The Seat,valve, cataloged under National Stock Number 4820-00-903-4337, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Elliott Company Div Jeannette. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-903-4337 |
| Primary Part Number | 638212-2 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Elliott Company Div Jeannette |
| Status | ACTIVE |
| Material Document and Classification | FED STD 66 FED STD 1ST MATERIAL RESPONSE OR AISI 416/SAE 51416 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 1.375 INCHES SINGLE THREADED PORTION IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 16 SINGLE THREADED PORTION |
| Material | STEEL OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 638212PC2 | Elliott Company Div Jeannette (USA) |
| 638212-2 PRIMARY | Elliott Company Div Jeannette (USA) |
| 8R0003ITEM3-9 | Elliott Company Div Jeannette (USA) |
| Reference | Meaning |
|---|---|
| Z638212PC2 | 5/9 Secondary reference Elliott Company Div Jeannette |
| BWW-0067ITEM3-9 | 5/9 Secondary reference Elliott Company Div Jeannette |
NSN 4820-00-903-4337 is a Seat,valve, manufactured by Elliott Company Div Jeannette, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-903-4337 has 3 manufacturer part numbers on file: 638212PC2 (Elliott Company Div Jeannette), 638212-2 (Elliott Company Div Jeannette), 8R0003ITEM3-9 (Elliott Company Div Jeannette).
1 possible match (shared part number, not a government interchangeability claim): 2825-01-051-5115. Verify interchangeability with system specifications before substitution.
Key specifications for 638212-2: Material Document and Classification: FED STD 66 FED STD 1ST MATERIAL RESPONSE OR AISI 416/SAE 51416 ASSN STD 2ND MATERIAL RESPONSE OVERALL; Nominal Thread Size: 1.375 INCHES SINGLE THREADED PORTION IN; Surface Treatment: PASSIVATE OVERALL; Thread Class: 3A SINGLE THREADED PORTION A. 9 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.