The Seat,valve, cataloged under National Stock Number 4820-01-506-1977, 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 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-506-1977 |
| Primary Part Number | 803-4384536-35B-86 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Taper Minor Diameter | 0.4375 INCHES NOMINAL IN |
| Material Document and Classification | ASTM B164 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A494 GR. -30C ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Taper Major Diameter | 0.5313 INCHES NOMINAL IN |
| Seat Radius | 0.2656 INCHES NOMINAL IN |
| Material | NICKEL ALLOY SEAT |
| Seat Angle in Deg | 15.000 NOMINAL |
| 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 |
|---|---|
| 803-4384536-35B-86 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 4384536 | D/9 Drawing number reference only U.S. Government activity |
| 803-4384536-35B-86 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-506-1977 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-506-1977 has 1 manufacturer part number on file: 803-4384536-35B-86 (Naval Sea Systems Command).
Key specifications for 803-4384536-35B-86: Taper Minor Diameter: 0.4375 INCHES NOMINAL IN; Material Document and Classification: ASTM B164 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A494 GR. -30C ASSN STD SINGLE MATERIAL RESPONSE SEAT; Taper Major Diameter: 0.5313 INCHES NOMINAL IN; Seat Radius: 0.2656 INCHES NOMINAL IN. 7 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.