The Valve,ball, cataloged under National Stock Number 4820-01-281-0959, 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 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-281-0959 |
| Primary Part Number | 803-5001003-A841 |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 4.438 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | QQ-C-390 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Bolt Hole Nominal Diameter | 0.688 INCHES ALL ENDS IN |
| Operating Pressure | 700.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 2.000 INCHES IN |
| Nominal Outside Diameter | 5.562 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 6 ALL ENDS |
| Face to Face Distance | 11.775 INCHES IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE PACKING |
| Material | NICKEL ALLOY STEM |
| Material | BRONZE BODY |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Material | TITANIUM FLOW CONTROL DEVICE |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 0.938 INCHES ALL ENDS IN |
| 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 |
|---|---|
| 803-5001003-A841 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 803-5001003 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-281-0959 is a Valve,ball, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-281-0959 has 1 manufacturer part number on file: 803-5001003-A841 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-496-8322, 4820-01-583-8343. Verify interchangeability with system specifications before substitution.
Key specifications for 803-5001003-A841: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 4.438 INCHES ALL ENDS IN; Connection Type: FLANGE ALL ENDS. 20 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.