fittings › tube coupling nuts
AN818-4D
AN Fitting AN818-4D Nut
Description
Coupling Nut
Specifications
| Connection Type | Flared Tube |
|---|---|
| Criticality Code Justification | Feat |
| Diameter A | 0.305 in |
| Diameter C | 0.562 in |
| Dimension A Tolerance | +0.003 in |
| Dimension C Tolerance | +0.000 in |
| Dimension J | 0.400 in |
| Dimension M | 0.620 in |
| Dimension M Tolerance | +0.005 in |
| Dimension O | 0.563 in |
| Dimension O Tolerance | -0.004 in |
| Industry Standards/Certification | AN818 |
| Material | Aluminum |
| Nut Height | 0.620 |
| Nut Style | Tube coupling |
| Size No. Alum | 4D |
| Size No. SS | 4J |
| Size No. Steel | 4 |
| Special Features | Weapon system essential. grumman a-10 aircraft |
| Surface Treatment | Anodize |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series | UNF |
| Thread Size | 0.438, 7/16-20 |
| Thread T (MIL-S-8879) | 0.4375-20 |
| Tube O.D. | 1/4 |
| Tube Outside Diameter | 0.250 in |
| Weight | 0.01 lb |
| Width Across Flats | 0.563 |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- AN818-L4K AN 7/16-20 · CRES
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Catalog data updated 2026-07-05. Report a data error