The Restrictor Unit,fluid Flow, cataloged under National Stock Number 4730-01-535-6415, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-535-6415 |
| Primary Part Number | 801-6640811 ASSY 263 |
| Item Name | Restrictor Unit,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flow Rate and Fluid Type | 365.0 GALLONS PER MINUTE WATER |
| Strainer Type and Quantity | 134 PERFORATED PLATES |
| Design Type | STRAIGHT |
| Criticality Code Justification | FEAT |
| Material Document and Classification | QQ-N-281, CLASS A FED SPEC SINGLE MATERIAL RESPONSE LOCATION NOT OTHERWISE SPECIFIED |
| Diameter | 12.210 INCHES NOMINAL IN |
| Valve Size | 12.000 INCHES IN |
| Material | NICKEL ALLOY 400 BODY |
| End Connection Similarity | NOT IDENTICAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 801-6640811 ASSY 263 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2633-561-01-263 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-535-6415 is a Restrictor Unit,fluid Flow, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-535-6415 has 1 manufacturer part number on file: 801-6640811 ASSY 263 (Naval Sea Systems Command).
Key specifications for 801-6640811 ASSY 263: Flow Rate and Fluid Type: 365.0 GALLONS PER MINUTE WATER; Strainer Type and Quantity: 134 PERFORATED PLATES; Design Type: STRAIGHT; Criticality Code Justification: FEAT. 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.