12 inch ASME B16.21 Non-Metallic Flat Gasket Dimensions
12 inch (DN 300) to ASME B16.21: Inside dia 324 mm; Class 150 410 mm; Class 300 422 mm; Class 600 457 mm.
Key to dimensions
12 inch ASME B16.21 Non-Metallic Flat Gasket Dimensions — all dimensions
Flat ring gaskets for raised-face flanges (mm)
| Dimension | Value | Equivalent |
|---|---|---|
| Inside dia — ID | 324 mm | 12.76 in |
| Class 150 — OD | 410 mm | 16.14 in |
| Class 300 — OD | 422 mm | 16.61 in |
| Class 600 — OD | 457 mm | 17.99 in |
Values are nominal, from ASME B16.21 Non-Metallic Flat Gasket Dimensions. Verify critical dimensions against the current edition of the standard before design, purchase or fabrication.
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FAQ
12 inch ASME B16.21 Non-Metallic Flat Gasket Dimensions: common questions
What are the 12 inch ASME B16.21 Non-Metallic Flat Gasket Dimensions?
12 inch (DN 300) to ASME B16.21: Inside dia 324 mm; Class 150 410 mm; Class 300 422 mm; Class 600 457 mm.
Does Teshi Group manufacture 12 inch gaskets?
Yes. Teshi Group is an OEM manufacturer in India of gaskets to ASME B16.21, in carbon, alloy, stainless, duplex, super duplex, nickel alloys, titanium and Cu-Ni, with EN 10204 3.1 certificates.
Can I download the 12 inch dimensions as a PDF?
Yes. Use “Download PDF for this size” on this page to get a single-size, print-ready PDF with the drawing and every tabulated dimension, or download the full ASME B16.21 Non-Metallic Flat Gasket Dimensions chart.
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Teshi Group manufactures them in India — send your size, rating and material and get a quote in 24–48 hours.
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