Professional Double-Ended Studs and Industrial Double-Ended Stud Solutions
Double-Ended Studs
As one of the leading stud bolt manufacturers, Jingfeng has a long history of addressing the complex technological challenges associated with stud bolt manufacturing. For decades, we have specialized in producing stud bolts that meet the most demanding requirements, ensuring reliability and performance in any application. JF stud bolts are manufactured with precision, crafted from a wide range of materials, and available in sizes ranging from the smallest 5/16” (M6) to the largest diameters of 7” (M180). Whether you require standard fasteners in low or high grade materials, thanks to our cutting-edge technology and industry knowledge we offer a wide variety of solutions. JF provides the expertise and quality as one of the premier stud bolt manufacturers in China.
Industrial applications of stud bolts and custom solutions
Jingfeng Company’s stud bolts are designed for a diverse range of industries, including oil&gas and petrochemical, marine, nuclear, rail, renewable and power generation. Our products are essential in critical applications where strength, durability, and corrosion resistance are paramount. From securing flanges in high-pressure piping systems to fastening structural components in heavy machinery,Jingfeng Company’s A193 B7M and A193 B8M stud bolts ensure safe and reliable connections in even the most extreme conditions.
We also offer specialized solutions such as stud bolt 625 for environments exposed to seawater or corrosive chemicals, and stud bolt 660a for high-temperature applications like turbine engines. Our expertise in super duplex stud bolts, including stud bolt s32760, provides unmatched resistance to both mechanical stress and corrosive elements, making them ideal for offshore platforms and other challenging environments.
Stud bolts materials and manufacturing techniques
At Jingfeng Company, we produce stud bolts from a variety of high-performance materials, including austenitic stainless steel, alloy steel, and super duplex alloys. Bea’s manufacturing process includes thread rolling, which ensures superior tensile strength and durability compared to traditional cutting methods. This technique not only boosts production efficiency but also guarantees a uniform thread profile, critical for applications requiring precise fastening solutions. With Jingfeng’s advanced production capabilities, each stud bolt is manufactured to meet the specific needs of your project, ensuring the highest standards of quality and performance.
Materials available for the production of stud bolts
ASTM A453 660 /1.4980
Highly creep and corrosion resistant, precipitation hardening austenitic steel. Scaling resistance in air up to appr. 800°C.
UNS S32760 / ASTM A182 F55
Ferritic-austenitic stainless steel. Excellent corrosion resistance against general corrosion, stress corrosion cracking, corrosion fatigue, pitting, crevice and erosion corrosion and possessing very high mechanical strength properties.
ALLOY 718
High temperature, precipitation hardening, nickel-base alloy with particularly high hot strength and yield strength up to 750°C, and excellent creep behaviour up to 700°C. The markedly higher hot strength compare with normal hot work steels in particularly noticeable when used for hot work tools with high mechanical and thermal stresses.
ALLOY 625
Is a non-magnetic, corrosion and oxidation – resistance, nickel based alloy. High toughness and strength in the temperature range cryogenic to 1000°C. The alloy as excellent fatigue strength and stress corrosion cracking resistance to chloride ions.
ALLOY 925
Is as age-hardenable nickel-iron-chromium alloy. Is used in various applications requiring a combination of high strength and corrosion resistance.
MONEL 400
Is a solid-solution alloy that can be hardened only by cold working. It has high strength and toughness over a wide temperature range and excellent resistance to many corrosive environments. It is widely used in many fields, especially marine and chemical processing.
MONEL 500
Is a nickel-copper alloy with combines the excellent corrosion resistance of Monel 400 with the added advantages of greater strength and hardness. The increased properties are obtained by adding aluminium and titanium to the nickel-copper base by heating.
DUPLEX
Ferritic-austenitic stainless steel also referred to as DUPLEX STAINLESS STEELS, combine many of beneficial properties of ferritic and austenitic steels. Due to the high content of chromium and nitrogen, and often also molybdenum, these steels offer good resistance to localised and uniform corrosion. The duplex microstructure contributes to the high strength and high resistance to stress corrosion cracking.
SUPERDUPLEX
A Super Duplex stainless steel is a type of Duplex stainless steel with enhanced corrosion resistance which is categorised by its PREN being greater than 40. The Pitting Resistance Equivalent Number (PREN) is widely used as a means of comparing the relative corrosion resistance of different steel grades.
ASTM A193
Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications.
ASTM A320
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service.
ASTM F467
Standard Specification for Nonferrous Nuts for General Use.
ASTM F468
Standard Specification for Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use.
Materials Used for Double-Ended Studs
The choice of material depends on application requirements such as strength, temperature, corrosion resistance, and environmental factors. Common materials include:
| Material | Characteristics | Common Uses |
|---|---|---|
| Carbon Steel | High strength, cost-effective | Machinery, automotive |
| Stainless Steel (304, 316, 310, 321, 347) | Excellent corrosion resistance | Marine, chemical, food processing |
| Alloy Steel | High temperature and pressure resistance | Power plants, oil & gas |
| Inconel (600, 625, 718) | High temperature, oxidation, corrosion resistance | Aerospace, heat exchangers |
| Monel (400, K500) | Seawater and chemical resistance | Marine, chemical plants |
| Hastelloy (C22, C276) | Superior chemical resistance | Chemical processing, pharmaceuticals |
| Duplex & Super Duplex Stainless Steel | Excellent strength and corrosion resistance | Offshore, subsea applications |
| Titanium (Grade 2, Grade 5) | Lightweight, high corrosion resistance | Aerospace, medical, marine |
| Nickel Alloys | High-temperature stability | Nuclear, electronics |
Manufacturing Standards
Double-ended studs are manufactured to meet various international standards, ensuring compatibility, quality, and performance across global industrial applications. Some of the commonly followed standards include:
- ASTM A193 / A194 – Alloy and stainless steel stud bolts for high-temperature service.
- ASTM A320 – Stud bolts for low-temperature service.
- DIN Standards (e.g., DIN 976, DIN 939)
- ISO Standards (e.g., ISO 898-1, ISO 3506)
- BS (British Standards)
- ASME / ANSI Standards