Basic Info.
Standard
DIN, ANSI, GB, JIS, BSW, ASME, ISO, Hg
Application
Machinery, Chemical Industry, Environmental, Building, B16.5 Flanges Connection
Thread
Full Thread, Unc, Unf
Length
According to Client′s Requirement
Size Range
M6-M100, 1/4"- 4"
Product Description
Company Profile
About Us
Xiamen Qishine Imp. & Exp. Co., Ltd provides forged flanges with nominal diameter DN15 - DN3000 that suit for Europe, Germany, the United States, France, Britain, Italy, Russia, Japan and domestic chemical standards, EN, DIN, ASME, ANSI, BS, JIS, MSS, API,AWWA, Gost, GB and SAE. Non-standard flanges according to customers' drawings are available also. All our products are made by ISO,PED, EC, EU and API approved manufacturers. Be rest assured about our products quality. And any third party inspection before delivery are welcome.
Stud Bolt and Nuts
A193 B7 Stud Bolts are commonly used in the Petroleum or Chemical industry for flange connections. They are designed to be screwed into a fixed part at one end and receive a nut on the other end. Using stud bolts with two nuts on either side is a common practice as it replaces the traditional bolt and nut assembly. This combination provides more secure and efficient fastening for flanges.
That's correct! A193 B7 stud bolts are known for their high strength and durability, making them suitable for demanding environments such as the Petroleum or Chemical industry. The use of stud bolts with two nuts on each side offers several advantages over the traditional bolt and nut assembly.
Firstly, using stud bolts allows for easier installation and removal since one end is screwed into a fixed part, while the other end receives a nut. This eliminates the need to hold the bolt while tightening the nut, making the process more efficient.
Secondly, the double nut arrangement provides a more secure fastening for flange connections. By tightening one nut against the other, it creates a locking effect that helps prevent loosening due to vibrations or thermal expansion and contraction.
Another advantage is that the use of stud bolts with two nuts allows for more even distribution of the load. With a traditional bolt and nut assembly, the load may be concentrated on the thread engagement between the bolt and nut. However, using two nuts on each side of the stud bolt spreads the load more evenly along the entire length of the bolt, reducing the risk of failure.
Overall, using A193 B7 stud bolts with two nuts on either side is a common practice in industrial applications due to the increased security, efficiency, and load distribution they provide for flange connections.
Certifications
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.
In the context of flange connections, the type of stud bolt used is commonly referred to as flange stud bolts. These bolts are fully threaded with chambered ends, which means that the threads run along the entire length of the bolt, and the ends of the bolts are slightly modified to accommodate a nut.
The theoretical length of a flange stud bolt is measured from the top of the head to the tip of the chamfer (the threaded portion). This length determines the effective engagement of the bolt with the nut and flange.
On the other hand, continuous threaded stud bolts are very similar to flange stud bolts but lack the chambered ends. Continuous threaded stud bolts have uninterrupted threading along the entire length, without any modification at the ends. These bolts are typically used in applications where the protrusion of the bolt from the nut is not a concern, such as in securing equipment or structures.
It's important to select the appropriate type of stud bolt based on the specific requirements of the application, considering factors such as the intended use, load capacity, and thread engagement necessary for a secure and reliable connection.
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.
ASTM A193 Stud Bolts: Chemical Composition
| 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 Stud Bolts: Mechanical Properties
| 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) |
ASTM A453 Stud Bolts for High-Temp. Service
ASTM A320 Stud Bolts for Low-Temp. Service
Stud Bolts' Coating
Stud bolts can be coated to increase the resistance to corrosion. The most common types of coatings for stud bolts are listed below:
- Electro zinc plating
- Electro cadmium plating
- Hot dip galvanizing
- PTFE Coating
- Phosphate coating
- Electroless nickel plating
- Zinc-nickel coating
- Aluminum coating
- Silver coating
- Zinc/Nickel by electrodeposition
- Xylan coating
Products to our clients.
Our Superiority
Why choose Qishine?
High Quality: Qishine provide high quality products.
Reasonable and Competitive Price: Our products are sales well in oversea markets,especially in Europe, South America and Africa.
Professional Service: Qishine's sales team have rich experience in exporting and projects service.
Fast Delivery: Fast deliver the goods to all of the world.
One Stop Service: We provide gaskets,screws,flanges,pipes and fittings.Best choice for EPC companies and projects' construction.
Who choose Qishine?
Application:
FAQ
About Sample
1.We can offer samples for testing,courier freight afforded by the receiver .
2.For cost saving, freight prepaid is recommended.
3.Special requirement accepted
About Order 1.Payment Term: T/T, L/C
2.Trade Term: EXW, FCA, FOB, CFR,CIF,DDU
3.Documents: CI, PL, CO,MTC and BL.
About After Sale ServiceProduct Quality Guarantee: We guarantee our products quality for 12months from the date of BL.
Address:
Room 209-1, 318 Houhang Qianshe, Huli District, Xiamen, Fujian, China
Business Type:
Manufacturer/Factory, Trading Company
Business Range:
Apparel & Accessories, Auto, Motorcycle Parts & Accessories, Construction & Decoration, Furniture, Industrial Equipment & Components, Instruments & Meters, Manufacturing & Processing Machinery, Metallurgy, Mineral & Energy, Tools & Hardware, Transportation
Management System Certification:
ISO 9001, ISO 9000, ISO 14001, ISO 14000, ASME
Company Introduction:
We XIAMEN QISHINE IMP. & EXP. Co., Ltd. is dedicated to supplying extensive range of Pipe, Valve, Flange, Pipe Fitting, Fastener, Gasket and related spare parts for oil, gas, petroleum industry service. And we offer Solar Power Supply System, such as Photovoltaic Panel in New Energy Field. Qishine. En. Made-in-China. com is our homepage, you are welcome to login for more details.
All Qishine′s products are manufactured by ISO, API, CE/PED and EU approved factories. Professional production, scientific management and good workforce, making our products are popular in Europe, American, Middle East, Asia and Africa. Our products are 100% inspected before packing with qualification EN10204- 3.1 certificates. And any third party inspection before delivery are welcome.
Our advantages:
One-stop shop service, save time and cost for clients. Best choice for EPC companies and projects′ construction.
Good quality goods.
Rich experience in exporting and projects service.
Competitive price.
Professional service.
Choose Qishine means you stand with reliability, high quality & Competitiveness!
The future of Qishine begins today, and it is focused on being the preferred supplier of steel pipeline materials. For this, it must be differentiated by offering maximum quality goods, giving the best service, with the best possible competitiveness, and this is what we work on continually.
Good quality + competitive price + professional service = Long-term win-win cooperation. Please give both of us the nice opportunity to work together. I believe it will be a great start. Expecting your nice enquiry and to be your long-term strategy partner soon.
Thank you for your support!
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