| Customization: | Available |
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| Material: | Carbon Steel |
| Type: | Round Head |
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Fasteners are essential components of almost every industrial and construction project. They are used to join different parts together and play a crucial role in ensuring the safety and reliability of the overall structure. Xylan coated B7 studs, 2H nuts, and B16.5 flange connection fasteners are some of the most commonly used fasteners in various industries. Let's take a closer look at each of these components.
B7 Studs:
B7 studs are high-strength, heat-treated steel fasteners that are commonly used in high-pressure and high-temperature applications. These studs are made from alloy steel and are designed to provide superior strength and durability. They are typically used in flanged joints to secure two separate parts together. B7 studs are available in different diameters, lengths, and finishes to suit different applications.
One of the key advantages of B7 studs is their resistance to corrosion and high-temperature environments. They are often coated with materials such as Xylan to provide additional protection against corrosion and wear. Xylan coating is a fluoropolymer coating that is known for its exceptional anti-corrosion properties. It provides a smooth, non-stick surface that resists friction, wear, and chemical attack.
2H Nuts:
2H nuts are heavy hex nuts that are used in conjunction with B7 studs. These nuts are made from high-strength materials and are designed to provide a secure and tight fit. They have six sides and are larger than regular hex nuts, which makes them ideal for high-pressure applications. 2H nuts are often used in conjunction with B7 studs to provide a secure and reliable joint.
Like B7 studs, 2H nuts are available in different sizes and finishes to suit different applications. They are often coated with materials such as Xylan to provide additional protection against corrosion and wear. Xylan coating is also used to provide a lubricating effect that allows nuts to be easily tightened and removed.
B16.5 Flange Connection:
B16.5 flange connections are a type of fastener that is used to join two separate parts together. These connections are commonly used in piping systems and are designed to provide a secure and reliable joint. B16.5 flange connections are available in different sizes and classes to suit different applications. They are typically made from materials such as carbon steel, stainless steel, or alloy steel.
One of the key advantages of B16.5 flange connections is their ability to provide a leak-free joint. They are designed to provide a tight seal that prevents leaks and reduces the risk of environmental contamination. B16.5 flange connections are often used in conjunction with B7 studs and 2H nuts to provide a secure and reliable joint.
Conclusion:
In conclusion, Xylan coated B7 studs, 2H nuts, and B16.5 flange connection fasteners are essential components of various industries. These components are designed to provide superior strength, durability, and corrosion resistance. They are often used in high-pressure and high-temperature applications where safety and reliability are critical. By using these components, industries can ensure that their projects are completed safely and efficiently.
Stud Bolt Materials
The most common materials for stud bolts (for flanges) are ASTM A193 (grade B7, B8, B8M, B8T), ASTM A453 (grade 660), ASTM A320 (grade L7, L7M), and ASTM A182 (duplex and super duplex bolting). For aggressive fluids and environments, stud bolts can be coated with Xylan/PTFE, Zinc and other materials.
| Physical Element | ASTM A193 grade B7 (AISI 4140) | ASTM A193 grade B8 (AISI 304) | ASTM A193 grade B8M (AISI 316) |
|---|---|---|---|
| Carbon | 0.38 - 0.48% | 0.08% max | 0.08% max |
| Manganese | 0.75 - 1.00% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.040% | 0.030% | 0.030% |
| Silicon | 0.15 - 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.80 - 1.10% | 18.0 - 20.0% | 16.0 - 18.0% |
| Nickel | absent | 8.0 - 11.0% | 10.0 - 14.0% |
| Molybdenum | 0.15 - 0.25% | absent | 2.00 - 3.00% |
| ASTM A193 | Size | Min Tensile Strength (KSI) | Min Yield Strength (KSI) | Min Elongation (%) | RA % min | Max HBW | Max HRC |
|---|---|---|---|---|---|---|---|
| ASTM A193 grade B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 | 321 | 35 |
| 2-5/8 - 4 | 115 | 95 | 16 | 50 | |||
| 4-1/8 - 7 | 100 | 75 | 18 | 50 | |||
| ASTM A193 grade B8 Class 1 | All | 75 | 30 | 30 | 50 | 223 | 35 |
| ASTM A193 grade B8M Class 1 | All | 75 | 30 | 30 | 50 | 223 | 96 |
| ASTM A193 grade B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 | 321 | 35 |
| 7/8 - 1 | 115 | 80 | 15 | 35 | |||
| 1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | |||
| 1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | |||
| ASTM A193 grade B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 | 321 | 35 |
| 7/8 - 1 | 100 | 80 | 20 | 45 | |||
| 1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | |||
| 1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 |
The material chosen for the threaded stud and the hex nuts should be compatible. Materials for bolting sets shall be selected based on the process's working temperatures, as shown in the table below:
| TEMPERATURE °C ( °F ) | ||
| STUD BOLTS MATERIALS | MIN. | MAX. |
| CARBON STEEL | -29 (-20) | 300 (572) |
| A193 B7, L7 | -73 (-100) | 400 (752) |
| A193 B6 | 0 (32) | 500 (932) |
| A193 B8 | -200 (-325) | 575 (1067) |
| A193 B16 | 0 (32) | 520 (968) |
| A193 B17B | -29 (-20) | 650 (1202) |
| A913 Inconel 718 | 0 (32) | 750 (1382) |
| A453 Gr. 660 | -29 (20) | 538 (1000) |
Stud bolts can be coated to increase the resistance to corrosion. The most common types of coatings for stud bolts are listed below:
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