The Seat,valve, cataloged under National Stock Number 4820-00-987-7992, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-987-7992 |
| Primary Part Number | S4824-H-313267PC8 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Thread Length | 0.812 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 7.250 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 4A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY A OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Thread Series Designator | UNS 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 |
|---|---|
| S4824-H-313267PC8 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 3600-124PC8 | 3/2 Design control — primary reference U.S. Government activity |
| 3600-124-8 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| S4824-H-312367P | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 4820-00-987-7992 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-987-7992 has 1 manufacturer part number on file: S4824-H-313267PC8 (Naval Sea Systems Command).
Key specifications for S4824-H-313267PC8: Thread Length: 0.812 INCHES NOMINAL SINGLE THREADED PORTION IN; Material Document and Classification: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Size: 7.250 INCHES SINGLE THREADED PORTION IN; Thread Class: 4A 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.