ASTM A453 Grade 660 nuts are special fasteners used in high-temperature and corrosion-resistant applications. These nuts are made from alloy materials that have a higher yield strength than other types of steel, making them ideal for projects that require a lot of strength and durability.

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ASTM A453 Grade 660 Nuts come in two main varieties: hexagonal and square. The hexagonal type is the most common, as it is easier to use in tight spaces due to its six-sided shape. Square nuts are also available, though their shape can make them harder to install in some cases. Both types come with either coarse or fine threads, depending on the application needs.


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ASTM A453 Grade 660 Nuts are often used in high-temperature applications such as boilers or pressure vessels, as well as corrosive environments like chemical processing plants or wastewater treatment centers. They are also ideal for applications where extra strength is required, such as heavy equipment or machinery parts like valves and flanges. In addition, these nuts are resistant to vibration fatigue, making them perfect for any project where vibration could cause damage to traditional fasteners over time.  ASTM A453 Grade 660 Washers, ASTM A453 Grade 660 Hex Bolts and many more grades are also available.

ASTM A453 Grade 660 Nuts

ASTM A453 Grade 660 Nuts

ASME SA453 Grade 660 Nut offer superior strength and corrosion resistance compared to other types of steel fasteners, making them ideal for use in high-temperature and corrosive environments. Hexagonal and square varieties are available with either coarse or fine threads depending on the application needs, while their extra strength makes them suitable for heavy equipment or machinery parts that may be subject to vibration fatigue over time. Different types of products are available, such as Incoloy 825 Forgings, Duplex Steel UNS S32205 Forged Fittings, etc.

ASTM A453 Grade 660 nuts are a type of high-strength alloy steel nut used in demanding, high-temperature applications. Efficiancy to their grade, they’re highly resistant to corrosion and oxidation even at temperatures exceeding 650°C (1200°F). This makes them an ideal choice for environments with extreme temperatures such as the petrochemical and aerospace industries or even for those who need strong and reliable performance in dry or subsea settings. The nuts also offer excellent strength properties making them an attractive option across multiple sectors. By using Grade 660 nuts, engineers and technicians can achieve great peace of mind knowing that their equipment is being kept secure at all times.

What are ASTM A453 Grade 660 Nuts?

ASTM A453 Grade 660 Nuts are high-temperature nuts made from an austenitic stainless steel alloy that has been specially heat-treated to achieve excellent mechanical properties at elevated temperatures. These nuts are commonly used in high-pressure & high-temperature applications.

What are the advantages of using ASTM A453 Grade 660 Nuts?

ASTM A453 Grade 660 Nuts offer several advantages over other types of nuts. They have excellent resistance to creep, oxidation, & corrosion at high temperatures, making them ideal for use in harsh environments.

What are the applications of ASTM A453 Grade 660 Nuts?

ASTM A453 Grade 660 Nuts are used in various applications, including in the chemical and petrochemical industry, gas turbines, and power plants. They are used to make parts that require high strength, corrosion

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Class A/B/C/D Grade 660 ASTM A453 Nuts Specification

Standard ASME SA453, ASTM A453 Grade 660 Class A/B/C/D

Dimensions ANSI B18.2.2, DIN 934,ISO 4032, BS1768, BS 1769

Threads Configuration ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads

Size M02 to M160

Type Cold Forged, Hot Forged, Bar Stock Machined, Bar Stock Milling

Length 3 mm to 200 mm

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ASTM A453 Grade 660 Nuts Chemical Composition

Element C Mn P S Si Ni Cr Mo Ti Al V B
Grade 660 0.08 max 2.00 max 0.040 max 0.030 max 1.00 max 24.0-27.0 13.5-16.0 1.00-1.50 1.9-2.35 0.35 max 0.10-0.50 0.001-0.010

ASME SA453 Grade 660 Nuts Mechanical Properties

ASTM A453 Class Tensile, Mpa Yield, Mpa Elong. %, min RA %, min
Grade 660 A, B , C & D 895 min 585 min 15 18

Other Types of ASTM A453 Grade 660 Class A/B/C/D Nuts

  • ASTM A453 Grade 660 Class A Hex Nut
  • ASTM A453 Grade 660 Class B Square Nut
  • ASTM A453 Grade 660 Class C Wing Nut
  • ASTM A453 Grade 660 Class D Coupling Nut
  • ASME SA453 Grade 660 Slotted Nut

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