JIS Standard Flanges

JIS flange standard refers to the Japanese Industrial Standard for flanges, These standards are designated under the JIS B2220 code.

Key JIS Flange Pressure Classes

Flange Type Pressure Rating (Nominal) Equivalent Pressure
5K ~5 kg/cm² ~0.5 MPa (≈ 73 psi)
10K ~10 kg/cm² ~1.0 MPa (≈ 145 psi)
16K ~16 kg/cm² ~1.6 MPa (≈ 232 psi)
20K ~20 kg/cm² ~2.0 MPa (≈ 290 psi)
30K ~30 kg/cm² ~3.0 MPa (≈ 435 psi)

Common JIS Flange Types

  • Slip-on Flange (SO)

  • Blind Flange (BL)

  • Weld Neck Flange (WN)

  • Socket Weld Flange (SW)

  • Threaded Flange (TH)

  • Lap Joint Flange (LJ)

JIS Flange Dimensions

  • Standard sizes: DN 10 to DN 1500 (½″ to 60″)

  • Bolt holes: Often differ from ANSI/ASME standards in number and spacing

  • Gasket faces: Typically flat face (FF) or raised face (RF)

  • Bolt circle diameter (BCD) and flange thickness are specific to JIS and not interchangeable with ANSI, DIN, or EN standards

Material Specifications

JIS flanges are manufactured from various materials depending on the pressure class and application:

  • Carbon Steel (SS400, SF440A, STPG370, etc.)

  • Stainless Steel (SUS304, SUS316, etc.)

  • Alloy Steel (SCM415, SCM440)

Related JIS Standards

Standard Title
JIS B2220 Steel Pipe Flanges
JIS G3101 Rolled Steels for General Structure (e.g., SS400)
JIS G3452 / G3454 Steel Pipes for Ordinary Piping

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