The Head and Disk,safety,pressure Re, cataloged under National Stock Number 4820-01-424-9876, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-424-9876 |
| Primary Part Number | 1602AS239-1 |
| Item Name | Head and Disk,safety,pressure Re |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Disk Material | STEEL CORROSION RESISTING |
| Burst Pressure | 125.0 PRESSURE POUNDS PER SQUARE INCH GAGE AND 140.0 PRESSURE POUNDS PER SQUARE INCH GAGE |
| Head Type | UNION |
| Disk Type | REVERSE BUCKLING |
| Head Material | STEEL CORROSION RESISTING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1602AS239-1 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 1602AS239 | 7/1 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 4820-01-424-9876 is a Head and Disk,safety,pressure Re, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-424-9876 has 1 manufacturer part number on file: 1602AS239-1 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-432-2988. Verify interchangeability with system specifications before substitution.
Key specifications for 1602AS239-1: Disk Material: STEEL CORROSION RESISTING; Burst Pressure: 125.0 PRESSURE POUNDS PER SQUARE INCH GAGE AND 140.0 PRESSURE POUNDS PER SQUARE INCH GAGE; Head Type: UNION; Disk Type: REVERSE BUCKLING. 5 specifications are 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.