The Drag Link,back-Up Valve, cataloged under National Stock Number 4820-01-239-7527, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-239-7527 |
| Item Name | Drag Link,back-Up Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| General Characteristics Item Description | NICKEL ALLOY AMS 5664A 718 A |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 6503-86 PIECE 297 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 4457023 ITEM 297 | 3/2 Design control — primary reference U.S. Government activity |
| 4457023 | D/9 Drawing number reference only U.S. Government activity |
| 6503-86 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-239-7527 is a Drag Link,back-Up Valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 3040-01-262-4954, 5310-01-468-8759, 5365-01-613-2396. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-239-7527: General Characteristics Item Description: NICKEL ALLOY AMS 5664A 718 A. 1 specification is documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.