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AN818-2
Aeronautical Standard Tube Coupling Nut
Description
Coupling Nut
Specifications
| Connection Type | Flared Tube |
|---|---|
| Diameter A | 0.180 in |
| Diameter C | 0.375 in |
| Dimension A Tolerance | +0.003 in |
| Dimension C Tolerance | +0.000 in |
| Dimension J | 0.312 in |
| Dimension M | 0.542 in |
| Dimension M Tolerance | +0.005 in |
| Dimension O | 0.375 in |
| Dimension O Tolerance | -0.004 in |
| Industry Standards/Certification | AN818 |
| Material | Steel |
| Material Specification | Qq-s-637 federal specification single material response |
| NIIN | 00-287-0294 |
| NSN | 4730-00-287-0294 |
| Nut Height | 0.531 |
| Nut Style | Tube coupling |
| Size No. Alum | 2D |
| Size No. SS | 2J |
| Size No. Steel | 2 |
| Special Features | Grumman a-10 aircraft |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Class 2 federal specification single treatment response type 2 qq-p-416 |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series | Unf (fine thread) |
| Thread Size | 0.312, 5/16-24 |
| Thread T (MIL-S-8879) | 0.3125-24 |
| Tube O.D. | 1/8 |
| Tube Outside Diameter | 0.125 in |
| Weight | 0.01 lb |
| Width Across Flats | Between 0.371 inches and 0.378 inches |
Cross-reference
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Catalog data updated 2026-07-05. Report a data error