Standard Flange Dimensions
ANSI B16.5 Flange Dimensions Chart - Class 150 & 300
Complete dimensional specifications for ANSI B16.5 flanges including Class 150 and Class 300 ratings. Our comprehensive flange dimensions chart covers nominal pipe sizes, bolt circle diameters, bolt hole patterns, and flange thicknesses as per American National Standards Institute specifications.
Class 150 Flanges
Standard pressure rating for low-pressure applications. Suitable for temperatures up to 400°F.
Class 300 Flanges
Higher pressure rating for medium-pressure applications. Suitable for temperatures up to 750°F.
ANSI B16.5 Standard
American standard for pipe flanges and flanged fittings from NPS 1/2 through NPS 24.
Complete ANSI B16.5 flange dimensions chart showing Class 150 and Class 300 specifications
Key Flange Dimensions
- Nominal Pipe Size (NPS): 1/2" to 24"
- Outside Diameter (OD): Varies by NPS and class
- Bolt Circle Diameter (BCD): Standard spacing
- Bolt Holes: 4 to 20 holes depending on size
- Flange Thickness: Class-specific dimensions
- Raised Face Height: 1/16" standard
Applications & Standards
- Oil & Gas Industry
- Chemical Processing
- Power Generation
- Water Treatment
- Marine Applications
- ASME B16.5 Compliant