Ring Gasket

Ring Gasket (RTJ Gasket)

Ring Gasket or Ring Type Joint Gasket (RTJ gasket), is a type of gasket used in high-pressure, temperature, and corrosive environments. RTJ gaskets products are used in oil & gas pipelines, chemical processing plants, power generation plants, refineries, and other industrial applications that require a high level of reliability and safety. Ring gaskets come in various sizes, shapes, and materials to suit different applications. 

The Ring Joint (RTJ) gasket is typically made of precision-machined metal, such as stainless steel or Inconel, and has a specific shape that provides a robust and reliable seal between flange connections. The gasket has a raised ring with an oval or octagonal shape that fits into a corresponding groove on the flange faces. The ring type joint rtj gasket’s shape allows it to deform under compression, creating a tight and secure seal. When the flanges are tightened, the gasket is compressed, and the raised ring is deformed to create a metal-to-metal seal that can withstand high pressure. The initial contact occurs between the flange faces and the octagonal or oval rings of the gasket.

RTJ gaskets offer a range of Features and Benefits that make them highly sought-

The motion of the ring (RTJ)product can be characterized as an irregular flow within the deformed sealing flange groove caused by the axial compressive load. The colored seal (RTJ seal) has a limited contact area, resulting in high surface pressure between the sealing surface and the groove. As a result, the maintenance properties are subpar, and reusability is not recommended.

  • Enhanced durability and longevity: They can withstand repeated usage, thermal cycling, mechanical stresses, and extreme conditions providing a long-lasting sealing solution.
  • Excellent corrosion and chemical resistance: RTJ gaskets are typically made from materials such as soft iron, stainless steel, or alloyed metals providing exceptional resistance to corrosion and chemicals.
  • Easy installation and maintenance: Ring gaskets are relatively straightforward to install, thanks to their design that fits into special grooves on flange faces. Additionally, Ring Joint gaskets require minimal maintenance, making them a convenient choice for industrial applications.
  • Outstanding sealing performance: Ring gaskets product deform under compression, creating a tight seal that prevents leaks and blowouts, even under high pressures.

Types of Ring Gaskets

We are the largest Industrial Gasket Manufacturing facility in Asia. We take pride in being the leading and trusted RTG gasket manufacturer, delivering reliable sealing solutions for diverse industrial applications. The specific types of RTJ gaskets product, such as 6BX and 6B, are designed for higher-pressure applications and are commonly used in offshore oil and gas installations. At Asian Sealing Products, we manufacture 14 types of ring-type joint gaskets (RTJ) with the highest quality, and we will ensure that the gaskets are delivered to the customers on time.

  • Oval cross section Ring Type Joint Gaskets
  • Octagonal cross section Ring Type Joint Gaskets
  • RX type Ring Type Joint Gaskets
  • BX type Ring Type Joint Gaskets
  • SRX type Ring Type Joint Gaskets
  • Ring Joint Gaskets Blind Gaskets
  • Ring Joint Gaskets Kammprofile-Octagonal
  • Ring Joint Gaskets Pressure Energized Gaskets
  • Ring Joint Gaskets Kammprofile-Adapter Gaskets
  • Bridgeman Gaskets
  • Delta Gaskets
  • Lens Ring
  • Kammprofile Gaskets

Selecting the right RTJ gasket requires careful consideration of several factors.

Matching gasket materials with specific applications:

  • Soft iron: Ideal for applications involving low-pressure and non-corrosive media.
  • Stainless steel: Offers excellent corrosion resistance and is suitable for a wide range of applications, including those involving high temperatures and aggressive chemicals.
  • Inconel: Provides exceptional resistance to extreme temperatures, pressure differentials, and corrosive environments.
  • Duplex and super duplex: Suitable for applications requiring high strength, corrosion resistance, and resistance to pitting and crevice corrosion.

Proper ring profile selection based on flange type:

  • Octagonal Rings: Preferred for API flanges (R gaskets, RX gaskets, and BX gaskets) that have a tapered groove design. Each type has unique cross-sections and is designed for specific flange types.
  • Oval Rings: Suitable for non-API flanges that have a flat-bottomed groove design.
Product Details
  • Oval cross-section Industry Ring Joint Gaskets and Octagonal cross section Ring Joint Gaskets are used in pressures up to 10,000 psi
  • The hardness of the ring gasket should always be 30% lesser than the hardness of the flanges to prevent flange deformation
  • Dimensions and Tolerances for Ring Joint Gaskets and Grooves are covered in API 6A and ASME B16.20.
  • We stock a wide range of sizes and materials ready for immediate shipment from Ring Numbers R11 to R105.
  • Specially designed for very high pressure
  • All BX gaskets incorporate a pressure balance hole to ensure equalisation of pressure, which may get trapped in the grooves
  • Only suited for API BX flanges and grooves
  • Available from BX150 to BX303
  • SBX type Ring Type Joint Gaskets are as per API 17D standard.
  • Dimensions and tolerances of SBX type are as per API 6A, but it consists of additional pressure passage hole. The hole comes as per two options as stated in API 17D standard depending upon the requirement of the application where the flange is installed.
  • SBX type gaskets are strictly produced only using non corrosive material as per the requirement of API 17D standard.
  • An adaptation of the standard ‘r’ type gasket
  • Designed to fit the same groove design
  • Interchangeable with standard r type gaskets
  • Available from rX20 to rX215
  • Combination rings or transition rings combine two different sizes having the same pitch diameter permitting bolt up of differing size flanges
  • SrX type gaskets are similar to rX gaskets
  • But SrX Ring Joint Gaskets come with a special vent hole to allow water to escape in subsea applications
  • Ring Joint Gaskets can also be manufactured as a blind profile
  • Ring Joint Gaskets Rubber Coated
  • Rubber coated oval/octagon Ring Joint Gaskets (usually steel) are used in pressure testing to minimise damages to flanges
  • Rubber contact points provide additional seals while protecting the flange surfaces
  • Kammpro-orJ Ring Joint Gaskets are sized to the standard octagonal aPI 6a or aSMe B16.20 dimensions
  • With the addition of the Kammpro design, these Kammpro-OCT Ring Gaskets are applied to the sealing areas and faced with oxidation inhibited flexible graphite
  • The design is ideal for applications where cracking or embitterment has been experienced in ring joint groove
  • Kammprofile – PEG with Kammprofiled sealing surfaces are ideal for high pressure reactors where a rX type ring is typically used
  • Frequently, custom ring is used in the top and bottom of hydro processing reactors
  • gasket surfaces are serrated as per Kammprofiled specifications and are faced with oxidation inhibited flexible graphite.
  • It has the benefits of under compression graphite flows into minor imperfections creating higher seal tightness.
  • Kammpro-adapter gaskets allow ring type joint flanges to be mated up to a raised face flanges
  • They utilise the strengths of the full metallic with the added benefit of kamm profiled sealing surfaces laminated with flexible graphite
  • Since the pitch of the groove is sufficiently located under the raised face, this design is among the stoutest of adapter styles
  • The Bridgeman gasket is a pressure-activated gasket typically used on pressure vessel heads and valve bonnets for pressures of 1500 psi and above
  • The cross section of the gasket is such that the internal pressure acting against the ring forces is turned against the containing surface, creating a self-energized seal
  • Bridgeman gaskets are frequently silver-plated or lead-plated
  • This ensures in providing a softer surface and minimises the force required to flow the gasket metal into the flange surface
  • A delta gasket is a pressure-actuated gasket used primarily on pressure vessels and valve bonnets at high pressures in excess of 5000 psi
  • As with the lens gasket, complete drawings and material specifications must be supplied
  • Internal pressure forces the gasket material to expand, whereas the pressure forces tend to separate the flanges
  • Extremely smooth surface finishing of 63 micro inches or smoother is required when using this type of gasket
  • A lens type ring gasket is a line contact seal used in high pressure piping systems and in pressure vessel heads
  • The lens cross-section is a spherical gasket surface and requires special machining on the flanges
  • These gaskets fit with a small bolt load since the contact area is small and gasket seating pressures are very high
  • Normally, the gasket materials should be softer than the flange

When ordering lens gaskets, complete drawings and material specifications must be supplied.

  • A composite gasket that utilises a serrated metal core with a soft facing material
  • The metal core is machined on each contact face with concentric serrations, providing high pressure areas
  • This ensures the soft coating flows into any imperfections in the flange even at relatively low bolt loads
  • The soft facing material is engineered to compress into the serrations on the core and form a thin film across the peaks creating the ideal sealing density in the grooves of the profile
  • The result? You get a gasket that combines the benefits of soft cut materials with the advantages of seal integrity associated with metallic gaskets
  • Expanded graphite is the most common facing material used for Camprofile gaskets
  • However, other materials can also be used. For instance, PTFE for chemically aggressive duties and mica for high temperature services
  • Standard core design is parallel which offers the advantage of even stress distribution across the gasket face
  • Convex Cam profiles are also available which have a reduced depth of grooves towards the Profile Centre
  • This type of profile ensures a high seating stress in the middle of the profile and is effective for low bolt load applications
  • A wide range of seating stresses under which the seal is effected and maintained
  • Recommended for insufficient bolt loads to seal conventional gasket materials
  • Easy to handle and fit
  • Suitable for a wide range of operating conditions
  • The soft facing layer prevents damages to the mating flange
  • Sealing is not sensitive to uneven bolt loading conditions
  • Can be refurbished with a new facing layer and reused
Ring Gasket with the hardness numbers as follows:
SI. No. Material Grades Hardness Requirements Standard Reference
Rockwell Hardness Machine Brinell Hardness Machine
1 Soft Iron 56 HRBW Max 90 HBW Max ASTM A29/ A29M-20
2 Low Carbon Steel 68 HRBW Max 120 HBW Max ASTM A29/ A29M-20
3 SS 316 83 HRBW Max 160 HBW Max ASTM A182/ A182M- 23
4 SS 316L 83 HRBW Max 160 HBW Max ASTM A182/ A182M- 23
5 SS 316 Ti 83 HRBW Max 160 HBW Max ASTM A182/ A182M- 23
6 AISI 4140 92 HRBW Max 197 HBW Max ASTM A29/ A29M-20
Note: Above Material can be supplied with low hardness than the standard hardness with special Heat Treatment as per Customer Requirements


Ring gaskets also known as RTJ. They are mostly used in offshore oil and gas pipelines and are designed to work under extremely high pressure and high-temperature applications. They are solid rings of metal in different cross sections like oval, round, octagonal etc… that deform under compression to create a tight seal.

Selecting the right RTJ gasket involves considering factors such as pressure and temperature requirements, flange design and dimensions, media compatibility, and joint assembly. Consulting with a trusted RTJ gasket supplier or manufacturer can help you determine the most suitable gasket for your specific needs.

Placing the gasket securely within the flange groove and pitch diameter dimensions is critical for the proper installation of Ring joint gaskets. Precise measurements and alignment of the flange are necessary to achieve an effective seal.

The lifespan of RTJ gaskets depends on various factors, such as operating conditions, maintenance practices, and gasket material. Regular inspections of the gaskets should be performed, and they should be replaced if signs of wear, degradation, or loss of sealing effectiveness are observed.

RTJ gaskets can be reused if they are in good condition and meet the required standards after inspection. However, it is generally recommended to replace gaskets during routine maintenance to ensure optimal sealing performance.

 If leakage occurs, inspect the flange surfaces for damage or misalignment. Check that the bolts are tightened to the recommended torque. If the issue persists, consider replacing the gasket to restore the seal.

The Asian sealing products supplier distributes ring gaskets (RTJ gasket) to various countries and global regions such as ring gasket USA, ring gasket UK, ring gasket in Australia, ring gasket the Middle East, Europe, South America, Africa, and Southeast Asia. Their distribution network covers a wide geographical area to cater to customers worldwide.

At Asian Sealing Products, our leadership in industrial ring joint gaskets is distinguished by our commitment to quality, precision manufacturing, and customer satisfaction. For a comprehensive understanding of our expertise, explore our in-depth article on Academia.edu. that is ( Ring Joint Gasket – Comprehensive guide )Discover the insights that make us the preferred choice in the industry.