MSS SP-44 Class 900 Flange Dimensions
This chart gives MSS SP-44 Class 900 steel pipeline flange dimensions in inches for NPS 12 to 60 — outside diameter, minimum thickness, hub, raised face, bolt circle and bolting. MSS SP-44 flanges are made in high-yield A694 grades (F42–F70) for pipeline service.
For NPS 26 and above, MSS SP-44 dimensions are the same as ASME B16.47 Series A. Teshi Group manufactures SP-44 weld neck and blind flanges in A694 and A105 grades.
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
MSS SP-44 Class 900 Flange Dimensions — tables
MSS SP-44 Class 900 weld neck / blind flange dimensions (inches)
| NPS | OFlange OD · in | tfMin. thickness · in | XHub dia · in | YLength thru hub · in | RRaised face · in | WBolt circle · in | BoltsNo. | HoleDia · in | BoltSize · in |
|---|---|---|---|---|---|---|---|---|---|
| 12 | 24.00 | 3.12 | 16.50 | 7.88 | 15.00 | 21.00 | 20 | 1.50 | — |
| 14 | 25.25 | 3.38 | 17.75 | 8.38 | 16.25 | 22.00 | 20 | 1.62 | — |
| 16 | 27.75 | 3.50 | 20.00 | 8.50 | 18.50 | 24.25 | 20 | — | — |
| 18 | 31.00 | 4.00 | 22.25 | 9.00 | 21.00 | 27.00 | 20 | 2.00 | — |
| 20 | 33.75 | 4.25 | 24.50 | 9.75 | 23.00 | 29.50 | 20 | 2.12 | — |
| 24 | 41.00 | 5.50 | 29.50 | 11.50 | 27.25 | 35.50 | 20 | 2.62 | — |
| 26 | 42.75 | 5.50 | 30.50 | 11.25 | 29.50 | 37.50 | 20 | 2.88 | 2-3/4 |
| 28 | 46.00 | 5.62 | 32.75 | 11.75 | 31.50 | 40.25 | 20 | 3.12 | 3 |
| 30 | 48.50 | 5.88 | 35.00 | 12.25 | 33.75 | 42.75 | 20 | 3.12 | 3 |
| 32 | 51.75 | 6.25 | 37.25 | 13.00 | 36.00 | 45.50 | 20 | 3.38 | 3-1/4 |
| 34 | 55.00 | 6.50 | 39.62 | 13.75 | 38.00 | 48.25 | 20 | 3.62 | 3-1/2 |
| 36 | 57.50 | 6.75 | 41.88 | 14.25 | 40.25 | 50.75 | 20 | 3.62 | 3-1/2 |
| 38 | 57.50 | 7.50 | 42.25 | 13.88 | 43.25 | 50.75 | 20 | 3.62 | 3-1/2 |
| 40 | 59.50 | 7.75 | 44.38 | 14.31 | 45.75 | 52.75 | 24 | 3.62 | 3-1/2 |
| 42 | 61.50 | 8.12 | 46.31 | 14.62 | 47.75 | 54.75 | 24 | 3.62 | 3-1/2 |
| 44 | 64.88 | 8.44 | 48.62 | 15.38 | 50.00 | 57.62 | 24 | 3.88 | 3-3/4 |
| 46 | 68.25 | 8.88 | 50.88 | 16.18 | 52.50 | 60.50 | 24 | 4.12 | 4 |
| 48 | 70.25 | 9.19 | 52.88 | 16.50 | 54.50 | 62.50 | 24 | 4.12 | 4 |
Notes
- All dimensions are in inches (1 in = 25.4 mm).
- Class 400 and above thickness and hub length exclude the 0.25 in raised face.
- NPS 26–60 dimensions are identical to ASME B16.47 Series A; the difference is material (A694 high-yield grades).
- Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
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MSS SP-44 Class 900 Flange Dimensions — size by size
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Equivalent and related standards to MSS SP-44 Class 900 Flange Dimensions
All equivalents| Region | Standard | Relationship |
|---|---|---|
| USA | ASME B16.47 Series A Class 900 | B16.47 Series A adopted MSS SP-44 dimensions |
| China | HG/T 20623 Series A Class 900 | Large-diameter Class flanges — Series A dimensions |
| China | GB/T 9124.2 Series A Class 900 | National standard large-diameter flanges |
Teshi Group manufactures flanges and fittings to all of these standards on request, including Chinese GB / HG / SH and European EN dimensions for export projects. Always confirm bolting, facing and thickness when substituting one standard for another.
FAQ
MSS SP-44 Class 900 Flange dimensions: common questions
What is the difference between MSS SP-44 and ASME B16.47 Series A?
From NPS 26 to 60 the dimensions are the same. MSS SP-44 adds NPS 12–24 pipeline flanges and calls for high-yield A694 materials (F42–F70) matched to the line pipe grade.
What are the dimensions of a 24 inch MSS SP-44 Class 900 flange?
An NPS 24 Class 900 SP-44 flange has an outside diameter of 41.00 in, minimum thickness 5.50 in, a bolt circle of 35.50 in and 20 holes of 2.62 in.
Does Teshi Group manufacture MSS SP-44 flanges?
Yes. Teshi Group manufactures MSS SP-44 weld neck and blind flanges in India in ASTM A694 F42–F70 and A105, with 3.1 certificates.
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