As listed
| Field | Value |
|---|---|
| Seller | Aircraft Spruce |
| Standard | AN821 |
| Form | 90° elbow, flared tube both ends |
| Listing checked | 2026-09-30 |
Taken from Aircraft Spruce's product page on 2026-09-30. Where the listing does not state a figure, this table does not either.
What it is for
The dash number is the tube outside diameter in sixteenths (−4 = 1/4"). A "D" suffix is aluminum, "J" stainless, no suffix steel, as the listing's columns show.
For a pipe-threaded port use the AN822.
Sizes listed
| Steel | Aluminum | Tube OD (in.) | Thread |
|---|---|---|---|
| 2 | 2D | 1/8 | 5/16-24 |
| 3 | 3D | 3/16 | 3/8-24 |
| 4 | 4D | 1/4 | 7/16-20 |
| 5 | 5D | 5/16 | 1/2-20 |
| 6 | 6D | 3/8 | 9/16-18 |
| 8 | 8D | 1/2 | 3/4-16 |
| 10 | 10D | 5/8 | 7/8-14 |
| 12 | 12D | 3/4 | 1-1/16-12 |
| 16 | 16D | 1 | 1-5/16-12 |
As listed by Aircraft Spruce on 2026-09-30. Check the live listing before ordering: stock and part numbers change.
Where to buy
The link opens Aircraft Spruce's own page for this item, so the price and stock you see are theirs and current. We do not copy prices.
The Aviation Point links to third-party manufacturer and distributor websites. We may earn a commission on purchases made through these links, at no additional cost to you. The Aviation Point has no partnership or affiliate agreement with Aircraft Spruce, and these links carry no tracking parameters.
Sources
- Aircraft Spruce — AN821 90° Elbow, Flared Tube — product listing, checked 2026-09-30.