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| Type: | Round Head |
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ABOUT US
Xiamen Qishine Industry Co., Ltd. is a Chinese company established in 2013. We are a leading fabrication services provider in industries such as Oil & Gas, Petroleum, Marine, Oilfield, Mining, and Heavy Industry, specifically for pipeline construction and maintenance.
Qishine is ideal choice for EPC companies and project contractors. Our company specializes in supplying a range of products including Fasteners, Flanges, Gaskets, Fittings, Valves, Pipes and Piping Spare Parts. Our products are API, CE, TUV and ISO certified. Products are widely used on oil rigs, new nuclear power plant, Chemical and Heavy Industry.
Qishine is proud as being a premium product supplier who works closely with our clients to achieve the best possible results. We have an experienced team, skilled labor force, and advanced facilities to ensure safe and efficient project completion, meeting deadlines and budget requirements.
Qishine serves as a comprehensive sourcing partner, streamlining procurement for EPC and project clients.
An A193 B7 stud bolt is a type of bolt with threads on both ends. It is designed to be screwed into a fixed part at one end and to receive a nut at the other end. In the petroleum or chemical industries, they are widely used for flange connections, and the most common combination is a stud bolt with two nuts on either side, which replaces a bolt and nut assembly.
As is well known, there are many different types of double headed bolts in the field of machine translation. The type used for flange connections is called a flange stud bolt and has a fully threaded shaft with cavity ends. The theoretical length is measured by the thread. A continuous threaded stud bolt is very similar, except it has 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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