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ASTM A453 Grade 660 Class D nuts are engineered for extreme-performance bolting where high-temperature endurance, superior tensile strength, and exceptional structural stability are absolute requirements. Manufactured from premium austenitic alloy steel, these nuts are specifically designed to operate in elevated-temperature environments where conventional stainless fasteners cannot sustain performance. Supplied by Hazlewood Fasteners in Canberra, Australia, A453 Gr.660 Cl.D nuts are widely utilised across power generation, turbine assemblies, petrochemical plants, super-heater systems, and high-pressure steam applications. With unmatched heat resistance and mechanical strength retention, they offer guaranteed fastening reliability in the harshest industrial operating environments.
ASTM A193 B8 Class 4 bolts are crafted from premium 304 stainless steel and strengthened through rigorous strain-hardening — resulting in heightened tensile strength, superior hardness, and exceptional stress-corrosion resistance. Their chromium-nickel austenitic structure shields against oxidizing chemical environments and sustained heat exposure. With refined thread precision and controlled grain structure, these bolts deliver high clamping force, secure torque retention, and fatigue-resistant performance under continuous thermal and mechanical loads. Built to endure where pressure, heat, and corrosive forces collide, they represent a masterclass in stainless fastening excellence.
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 A193 B8 CL4 bolts are chosen for engineering environments where high strength and enhanced stainless corrosion protection are mandatory. They are widely used in refinery piping, chemical processing units, power generation systems, pressure vessels, boiler assemblies, marine fittings, and heat-exchanger networks. Ideal for securing flanges, pumps, turbines, valves, steam lines, and structural supports, these bolts provide confident fastening stability in wet, chemical-laden, and high-temperature environments. When operational demand is extreme and fastener reliability cannot falter, B8 Class 4 bolts provide steadfast performance, securing critical infrastructure with unmatched resilience and confidence.
At Hazlewood 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
Hazlewood Fasteners is a leading manufacturer and supplier of high-quality fasteners in Canberra, Australia, with over 8 years of experience serving global industries.
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