The Seat,valve, cataloged under National Stock Number 4820-00-042-0874, 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 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 19 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-042-0874 |
| Primary Part Number | 2640-800X1 ITEM 17Q3 |
| 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 | ITEMS THAT SUPPORT A LEVEL I OR SUBSAFE CRITICAL SYSTEM/COMPONENT THAT HAS UNDERGONE QUALITY ASSURANCE DURING THE ACQUISITION PROCESS AND REQUIRES OBJECTIVE QUALITY EVIDENCE (OQE) TRACEABLE TO PERMANENT MARKING ON THE MATERIAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 2640-800X1 ITEM 17Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-804X3 PIECE 2Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-801X01 ITEM 17Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-852X1PC3Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-840X3PC2Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-7286652 ITEM16Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 6002-184PC3Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2643-852-10 ITEM 5Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-4558787 ITEM 18Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-801X1PC17Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 264080101-0017Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-4558791 ITEM-35Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-8543128 ITEM 5Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-801-01 ITEM 17Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 255580PC3Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 845-4558791 ITEM 35 | 5/1 Secondary reference Naval Sea Systems Command |
| 255580 PIECE 3 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 6002-184PC3 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 264080101-0017 | 5/1 Secondary reference U.S. Government activity |
| 2643-852-10 ITEM 5 | 5/1 Secondary reference U.S. Government activity |
| 2640-801X01 PIECE 17 | 5/1 Secondary reference U.S. Government activity |
| 2640-804X3 PIECE 2 | 5/1 Secondary reference U.S. Government activity |
| 2640-800X1 ITEM 17 | 5/1 Secondary reference U.S. Government activity |
| 2640-801X01 ITEM17 | 5/1 Secondary reference U.S. Government activity |
| 2643-852-10-ITEM NO-5 | 5/2 Secondary reference U.S. Government activity |
| 2640-801-01 ITEM 17 | 3/1 Design control — primary reference U.S. Government activity |
| 845-4558791 ITEM 35 | 5/1 Secondary reference U.S. Government activity |
| 2640-801X1-ITEM NO-17 | 5/2 Secondary reference U.S. Government activity |
| 2640-840X3PC2 | 5/1 Secondary reference Naval Sea Systems Command |
| 845-8543128 ITEM 5 | 5/1 Secondary reference Naval Sea Systems Command |
| 845-4558787 ITEM 18 | 5/1 Secondary reference Naval Sea Systems Command |
| 845-4558791 ITEM 35 | 5/1 Secondary reference U.S. Government activity |
| 2640-852X1PC3 | 5/1 Secondary reference Naval Sea Systems Command |
| 845-7286652 ITEM16 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-00-042-0874 is a Seat,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-042-0874 has 15 manufacturer part numbers on file: 2640-800X1 ITEM 17Q3 (Naval Inventory Control Point Mechanicsburg), 2640-804X3 PIECE 2Q3 (Naval Inventory Control Point Mechanicsburg), 2640-801X01 ITEM 17Q3 (Naval Inventory Control Point Mechanicsburg), 2640-852X1PC3Q3 (Naval Inventory Control Point Mechanicsburg), 2640-840X3PC2Q3 (Naval Inventory Control Point Mechanicsburg) and 10 more.
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-335-0663, 4820-01-545-7036. Verify interchangeability with system specifications before substitution.
Key specifications for 2640-800X1 ITEM 17Q3: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: ITEMS THAT SUPPORT A LEVEL I OR SUBSAFE CRITICAL SYSTEM/COMPONENT THAT HAS UNDERGONE QUALITY ASSURANCE DURING THE ACQUISITION PROCESS AND REQUIRES OBJECTIVE QUALITY EVIDENCE (OQE) TRACEABLE TO PERMANENT MARKING ON THE MATERIAL. 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 4820-00-042-0874 has DEMIL Code Q. 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.