mechanical stress, ensuring dependable load-bearing performance and a long service life in demanding operating conditions.
Material | Dimensions | Standards | Size | Length |
ASTM A453 GR 660 CLASS D Stud 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 Grade 660 Class D Stud Bolts are widely used in applications that demand maximum strength retention at elevated temperatures. Common uses include gas and steam turbines, boilers, heat exchangers, pressure vessels, and power generation equipment. They are also extensively employed in petrochemical plants, refineries, and high-temperature processing units that face continuous loads, vibrations, and thermal cycling. These stud bolts are perfect for critical flange connections and assemblies where exceptional creep resistance, oxidation resistance, and long-term reliability are crucial.
At Mazin Fasteners, our ASTM A 453 GR 660 Class D stud bolts are carefully installed to ensure authenticity and quality. Each stud bolt is individually inspected and clamped to prevent corrosion. They are neatly packaged in hard labeled boxes that provide important production information and quantities. Our packaging system protects fasteners during transit, ensuring they arrive in excellent condition, ready to be used in high-stress and high temperature applications.
Mazin Fasteners is a leading manufacturer and supplier of high-quality fasteners in Muscat, OMAN, with over 8 years of experience serving global industries.
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