| Material: | B637 Uns N07718 |
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| Type: | Round Head |
| Connection: | Common Bolt |
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| Currency: | US$ |
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ASTM A453/ A453M Grade 660 Class A/B/C/D, UNS S66286, Alloy A286 Bolting for High Temperature Application.
A stud bolt with 2 heavy hexagonal nuts is a type of threaded fastener commonly used in industrial applications. The stud bolt is a threaded rod with a fully threaded shank and a head on one end, while the heavy hexagonal nuts have a larger size and thickness than standard nuts. The full-length threading on the stud bolt allows for increased flexibility in installation, and the two heavy hexagonal nuts provide additional holding power and ensure a secure fastening.
The stud bolt with 2 heavy hexagonal nuts is used in a wide range of industries, including petrochemical, construction, and transportation. It is commonly used in applications where a strong and secure connection is required, such as in the construction of pipelines, pressure vessels, and machinery.
One of the main advantages of the stud bolt with 2 heavy hexagonal nuts is its ease of installation. The full-length threading on the stud bolt allows for easy alignment with the mating parts, and the heavy hexagonal nuts provide a larger surface area for tightening, reducing the risk of over-tightening or damaging the bolt. The two nuts also provide a secure locking mechanism, preventing the stud bolt from loosening due to vibrations or other external forces.
In addition, the stud bolt with 2 heavy hexagonal nuts is highly resistant to corrosion and can withstand high temperatures and pressures. It is typically made from materials such as stainless steel, carbon steel, or alloy steel, depending on the specific application and environmental conditions.
Overall, the stud bolt with 2 heavy hexagonal nuts is a reliable and durable fastener that provides a secure and easy-to-install solution for a wide range of industrial applications. Its high strength, corrosion resistance, and versatility make it a popular choice among engineers and manufacturers around the world.
We offer precisely made stud bolts, hex bolts, heavy hex bolts, socket head cap screws, threaded rods, nuts and washers of ASTM A453 Gr. 660 A/B/C/D. An alloy that is precipitation hardenable for high mechanical properties. The alloy maintains good strength and oxidation resistance at temperatures up to about 1300°F (700°C). The alloy's high strength and excellent fabrication characteristics make it useful for various components of aircraft and industrial gas turbines.
Applications include blades, vanes, shafts, tail cones, afterburners, springs, and fasteners. This alloy is also used for automotive applications.
A-286 Chemical composition:
| Aleación | % | Ni | Cr | Mo | B | Fe | Al | Ti | C | Mn | Si | V | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A-286 | Min. | 24 | 13.5 | 1.0 | 0.001 | 1.9 | 0.1 | ||||||
| Max. | 27 | 16 | 1.5 | 0.01 | Balance | 0.35 | 2.35 | 0.08 | 2.0 | 1.0 | 0.5 | 0.03 |
A-286 Physical properties:
| Density | 7.93 g/cm3 |
| Melting range | 1364-1424ºC |
A-286 minimum mechanical properties in the room temperature:
| Status | Tensile strength Rm N/mm2 |
Yield strength RP0.2N/mm2 |
Elongation A5 % |
| A-286 | 950 | 680 | 28 |
A193 B7 Stud Bolt is a bolt with threads on both ends that designed to be screwed into a fixed part at one end, and to receive a nut on the other end. In Petroleum or Chemical industry, they are prominently used for flange connection, so stud bolt used with two nuts on either side is the most common combination which replaces bolt and nut assembly.
As we know that Stud Bolts have many categories, the type for flange connection is called flange stud bolts, which has fully thread with chambered ends. The theoretical length is measured the thread. Continuous threaded stud bolt is very similar to it, except no chambered ends.
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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