ASME B16.9 Butt Weld Reducer Dimensions
End-to-end length of ASME B16.9 concentric and eccentric reducers in millimetres. The length H depends only on the large-end size; the table also lists the small-end sizes the standard covers for each large end.
Concentric reducers keep the pipe centreline; eccentric reducers keep one side flat, and are used on pump suctions and pipe racks. Teshi Group manufactures both as an OEM in carbon, stainless and alloy steel.
Key to dimensions
- H
- End-to-end length
ASME B16.9 Butt Weld Reducer dimensions — tables
Reducers — end-to-end length (mm)
| Large end NPSin | Small end NPS coveredin | HEnd to end |
|---|---|---|
| ¾" | ½, ⅜ | 38 |
| 1" | ¾, ½ | 51 |
| 1¼" | 1, ¾, ½ | 51 |
| 1½" | 1¼, 1, ¾, ½ | 64 |
| 2" | 1½, 1¼, 1, ¾ | 76 |
| 2½" | 2, 1½, 1¼, 1 | 89 |
| 3" | 2½, 2, 1½, 1¼ | 89 |
| 3½" | 3, 2½, 2, 1½, 1¼ | 102 |
| 4" | 3½, 3, 2½, 2, 1½ | 102 |
| 5" | 4, 3½, 3, 2½, 2 | 127 |
| 6" | 5, 4, 3½, 3, 2½ | 140 |
| 8" | 6, 5, 4, 3½ | 152 |
| 10" | 8, 6, 5, 4 | 178 |
| 12" | 10, 8, 6, 5 | 203 |
| 14" | 12, 10, 8, 6 | 330 |
| 16" | 14, 12, 10, 8 | 356 |
| 18" | 16, 14, 12, 10 | 381 |
| 20" | 18, 16, 14, 12 | 508 |
| 22" | 20, 18, 16, 14 | 508 |
| 24" | 22, 20, 18, 16 | 508 |
| 26" | 24, 22, 20, 18 | 610 |
| 28" | 26, 24, 20, 18 | 610 |
| 30" | 28, 26, 24, 20 | 610 |
| 32" | 30, 28, 26, 24 | 610 |
| 34" | 32, 30, 26, 24 | 610 |
| 36" | 34, 32, 30, 26, 24 | 610 |
| 38" | 36, 34, 32, 30, 28, 26 | 610 |
| 40" | 38, 36, 34, 32, 30 | 610 |
| 42" | 40, 38, 36, 34, 32, 30 | 610 |
| 44" | 42, 40, 38, 36 | 610 |
| 46" | 44, 42, 40, 38 | 711 |
| 48" | 46, 44, 42, 40 | 711 |
Notes
- Dimensions are in millimetres unless stated otherwise.
- Other size combinations are manufactured to order.
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.
FAQ
ASME B16.9 reducer dimensions: common questions
What is the length of an 8 x 6 inch reducer?
152 mm. Reducer length is set by the large end, so every NPS 8" reducer is 152 mm long.
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