The Support Spring,valv, cataloged under National Stock Number 4820-01-633-6312, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Support Spring,valv |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Naval Inventory Control Point Mechanicsburg (CAGE 03950) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-633-6312 |
| Primary Part Number | 284703-0001 ITEM 28D0 |
| Item Name | Support Spring,valv |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 284703-0001 ITEM 28D0 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 7550478-284703-028 | 5/1 Secondary reference Naval Sea Systems Command |
| G547-0002-284703-028D0 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| H547-0001-284703-028 | 5/1 Secondary reference U.S. Government activity |
| 175032D0 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 7383858-284703-028 | 5/1 Secondary reference U.S. Government activity |
| G547-0002-284703-028 | 5/1 Secondary reference U.S. Government activity |
| 175032 | 5/1 Secondary reference U.S. Government activity |
| H547-0001-284703-028D0 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 7550478-284703-028D0 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 284703-0001 ITEM 28 | 3/1 Design control — primary reference U.S. Government activity |
| 7383858-284703-028D0 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-633-6312 is a Support Spring,valv, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-633-6312 has 1 manufacturer part number on file: 284703-0001 ITEM 28D0 (Naval Inventory Control Point Mechanicsburg).
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4820-01-633-6312 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.