The Retainer,seat,valve, cataloged under National Stock Number 4820-01-513-8571, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-513-8571 |
| Item Name | Retainer,seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Material | COPPER ALLOY |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW THE LATEST REVISION OF MIL-STD-1330 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| B3428-HP-.75CP | 3/1 Design control — primary reference Naval Inventory Control Point Mechanicsburg |
| D1400-946 ITEM 9CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| D1400-946 | D/9 Drawing number reference only Naval Inventory Control Point Mechanicsburg |
| D1400-946 ITEM 9 | 5/1 Secondary reference Custom Tooling Company |
NSN 4820-01-513-8571 is a Retainer,seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-514-2651, 4820-01-517-6643. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-513-8571: Criticality Code Justification: ZZZY; Material: COPPER ALLOY; Reference Number Differentiating Characteristics: CLEANING, PACKAGING, AND MARKING IAW THE LATEST REVISION OF MIL-STD-1330. 3 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.