JIS Flange vs ANSI Flange: Key Differences for Industrial Buyers

JIS Flange vs ANSI Flange: Key Differences for Industrial Buyers

When selecting flanges for your piping systems, choosing the right standard is crucial for compatibility, safety, and performance. Two of the most widely used flange standards are JIS (Japanese Industrial Standard) and ANSI (American National Standards Institute).

In this guide, we’ll break down the differences between JIS and ANSI flanges, helping you make an informed decision for your industrial applications.

1. What Are JIS and ANSI Flanges?

JIS Flanges (Japanese Industrial Standard)

  • Primarily used in Japan and Asian markets.

  • Follow JIS B 2220 specifications.

  • Pressure ratings in K-class (5K, 10K, 16K, 20K, 30K, 40K).

ANSI Flanges (American National Standards Institute)

  • The global standard, widely used in the U.S., Europe, and international projects.

  • Follow ANSI/ASME B16.5 & B16.47.

  • Pressure ratings in #Class (150#, 300#, 600#, 900#, etc.).

2. Key Differences Between JIS and ANSI Flanges

Feature JIS Flange ANSI Flange
Standard JIS B 2220 ANSI/ASME B16.5, B16.47
Pressure Rating 5K, 10K, 16K, 20K, 30K, 40K 150#, 300#, 600#, 900#, etc.
Bolt Hole Size Smaller Larger
Bolt Circle (PCD) Different from ANSI Standardized per ASME
Raised Face (RF) Height 3.2mm (5K/10K), 6.4mm (16K+) 1.6mm
Material Marking JIS steel grades (e.g., SS400) ASTM/ASME (e.g., A105, A182)
Compatibility Not interchangeable with ANSI Global interchangeability

3. Can JIS and ANSI Flanges Be Used Together?

❌ No, they are not directly compatible due to differences in:

  • Bolt hole spacing (PCD)

  • Flange thickness

  • Gasket seating surface

✅ Solution:

  • Use adapter flanges or custom machining.

  • Ensure proper gasket selection for sealing.

4. Which Flange Standard Should You Choose?

Choose JIS Flanges If:

✔ Your equipment is Japanese-made.
✔ Your project follows Asian industrial standards.

Choose ANSI Flanges If:

✔ You need global compatibility.
✔ Your industry follows ASME/ANSI standards (oil & gas, petrochemical, water treatment).

5. Why Buy from Us?

At [Wenzhou Zhiyuan Flange Pipe Fittings Company], we supply high-quality JIS and ANSI flanges in various materials (carbon steel, stainless steel, alloy steel).

✅ Competitive pricing
✅ Global shipping
✅ Custom machining available

📞 Contact us today for a quote!

Whatsapp:+86 13838706559
Email:[email protected]
Website:www.buyflange.com