The Ball,check, cataloged under National Stock Number 4820-01-534-9797, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-534-9797 |
| Primary Part Number | 7550478-DF330707-041, 011C1 |
| Item Name | Ball,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS AND REQUIRES CLEANING, PACKING, AND MARKING IAW MIL-STD-1 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 7550478-DF330707-041, 011C1 | Naval Inventory Control Point Mechanicsburg (USA) |
| DF330707 ITEM 41,11C1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 801-6405342 FIND 41, 11C1 | Naval Inventory Control Point Mechanicsburg (USA) |
| DF330707-041, 011C1 | Naval Inventory Control Point Mechanicsburg (USA) |
| DF330707 FIND 41, 11C1 | Naval Inventory Control Point Mechanicsburg (USA) |
| G547-0002-DF330707-041, 011C1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 801-6405342 FIND 41,11 | 5/1 Secondary reference Naval Sea Systems Command |
| DF330707 FIND 41, 11 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| DF330707 ITEM 41,11 | 3/1 Design control — primary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| G547-0002-DF330707-041, 011 | 5/1 Secondary reference U.S. Government activity |
| 7550478-DF330707-041, 011 | 5/1 Secondary reference Naval Sea Systems Command |
| DF330707-041, 011 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-534-9797 is a Ball,check, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-534-9797 has 6 manufacturer part numbers on file: 7550478-DF330707-041, 011C1 (Naval Inventory Control Point Mechanicsburg), DF330707 ITEM 41,11C1 (Naval Inventory Control Point Mechanicsburg), 801-6405342 FIND 41, 11C1 (Naval Inventory Control Point Mechanicsburg), DF330707-041, 011C1 (Naval Inventory Control Point Mechanicsburg), DF330707 FIND 41, 11C1 (Naval Inventory Control Point Mechanicsburg) and 1 more.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-537-8232. Verify interchangeability with system specifications before substitution.
Key specifications for 7550478-DF330707-041, 011C1: Criticality Code Justification: ZZZY; Part Name Assigned by Controlling Agency: BALL AND SEAT ASSEMBLY; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS AND REQUIRES CLEANING, PACKING, AND MARKING IAW MIL-STD-1. 2 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.
NSN 4820-01-534-9797 has DEMIL Code B. 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.