JIS B2220 Stainless Steel Flanges (SS400, SUS304, SUS316)
Sunhyings is a premier manufacturer and supplier of JIS B2220 (Japanese Industrial Standards) flanges in China. We specialize in producing high-precision stainless steel flanges including JIS 5K, 10K, 16K, 20K, and 30K pressure ratings.
Engineered for durability and precision, our flanges are manufactured from premium Stainless Steel (SUS304, SUS316, SUS316L) and Carbon Steel (SS400), strictly adhering to the JIS B 2220:2012 standard. Whether you need standard Slip-On (SOP), Blind, or Weld Neck flanges for waterworks, shipbuilding, or petrochemical applications, we provide full material traceability and inspection reports.
Types of JIS B2220 Flanges We Supply
Stainless Steel Flanges
By Design Type
By Standard & Class
Advanced Materials
Why Choose Our JIS Flanges?
We don't just claim quality; we prove it. Our manufacturing process is backed by rigorous data and laboratory testing to ensure safety and precision.
JIS B2220 Precision
- CNC Machined: Sealing surface flatness tolerance within 0.05mm.
- Perfect Alignment: Bolt hole (PCD) accuracy within ±0.5mm for hassle-free installation.
100% Traceability
- PMI Testing: Every batch is spectrographically analyzed before production.
- Documentation: Shipped with EN10204-3.1 MTC, verifying chemical & mechanical properties.
1.5x Safety Factor
- Hydrostatic Testing: 10K flanges tested at 1.5 Mpa (standard requires 1.0 Mpa).
- Performance: Guaranteed leak-free under standard water hammer or pressure surges.
Supply Reliability
- Huge Inventory: 500+ Tons of stock ready for 48-hour dispatch.
- Quality Record: Global return rate maintained below 0.02% over the last 3 years.
What is JIS Flange?
JIS flange is a pipe flange manufactured to Japanese Industrial Standards (JIS), most commonly JIS B2220. It is used to connect pipes, valves, and pumps in industrial systems. JIS flanges are widely used in Japan and many Asian markets and are not directly interchangeable with ANSI/ASME or DIN flanges due to different dimensions and pressure ratings.
Key specs
Pressure class (K): 5K, 10K, 16K, 20K
10K ≈ 1.0 MPa (~10 kgf/cm², ~145 psi)
Common types: SOP, SOH, WN, Blind
System: Metric, often matched with JIS pipe sizes
| Feature | Specification Details |
| Standard | JIS B 2220 : 2012 (Steel Pipe Flanges) |
| Pressure Ratings | 5K, 10K, 16K, 20K, 30K, 40K, 63K |
| Size Range | 10A (3/8″) to 1500A (60″) |
| Material Grades | Stainless Steel: SUS 304, SUS 304L, SUS 316, SUS 316L Carbon Steel: SS400, SF440A |
| Facing Types | Flat Face (FF), Raised Face (RF), Male/Female (MF), Tongue & Groove (TG) |
| Surface Treatment | Anti-rust Oil, Transparent Paint, Hot Dipped Galvanized (upon request) |
JIS B2220 Flange Dimensions & Standard Charts
Find the detailed measurements for standard JIS flanges below, including bolt size and weights.
JIS 5K Flange Dimensions
JIS 5K flanges are typically used for low-pressure applications such as water piping, exhaust lines, and general utility services. They are lighter and more cost-effective than 10K flanges.
| Nominal Size (DN) | Pipe O.D. (mm) | Flange O.D. (mm) | Bolt Circle Dia (BCD) | Bolt Holes (No. x Dia) | Bolt Thread (M) | Weight (SOP) kg |
|---|---|---|---|---|---|---|
| 15A | 21.7 | 80 | 60 | 4 x 12 | M10 | 0.5 |
| 20A | 27.2 | 85 | 65 | 4 x 12 | M10 | 0.6 |
| 25A | 34.0 | 95 | 75 | 4 x 12 | M10 | 0.8 |
| 32A | 42.7 | 115 | 90 | 4 x 15 | M12 | 1.2 |
| 40A | 48.6 | 120 | 95 | 4 x 15 | M12 | 1.3 |
| 50A | 60.5 | 130 | 105 | 4 x 15 | M12 | 1.6 |
| 65A | 76.3 | 155 | 130 | 4 x 15 | M12 | 2.3 |
| 80A | 89.1 | 180 | 145 | 4 x 19 | M16 | 3.3 |
| 100A | 114.3 | 200 | 165 | 8 x 19 | M16 | 3.8 |
| 125A | 139.8 | 235 | 200 | 8 x 19 | M16 | 5.1 |
| 150A | 165.2 | 265 | 230 | 8 x 19 | M16 | 7.0 |
| 200A | 216.3 | 320 | 280 | 8 x 23 | M20 | 10.3 |
| 250A | 267.4 | 385 | 345 | 12 x 23 | M20 | 14.8 |
| 300A | 318.5 | 430 | 390 | 12 x 23 | M20 | 20.8 |
Note: 5K flanges often share bolt patterns with 10K in smaller sizes (under 25A), but diverge significantly in larger diameters. Always check the BCD.
JIS 10K Flange Dimensions
JIS 10K flanges are the industry standard for medium-pressure applications in Asian markets. Widely used in oil, gas, and water systems, the 10K specification offers a balanced combination of durability and cost-efficiency. Below are the standard dimensions for Slip-On (SOP) and Blind flanges.
| Nominal Size (DN) | Pipe O.D. (mm) | Flange O.D. (mm) | Bolt Circle Dia (BCD) | Bolt Holes (No. x Dia) | Bolt Thread (M) | Weight (SOP) kg |
|---|---|---|---|---|---|---|
| 10A | 17.3 | 90 | 65 | 4 x 15 | M12 | 0.6 |
| 15A | 21.7 | 95 | 70 | 4 x 15 | M12 | 0.7 |
| 20A | 27.2 | 100 | 75 | 4 x 15 | M12 | 0.8 |
| 25A | 34.0 | 125 | 90 | 4 x 19 | M16 | 1.1 |
| 32A | 42.7 | 135 | 100 | 4 x 19 | M16 | 1.6 |
| 40A | 48.6 | 140 | 105 | 4 x 19 | M16 | 1.7 |
| 50A | 60.5 | 155 | 120 | 4 x 19 | M16 | 2.1 |
| 65A | 76.3 | 175 | 140 | 4 x 19 | M16 | 2.8 |
| 80A | 89.1 | 185 | 150 | 8 x 19 | M16 | 3.0 |
| 100A | 114.3 | 210 | 175 | 8 x 19 | M16 | 3.7 |
| 125A | 139.8 | 250 | 210 | 8 x 23 | M20 | 6.0 |
| 150A | 165.2 | 280 | 240 | 8 x 23 | M20 | 7.4 |
| 200A | 216.3 | 330 | 290 | 12 x 23 | M20 | 10.3 |
| 250A | 267.4 | 400 | 355 | 12 x 25 | M22 | 16.2 |
| 300A | 318.5 | 445 | 400 | 16 x 25 | M22 | 19.8 |
| 350A | 355.6 | 490 | 445 | 16 x 25 | M22 | 29.5 |
| 400A | 406.4 | 560 | 510 | 16 x 27 | M24 | 40.5 |
Note: The JIS 10K 50A flange uses 4 bolts, whereas ANSI 150 2″ uses 4 bolts, but the Bolt Circle Diameter differs (120mm vs 120.7mm), making them incompatible without modification.
JIS 16K Flange Dimensions
JIS 16K flanges bridge the gap between medium and high-pressure systems. They are frequently found in steam lines and specific marine engineering applications where 10K is insufficient but 20K is overkill.
| Nominal Size (DN) | Pipe O.D. (mm) | Flange O.D. (mm) | Bolt Circle Dia (BCD) | Bolt Holes (No. x Dia) | Bolt Thread (M) | Weight (SOP) kg |
|---|---|---|---|---|---|---|
| 15A | 21.7 | 95 | 70 | 4 x 15 | M12 | 0.9 |
| 20A | 27.2 | 100 | 75 | 4 x 15 | M12 | 1.1 |
| 25A | 34.0 | 125 | 90 | 4 x 19 | M16 | 1.6 |
| 32A | 42.7 | 135 | 100 | 4 x 19 | M16 | 2.0 |
| 40A | 48.6 | 140 | 105 | 4 x 19 | M16 | 2.1 |
| 50A | 60.5 | 155 | 120 | 8 x 19 | M16 | 2.7 |
| 65A | 76.3 | 175 | 140 | 8 x 19 | M16 | 3.8 |
| 80A | 89.1 | 200 | 160 | 8 x 23 | M20 | 5.1 |
| 100A | 114.3 | 225 | 185 | 8 x 23 | M20 | 6.5 |
| 125A | 139.8 | 270 | 225 | 8 x 25 | M22 | 9.5 |
| 150A | 165.2 | 305 | 260 | 12 x 25 | M22 | 12.7 |
| 200A | 216.3 | 350 | 305 | 12 x 25 | M22 | 16.5 |
| 250A | 267.4 | 430 | 380 | 12 x 27 | M24 | 26.8 |
| 300A | 318.5 | 480 | 430 | 16 x 27 | M24 | 35.5 |
JIS 20K Flange Dimensions
JIS 20K flanges are heavy-duty components designed for high-pressure environments, such as hydraulic lines and high-temperature steam systems. They feature thicker faces and larger bolting requirements.
| Nominal Size (DN) | Pipe O.D. (mm) | Flange O.D. (mm) | Bolt Circle Dia (BCD) | Bolt Holes (No. x Dia) | Bolt Thread (M) | Weight (SOP) kg |
|---|---|---|---|---|---|---|
| 15A | 21.7 | 95 | 70 | 4 x 15 | M12 | 1.0 |
| 20A | 27.2 | 100 | 75 | 4 x 15 | M12 | 1.2 |
| 25A | 34.0 | 125 | 90 | 4 x 19 | M16 | 1.8 |
| 32A | 42.7 | 135 | 100 | 4 x 19 | M16 | 2.3 |
| 40A | 48.6 | 140 | 105 | 4 x 19 | M16 | 2.5 |
| 50A | 60.5 | 155 | 120 | 8 x 19 | M16 | 3.0 |
| 65A | 76.3 | 175 | 140 | 8 x 19 | M16 | 4.2 |
| 80A | 89.1 | 200 | 160 | 8 x 23 | M20 | 6.0 |
| 100A | 114.3 | 225 | 185 | 8 x 23 | M20 | 7.8 |
| 125A | 139.8 | 270 | 225 | 8 x 25 | M22 | 12.5 |
| 150A | 165.2 | 305 | 260 | 12 x 25 | M22 | 17.0 |
| 200A | 216.3 | 350 | 305 | 12 x 25 | M22 | 22.5 |
| 250A | 267.4 | 430 | 380 | 12 x 27 | M24 | 35.0 |
| 300A | 318.5 | 480 | 430 | 16 x 27 | M24 | 46.5 |
Technical Note: For sizes above 300A or higher pressures (30K, 40K, 63K), please contact our engineering department for detailed drawings.
FAQ
What is the difference between JIS and ANSI flanges?
The primary difference between JIS (Japanese Industrial Standards) and ANSI (American National Standards Institute) flanges lies in their dimensions and pressure ratings, making them not interchangeable. Even for the same pipe size (e.g., 4 inch / 100A), the Bolt Circle Diameter (BCD) and flange outer diameter differ, preventing them from bolting together safely.
Detailed Engineering Comparison: While both standards control flange specifications, they originate from different systems: JIS B2220 (Metric/Japan) and ASME B16.5 (Imperial/USA).
Critical Dimensional Mismatch (Example: 4 Inch vs. 100A) Attempts to mate a JIS 10K flange with an ANSI Class 150 flange will fail due to bolt hole misalignment.
| Feature | JIS 10K 100A Flange | ANSI Class 150 4″ Flange |
| Standard | JIS B2220 | ASME B16.5 |
| Outer Diameter (OD) | 210 mm | 228.6 mm (9.00″) |
| Bolt Circle Diameter (BCD) | 175 mm | 190.5 mm (7.50″) |
| Number of Bolts | 8 | 8 |
| Bolt Hole Diameter | 19 mm | 19.1 mm (0.75″) |
| Pressure Rating | ~142 PSI (10 kgf/cm²) | ~285 PSI (Class 150 rating) |
Safety Warning: Never attempt to force a connection between JIS and ANSI flanges by re-drilling or bending bolts. The BCD difference of over 15mm (in the 4-inch example) compromises the structural integrity of the joint, leading to inevitable leakage and potential safety hazards. Always use the correct standard or a specially engineered adapter.
What does "10K" mean in JIS flanges?
In JIS flanges, “10K” refers to the nominal pressure rating of 10 kgf/cm² (Kilogram-force per square centimeter). It indicates the flange is designed to withstand a working pressure of approximately 1.0 MPa or 10 Bar at ambient temperatures.
Precise Unit Conversion: For engineers using modern international standards, here is the exact conversion for JIS 10K pressure :
10 kgf/cm² ≈ 0.98 MPa (often rounded to 1.0 MPa for simplicity)
10 kgf/cm² ≈ 9.8 Bar (often rounded to 10 Bar)
10 kgf/cm² ≈ 142 PSI
Temperature Derating Factor: It is critical to note that “10K” represents the pressure capacity at ambient temperature (typically up to 120°C). As the fluid temperature increases, the maximum allowable working pressure decreases. For example, at 300°C, the working pressure of a carbon steel JIS 10K flange drops significantly below 10 kgf/cm². Always consult the Pressure-Temperature Ratings table in JIS B2220 before selecting flanges for high-temperature steam or oil applications.
Can Sunhyings manufacture custom JIS flanges?
Yes, Sunhyings specializes in manufacturing custom JIS flanges and precision pipe fittings. Beyond standard JIS B2220 dimensions (5K, 10K, 16K, 20K), we provide OEM/ODM services tailored to specific project requirements, including special materials, non-standard dimensions, and complex geometries.
Our Manufacturing Capabilities: We ensure every custom order meets rigorous industrial standards through our accredited manufacturing process:
Size Range: From small bore DN10 to large diameter DN2000 flanges.
Materials: We process a wide range of materials including Stainless Steel (304/304L, 316/316L), Carbon Steel, and Duplex Steels.
Precision Machining: Utilizing 5-axis CNC machining centers and high-precision forging lines to ensure exact tolerances for seal faces and bolt holes.
Quality Assurance:
ISO 9001:2015 Certified Quality Management System.
PED 2014/68/EU (Pressure Equipment Directive) compliant for the European market.
EN 10204 3.1 Certification: Every shipment includes a Mill Test Certificate (MTC) verifying chemical composition and mechanical properties.
Contact Our Engineering Team: Located in Wenzhou, the heart of China’s valve and fitting industry, we are ready to review your technical drawings. Contact us at anna@sunhying.com or call +86 15868721920 for a technical consultation or rapid quotation.