The Seat,valve, cataloged under National Stock Number 4820-01-549-0955, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-549-0955 |
| Primary Part Number | 2643-820-86 ITEM 10VG |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | EQUIPMENT AND/OR PARTS REQUIRING SPECIAL MATERIAL CONTROL AND QUALITY ASSURANCE WHICH SUPPORTS SURFACE OR SUBMARINE APPLICATIONS. SPECIAL CLEANING AND PACKAGING FOR OXYGEN/HYDROGEN SERVICE IS REQUIRED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 2643-820-86 ITEM 10VG | Naval Inventory Control Point Mechanicsburg (USA) |
| 264382086-10VG | Naval Inventory Control Point Mechanicsburg (USA) |
| 7550478-264382086-10VG | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-801X1 ITEM 20VG | Naval Inventory Control Point Mechanicsburg (USA) |
| G547-0002-264382086-10VG | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-7284928 ITEM 10VG | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 845-7284928 ITEM 10 | 5/1 Secondary reference Naval Sea Systems Command |
| 7550478-264382086-10 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 264382086-10 | 5/1 Secondary reference U.S. Government activity |
| 2643-820-86 ITEM 10 | 5/1 Secondary reference U.S. Government activity |
| G547-0002-264382086-10 | 5/1 Secondary reference U.S. Government activity |
| 2640-801X1 ITEM 20 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-549-0955 is a Seat,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-549-0955 has 6 manufacturer part numbers on file: 2643-820-86 ITEM 10VG (Naval Inventory Control Point Mechanicsburg), 264382086-10VG (Naval Inventory Control Point Mechanicsburg), 7550478-264382086-10VG (Naval Inventory Control Point Mechanicsburg), 2640-801X1 ITEM 20VG (Naval Inventory Control Point Mechanicsburg), G547-0002-264382086-10VG (Naval Inventory Control Point Mechanicsburg) and 1 more.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-550-3803, 4820-01-671-6236. Verify interchangeability with system specifications before substitution.
Key specifications for 2643-820-86 ITEM 10VG: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: EQUIPMENT AND/OR PARTS REQUIRING SPECIAL MATERIAL CONTROL AND QUALITY ASSURANCE WHICH SUPPORTS SURFACE OR SUBMARINE APPLICATIONS. SPECIAL CLEANING AND PACKAGING FOR OXYGEN/HYDROGEN SERVICE IS REQUIRED. 2 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.
NSN 4820-01-549-0955 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.