The Retainer,seat,valve, cataloged under National Stock Number 4820-01-423-8105, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-423-8105 |
| Primary Part Number | 803-6397434-X23XXX ITEM 20 |
| Item Name | Retainer,seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 0.478 INCHES NOMINAL IN |
| Material Document and Classification | MIL-C-24252, COMP 1, COND CA-7 MIL SPEC SINGLE MATERIAL RESPONSE |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Inside Diameter | 0.344 INCHES NOMINAL IN |
| Valve Design Control Activity | 53711 |
| Material | STEEL |
| 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 |
|---|---|
| 803-6397434-X23XXX ITEM 20 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6397434 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-423-8105 is a Retainer,seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-423-8105 has 1 manufacturer part number on file: 803-6397434-X23XXX ITEM 20 (Naval Sea Systems Command).
Key specifications for 803-6397434-X23XXX ITEM 20: Outside Diameter: 0.478 INCHES NOMINAL IN; Material Document and Classification: MIL-C-24252, COMP 1, COND CA-7 MIL SPEC SINGLE MATERIAL RESPONSE; Overall Length: 0.453 INCHES NOMINAL IN; Valve Size for Which Designed: 0.500 INCHES IN. 6 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.