As listed
| Field | Value |
|---|---|
| Seller | Aircraft Spruce |
| Standard | AN816 |
| Form | Straight nipple, flared tube × pipe thread |
| 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.
The thread column is the pipe-thread end. Not every size exists in every material: "--" marks the gaps.
Sizes listed
| Steel | Aluminum | Stainless | Tube OD (in.) | Pipe thread |
|---|---|---|---|---|
| 2 | 2D | -- | 1/8 | 1/8 |
| 3 | 3D | -- | 3/16 | 1/8 |
| 4 | 4D | 4J | 1/4 | 1/8 |
| 4-4 | 4-4D | -- | 1/4 | 1/4 |
| 5 | 5D | -- | 5/16 | 1/8 |
| 6 | 6D | -- | 3/8 | 1/4 |
| 6-2 | 6-2D | -- | 3/8 | 1/8 |
| 6-6 | 6-6D | -- | 3/8 | 3/8 |
| 7 | 7D | -- | 1/2 | 1/4 |
| 8 | 8D | -- | 1/2 | 3/8 |
| 10 | 10D | -- | 5/8 | 1/2 |
| 16 | -- | -- | 3/4 | 1-1/16-12 |
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.
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Sources
- Aircraft Spruce — AN816 Nipple, Flared Tube to Pipe Thread — product listing, checked 2026-09-30.