18 inch MSS SP-44 Class 300 Flange Dimensions
18 inch (DN 450) to MSS SP-44: OD 28.00 in; thickness 2.38 in; hub 21.00 in; length 6.25 in; raised face 21.00 in.
Key to dimensions
- O
- Outside diameter of flange
- tf
- Minimum flange thickness
- X
- Hub diameter at base
- Y
- Length through hub
- R
- Raised face diameter
- W
- Bolt circle diameter
- Bolts
- Number of bolts
- Hole
- Bolt hole diameter
- Bolt
- Bolt diameter
18 inch MSS SP-44 Class 300 Flange Dimensions — all dimensions
MSS SP-44 Class 300 weld neck / blind flange dimensions (inches)
| Dimension | Value | Equivalent |
|---|---|---|
| Flange OD — O | 28.00 in | 711.2 mm |
| Min. thickness — tf | 2.38 in | 60.5 mm |
| Hub dia — X | 21.00 in | 533.4 mm |
| Length thru hub — Y | 6.25 in | 158.8 mm |
| Raised face — R | 21.00 in | 533.4 mm |
| Bolt circle — W | 24.75 in | 628.6 mm |
| Number of bolts | 24 | |
| Dia — Hole | 1.38 in | 35.1 mm |
| Bolt size | 1-1/4 |
Values are nominal, from MSS SP-44 Class 300 Flange Dimensions. Verify critical dimensions against the current edition of the standard before design, purchase or fabrication.
Find another size or standard
Pick a product, standard and size — or just type — to see every dimension and download a watermarked PDF for that one size.
Other sizes — MSS SP-44 Class 300 Flange Dimensions
Same size in other ratings
Related for this size
18" Stud Bolt Chart for ASME B16.5 Flanges
Same size — open the dimensions page.
View online · PDFASME B16.2018" ASME B16.20 Spiral Wound Gasket Dimensions
Same size — open the dimensions page.
View online · PDFASME B16.2118" ASME B16.21 Non-Metallic Flat Gasket Dimensions
Same size — open the dimensions page.
View online · PDFASME B36.10M18" Pipe Schedule Chart — ASME B36.10M
Same size — open the dimensions page.
View online · PDFFAQ
18 inch MSS SP-44 Class 300 Flange Dimensions: common questions
What are the 18 inch MSS SP-44 Class 300 Flange Dimensions?
18 inch (DN 450) to MSS SP-44: OD 28.00 in; thickness 2.38 in; hub 21.00 in; length 6.25 in; raised face 21.00 in.
Does Teshi Group manufacture 18 inch flanges?
Yes. Teshi Group is an OEM manufacturer in India of flanges to MSS SP-44, in carbon, alloy, stainless, duplex, super duplex, nickel alloys, titanium and Cu-Ni, with EN 10204 3.1 certificates.
Can I download the 18 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 MSS SP-44 Class 300 Flange Dimensions chart.
Need 18 inch flanges?
Teshi Group manufactures them in India — send your size, rating and material and get a quote in 24–48 hours.
Ready to build to spec?
Share your drawing, bill of materials or technical requirements with the Teshi team.