JIS B2220 Flanges Suppliers

5K to 30K Japanese Flange Standards

JIS B2220 Flanges Suppliers

JIS B2220 Standard Flanges: Dimensions | Specifications | Material Grade | Standards | About JIS B2220 Standard | All Product Types

JIS B2220 is the Japanese Industrial Standard that specifies the dimensions, pressure ratings, and tolerances for steel pipe flanges used in industrial piping systems. These flanges are widely used in industries where Japanese and Asian piping standards are preferred, such as in petrochemical plants, refineries, water treatment systems, shipbuilding, and general mechanical piping projects.

At Nutech Overseas, we manufacture and export high-performance JIS B2220 flanges in pressure classes 5K, 10K, 16K, 20K, and 30K, conforming precisely to standard specifications. Our product range includes JIS Slip-On Flanges (S/O), Blind Flanges (B), Weld Neck Flanges (W/N), Threaded Flanges (T), and Lap Joint Flanges, manufactured using high-grade stainless steel, carbon steel, and alloy steel to ensure reliable performance under diverse industrial conditions.

These flanges are manufactured with strict dimensional accuracy, ensuring smooth bolt-hole alignment, correct raised face (RF) and flat face (FF) configurations, and compatibility with JIS B2220 gaskets. All flanges undergo rigorous quality checks and testing as per industry norms, and we provide dimensional and pressure class documentation with every dispatch to meet international procurement standards.

Our JIS B2220 flanges are available from 15A to 1500A nominal size (½" to 60"), and our machining process ensures adherence to tolerances specified in JIS B2220:2004. These flanges are suitable for ANSI-compliant pipelines as well, where dual standard compatibility is required.

We also provide customization options, surface treatments like anti-rust coating, and global delivery support. Our products are regularly exported to Japan, South Korea, UAE, Vietnam, Malaysia, and other East Asian and Gulf countries, making us a reliable supplier for global JIS-standard piping projects.

JIS B2220 Flange Dimensions, Pressure Ratings (5K to 30K), Face Types, Tolerances & Bolt Circle Details.

For complete technical details, including dimensions, pressure rating classes, weight charts, sizes, tolerances, and material specifications of our JIS B2220 10K Flanges, please download the full Catalog PDF below.

Manufacturer & Exporter of Japanese Standard JIS B2220 10K & 16K Flanges for High-Performance Industrial Piping Systems.

Technical Specifications of JIS B2220 10K Flange

Specification Details
Standard JIS B2220 (Japanese Industrial Standard for Steel Pipe Flanges)
Flange Types Weld Neck, Blind, Slip-On, Threaded, Lap Joint, Socket Weld
Pressure Ratings 5K, 10K, 16K, 20K, 30K
Size Range ½″ NB to 48″ NB (DN15 to DN1200)
Face Types Raised Face (RF), Flat Face (FF)
Drilling Template As per JIS B2220 bolt circle and hole arrangement
Tolerances Machined to meet JIS dimensional and flatness tolerances
Surface Finish Stock Finish, Smooth Face, Serrated Finish (Spiral/Concentric)
Testing & Inspection Hydro Test, Dimensional Inspection, Visual QC, PMI (as per order)
Certification EN 10204 3.1 / 3.2, ISO 9001:2015, Third-Party Inspection
Applications Shipbuilding, Petrochemical, Refining, Marine, Water Supply, HVAC, Industrial Utilities
Origin Made in India (by Nutech Overseas)
Export Network USA, Europe, and Middle East

Complete Material Grade Chart - JIS B2220 16K Flanges

Material Category JIS 10K Flange Grades
Stainless Steel JIS B2220 Flange ASTM A182 F304 / F304L / F304H, F316 / F316L / F316Ti, F310, F309S, F317 / F317L, F321 / F321H, F347 / F347H, F904L, ASTM A351 CF3 / CF3M / CF8 / CF8M / CF8C, DIN 1.4301, 1.4306, 1.4307, 1.4311, 1.4401, 1.4404, 1.4408, 1.4409, 1.4541, 1.4571, 1.4550, 1.4435, 1.4539
Duplex Steel JIS B2220 Flange ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205
Super Duplex Steel JIS B2220 Flange ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760
Carbon Steel JIS B2220 Flange ASTM A105 / A105N, ASTM A350 LF2, ASTM A694 F52 / F56 / F60 / F65 / F70 / F80, ASTM A216 WCB, DIN 1.0460 / 1.0402 / 1.0619, Die Steel, Mild Steel
Alloy Steel JIS B2220 Flange ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140
Nickel Alloy JIS B2220 Flange Nickel 200 / 201, ASTM B564
Monel JIS B2220 Flange Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564
Inconel JIS B2220 Flange Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564
Incoloy JIS B2220 Flange Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564
Hastelloy JIS B2220 Flange Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564
Alloy 20 JIS B2220 Flange Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462
254 SMO JIS B2220 Flange SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182
Copper Nickel JIS B2220 Flange Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152
Copper JIS B2220 Flange TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc.
Brass JIS B2220 Flange Grades 3602, 2604, H59, H62, etc.
Aluminium JIS B2220 Flange Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc.
Titanium JIS B2220 Flange ASTM B381 Gr.1 / Gr.2 / Gr.4 / Gr.5 / Gr.7, UNS R50250 / R50400 / R50550 / R50700 / R52400 / R53400 / R56320 / R56400
Other Special Grades Al6XN, Tin Bronze, Aluminium Bronze, Lead Bronze, Nimonic 75 / 80A / 90

International Flange Standards We Manufacture & Supply

What does the “K” designation mean in JIS B2220 flange pressure ratings (e.g., 5K, 10K, 16K)?

The “K” in JIS flange pressure ratings stands for kilogram-force per square centimeter (kgf/cm²), which is a traditional Japanese unit of pressure. It defines the maximum allowable pressure the flange can handle under specified conditions.

Here’s a quick breakdown of what the ratings typically correspond to:

  • 5K ≈ 0.5 MPa or 72.5 psi
  • 10K ≈ 1.0 MPa or 145 psi
  • 16K ≈ 1.6 MPa or 232 psi
  • 20K ≈ 2.0 MPa or 290 psi
  • 30K ≈ 3.0 MPa or 435 psi

These pressure classes are vital in selecting the correct flange for different temperature, media, and application environments, especially in marine and shipbuilding industries where JIS standards are commonly used.

What are the common face types used in JIS B2220 flanges?

JIS B2220 flanges are manufactured with specific face types to ensure proper sealing and compatibility with piping systems. The most commonly used face types include:

  1. Flat Face (FF):

    This is the most widely used face type in JIS flanges, especially in low-pressure applications such as 5K and 10K. It ensures full gasket contact and uniform pressure distribution.

  2. Raised Face (RF):

    Found mostly in higher pressure classes like 16K and above, RF flanges provide better sealing by concentrating pressure on a smaller gasket area.

  3. Tongue & Groove / Male & Female Faces (on request):

    Although rare in JIS B2220, these specialized faces are used where additional sealing security is needed and can be provided on custom order.

Proper selection of the face type is crucial for gasket compatibility, leak prevention, and compliance with system requirements.

What materials are commonly used to manufacture JIS B2220 standard flanges?

JIS B2220 flanges are manufactured in various materials to meet the requirements of pressure ratings (5K to 30K), application environments, and fluid compatibility. The most commonly used materials include:

  • Carbon Steel (SS400, S20C):
    • Ideal for 5K, 10K, and 16K pressure classes.
    • Widely used in water pipelines, fire protection, and industrial utilities.
    • Economical and offers good mechanical strength.
  • Stainless Steel (SUS304, SUS316):
    • Recommended for corrosion-resistant applications like marine, chemical, and food industries.
    • Compatible with 10K to 20K pressure classes.
    • Excellent resistance to rust, acids, and saline environments.
  • Alloy Steel (SCM435, SFVC2A):
    • Used in high-pressure and high-temperature services such as power plants, refineries, and steam systems.
    • Suitable for 20K and 30K ratings.
  • Cast Iron (FC200) and Ductile Iron (FCD450):
    • Common in municipal water, HVAC, and fire service lines.
    • Mostly used for 5K and 10K pressure classes.
    • Cost-effective with reasonable strength and machinability.

These materials are selected as per application needs and are fully compliant with JIS standards. Each material offers specific mechanical and chemical properties to suit piping systems operating under different conditions.

What are the key tolerances and inspection criteria followed in JIS B2220 flange manufacturing?

JIS B2220 flanges are manufactured with strict dimensional tolerances and inspection standards to ensure proper fitment and pressure integrity in piping systems. These include:

  • Dimensional Tolerances:
    • Outer Diameter (OD) and Bolt Circle Diameter (BCD) as per JIS standards ± defined mm range.
    • Bolt Hole Diameter and Pitch Circle Accuracy to avoid misalignment during assembly.
    • Facing Height & Serration Finish: Ensures tight gasket sealing – generally concentric or spiral serration with Ra 3.2~6.3 μm.
  • Inspection Criteria:
    • Visual Inspection: For surface defects, machining marks, or warping.
    • Dimensional Inspection: Using calibrated instruments per ISO or JIS gauges.
    • Hydro Testing or Air Leak Testing: As per client specifications or pressure class.
    • Marking Verification: Ensures traceability of heat numbers, material grade, and standard compliance.

These tolerances and quality checks are critical for ensuring leak-proof operation in high-pressure Japanese industrial systems like shipbuilding, chemical, and thermal plants.

How does the JIS B2220 standard differ from other international flange standards like ASME B16.5 or EN 1092-1?

The JIS B2220 flange standard, developed for Japanese industrial applications, differs in multiple aspects from international standards like ASME B16.5 (USA) and EN 1092-1 (Europe). Here's a technical comparison:

Feature JIS B2220 ASME B16.5 EN 1092-1
Pressure Ratings 5K, 10K, 16K, 20K, 30K Class 150, 300, 600, 900, 1500, 2500 PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN400
Application Regions Primarily Japan & Asia-Pacific North America, Middle East Europe & Global Projects
Common Face Types Flat Face (FF), Raised Face (RF) RF, RTJ Type A, B, C, D (RF/FF/RTJ)
Drilling Template JIS-specific, not interchangeable ANSI B16.5 standard drilling EN standard drilling (e.g., ISO 7005-1)
Flange Thickness & Weight Generally thinner, lighter for low-pressure systems Heavier and thicker for high-pressure classes Moderate to heavy, depends on PN class
Gasket Compatibility Compressed fiber, spiral wound, metal gaskets Spiral wound, ring-type joint (RTJ) Type IBC gaskets, EN-gasket types

Conclusion: Interchangeability is not guaranteed. Always match flange standards to piping system design codes to ensure safety and compliance.

Which industries commonly use JIS B2220 flanges and why are they preferred in Asian projects?

JIS B2220 flanges are widely used across various industries in Japan and many Asia-Pacific countries due to their compatibility with regional standards and operational efficiency. These flanges are commonly preferred in:

  • Petrochemical & Refining Plants – For pipelines handling medium pressure systems (5K to 30K).
  • Water Treatment & Distribution – Due to the availability of low-pressure options like 5K and 10K.
  • Shipbuilding & Marine Applications – Japan being a global leader in marine engineering, JIS flanges are integral to piping layouts.
  • Industrial Machinery & Equipment – Where Japanese-origin machinery or design drawings mandate JIS standards.
  • Pharmaceuticals & Food Processing Units – Where the clean surface finish and precision alignment of JIS flanges are essential.

Why they are preferred:

  • Full compliance with Japanese Industrial Standards (JIS) ensures uniformity in design.
  • Easy availability of JIS-rated components across Asian markets.
  • Cost-effective for low to medium pressure applications.
  • Compatibility with Japanese and Asian-manufactured valves and pipes.

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