The Seat,valve, cataloged under National Stock Number 4820-00-005-7407, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Grimes Aerospace Company. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-005-7407 |
| Primary Part Number | 383V318 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Grimes Aerospace Company |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.154 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN |
| Flange Diameter | 0.620 INCHES MINIMUM AND 0.624 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.556 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.154 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Under Flange Height | 0.127 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 383V318 PRIMARY | Grimes Aerospace Company (USA) |
| Reference | Meaning |
|---|---|
| 383V318 | 5/9 Secondary reference Grimes Aerospace Co |
NSN 4820-00-005-7407 is a Seat,valve, manufactured by Grimes Aerospace Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-005-7407 has 1 manufacturer part number on file: 383V318 (Grimes Aerospace Company).
Key specifications for 383V318: Flange Seat to Disk End Height: 0.154 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN; Flange Diameter: 0.620 INCHES MINIMUM AND 0.624 INCHES MAXIMUM IN; Body Outside Diameter: 0.556 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 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.