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stud bolt, nut and washer for flange connect

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Certificate: ISO
Flange type EN 1092-1, GB/T 9124.1, PN 16 / PN 25
Material: Alloy steel or stainless steel
Bolt type: Threaded full length, or threaded double ends
Surface: Electro-galvanized, hot dip galvanized, passivated, or plain
Temperature: Carbon steel -20 ~ 300°C, and SS -196 ~ 400°C
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  • Commonly used in the following industries:
  • architecture
  • bridge
  • Petrochemical industry
  • shipbuilding
  • project
  • Offshore and onshore services
  • Power generation industry
  • Food processing industry
  • oil and gas industr
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  • Products are packaged to ensure that there is no damage during transit.
  • In case of exports, standard export packaging is done in wooden cases.
  • All pipes are marked with Grade, Lot No, Size, Degree and our trade mark.
  • On special requests we can also, make custom marking on our products.
  • Wooden Boxes
  • Wooden Pallets
  • Shrink-Wrapped
  • Carton Boxes
  • Wooden Boxes


  •  Manufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report
  •  Positive Material Identification - PMI Testing
  • Chemical Analysis - Spectro Analysis
  • Mechanical Testing Such as Tensile, Elongation, Reduction of Area
  • Micro Test
  • Macro Test
  • Hardness Test
  • Pitting Resistance Test
  • Intergranular Corrosion (IGC) Test
  • Flaring Test
  • Flattening Test
  • Hydrostatic Test
  • Hydrogen-Induced Cracking (HIC) Test, NACE TM0284
  • Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177
  • Radiography Test
  • Dye Penetrant Test (DP Test)
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All materials are strictly inspected at every stage of the production process from procurement to product shipment. Visually inspect them for compliance with ASTM, ASME, MSS, DIN, EN and JIS codes and standards. Support officially certified inspection agencies to witness product material reporting, dimensional and quality compliance. Factory inspections are also supported.

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Product Description

Flange connection should be exactly a bolt, flange, and gasket connection, and its sealing is achieved by the synergy of the three. The gasket is the core component to achieve sealing.

Through the pretightening force of the bolt, sufficient pressure is generated between the gasket and the flange sealing surface, so that the deformation on the gasket surface is enough to fill the microscopic unevenness of the flange sealing surface to achieve the purpose of sealing.

The minimum unit pressing force exerted on the gasket to achieve the above purpose is called specific pressure. When the pipe connected to the flange reaches the operating pressure, the two flanges tend to separate due to the axial force of the internal pressure, while the bolts tend to elongate, and the pressing force acting on the gasket will reduce. When the pressing force acting on the effective cross-section of the gasket drops to a certain critical value, the seal can still be maintained. At this time, the remaining pressing force on the gasket is the effective tightening force of the gasket. When the pressing force on the gasket is less than the effective tightening force, the flange will leak or even blow away the gasket. Therefore, the effective tightening force of the gasket must be greater than the operating pressure of the pipeline. The distance between the two flange sealing surfaces is larger in the operating state than in the initial state. At this time, the tightness of the gasket and the flange sealing surface is guaranteed by the resilience of the gasket.

It can be said that in the initial sealing stage, the surface plastic deformation of the gasket plays a decisive role in filling the microscopic unevenness of the flange sealing surface; while in the operating state of the flange seal, the elastic recovery inside the gasket plays a leading role.

Stud, also called double-head screw or stud. Used to connect the fixed link function of machinery. The stud bolts have threads on both ends, and the screw in the middle can be thick or thin. Generally used in mining machinery, bridges, automobiles, elevators, boiler steel structures, hanging towers, long-span steel structures and large buildings, etc.

It is used when the main body is large-scale equipment and requires the installation of accessories, such as sight glasses, mechanical seal seats, reduction racks, etc. At this time, stud bolts are used. One end is screwed into the main body. After the accessories are installed, a nut is attached to the other end. Since the accessories are often disassembled, the threads will be worn or damaged. It is very convenient to replace them with stud bolts. 2. When the thickness of the connecting body is very large and the length of the bolt is very long, stud bolts will be used. 3. Used to connect thick plates and places where it is inconvenient to use hexagonal bolts, such as concrete roof trusses, roof beam suspension monorail beam suspension, etc.



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