Hardness testing to ISO 6508-1
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ASTM A453 Grade 660 Fasteners are high-strength hardware components made from a specialized alloy known as Grade 660 or A286. This alloy is a precipitation-hardening stainless steel with a unique chemical composition that includes iron, nickel, chromium, and other elements. The chemical composition of ASTM A453 Grade 660 typically includes 24-27% nickel, 13.5-16% chromium, 1.3-2.2% titanium, 1-1.5% aluminum, and small amounts of molybdenum, vanadium, and other elements. The controlled additions of titanium and aluminum promote the formation of the A286 alloy's desirable properties during heat treatment.
One of the key features of ASTM A453 Grade 660 Fasteners is their exceptional high-temperature strength and mechanical properties. They offer excellent tensile strength, fatigue resistance, and creep strength, making them ideal for applications in high-temperature environments such as gas turbines, jet engines, and exhaust systems.
Corrosion resistance is another significant advantage of ASTM A453 Grade 660 Fasteners. The alloy's high chromium content provides good resistance to a wide range of corrosive media, including acidic and chloride-rich environments. This makes them suitable for applications in chemical processing plants, where exposure to corrosive chemicals is common.
Corrosion resistance is another significant advantage of ASTM A453 Grade 660 Fasteners. The alloy's high chromium content provides good resistance to a wide range of corrosive media, including acidic and chloride-rich environments. This makes them suitable for applications in chemical processing plants, where exposure to corrosive chemicals is common.
Specifications | ASTM A453, ASME SA453 |
Standard | DIN, ASTM, BS and all International Standards |
Size | M3 to M90 |
Length | 10mm to 1000mm |
Dimensions | DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
Threads available | UNF, BSW, BSF, METRIC, UNC, or as required |
Threads Configuration | ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads |
Form | Hex, Threading, Square, Round as per Gauge Etc. |
Head | Hex, Square, Round, Hex flange, Flat, T-head & Triangular etc. |
Neck type | Hex, Square, Triangular, Oval & Knurled etc. |
Surface Coating | Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request |
Manufacturing Process | Wire Drawing, Cold Heading, Insert tapping, Heat Treatment, Surface Plating, Inspection, Packing. |
Additionally, ASTM A453 Grade 660 Fasteners are utilized in the oil and gas industry for downhole applications and drilling equipment, where resistance to high pressures and harsh conditions is essential. They are also employed in chemical processing plants, desalination facilities, and power generation facilities for fastening critical equipment, valves, and fittings that require excellent high-temperature performance and corrosion resistance.
To preserve the high standards of our selection of industrial fasteners, we have always adhered to a systematic quality management process.
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UNS No | DIN | xxx | Grade |
UNS S66286 | DIN 1.4980 | Alloy 1.4943 | Grade 660 |
Element |
Content % |
---|---|
Grade 660 UNS S66286 | |
Carbon | 0.08 max |
Manganese | 2.00 max |
Phosphorus | 0.04 max |
Sulfur | 0.03 max |
Silicon | 1.00 max |
Nickel | 24.00 - 27.00 |
Chromium | 13.50 - 16.00 |
Molybdenum | 1.00 - 1.50 |
Titanium | 1.90 - 2.35 |
Aluminum | 0.35 max |
Vanadium | 0.10 - 0.50 |
Boron | 0.001 - 0.010 |
Grade | Class | Tensile Strength | Yield Strength | Elongation in 4D, min, % |
Reduction of Area, min, % |
Brinell Hardness Number |
Approximate Rockwell Hardness, B & C |
|||
Ksi | Mpa | Ksi | Mpa | min | max | |||||
Grade 660 | A, B and C | 130 | 895 | 85 | 585 | 15 | 18 | 248-341 | 24 HRC | 37 HRC |
Grade 660 | D | 130 | 895 | 105 | 725 | 15 | 18 | 248-341 | 24 HRC | 35 HRC |
Hardness testing to ISO 6508-1
Nut proof load testing to ISO 898-2
Suitability for preloading to EN 14399-2
Calibrated gauges and tools
UNS S66286 Hex Head Fasteners | Alloy A453 Nuts and Fasteners |
Alloy A453 Square Fasteners | Alloy A453 Star Fasteners |
Alloy A453 Flat Washer | Alloy A453 Fasteners and Nuts |
Alloy WERKSTOFF NR. 1.4980 Flat Washers | Alloy A453 Nuts |
Alloy A453 U Fasteners | Alloy A453 Lag Fasteners |
Alloy A453 T Fasteners | Alloy A453 Alloy Hex Head Nut |