The Restrictor,fluid Flow, cataloged under National Stock Number 4730-01-497-8033, 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 17 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-497-8033 |
| Primary Part Number | 801-6640811 ASSY 153-2-12 |
| Item Name | Restrictor,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Length | 14.060 INCHES NOMINAL IN |
| Thread Provision | THREADED LOCATION NOT OTHERWISE SPECIFIED |
| Design Type | PLATE |
| Thread Series | UNF SECOND PROVISION |
| Thread Series | UNF THIRD PROVISION |
| Thread Length | 0.828 INCHES NOMINAL SECOND PROVISION IN |
| Thread Length | 0.828 INCHES NOMINAL THIRD PROVISION IN |
| Thread Length | 1.680 INCHES NOMINAL FIRST PROVISION IN |
| Supplementary Features | THIS ITEM REQUIRES SHOCK QUALIFICATION IAW SECTION 072 OF NSSN CLASS SHIPS SPECIFICATIONS AND MIL-S-901D, INT. CHG, NO. 1 FOR HIGH IMPACT (HI) SHOCK. |
| Outside Diameter | 7.430 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED |
| Thread Size Designator | 0.438-20 SECOND PROVISION |
| Thread Size Designator | 0.438-20 THIRD PROVISION |
| Thread Size Designator | 3.375-16 FIRST PROVISION |
| Thread Class | 2B SINGLE PROVISION |
| Material | COPPER ALLOY 706 |
| Orifice Diameter | 0.375 INCHES NOMINAL 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 |
|---|---|
| 801-6640811 ASSY 153-2-12 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2633-561-01 | D/9 Drawing number reference only U.S. Government activity |
| 2633-561-01 ASSY 153-2-12 | 3/2 Design control — primary reference U.S. Government activity |
| 6640811 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-497-8033 is a Restrictor,fluid Flow, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-497-8033 has 1 manufacturer part number on file: 801-6640811 ASSY 153-2-12 (Naval Sea Systems Command).
Key specifications for 801-6640811 ASSY 153-2-12: Length: 14.060 INCHES NOMINAL IN; Thread Provision: THREADED LOCATION NOT OTHERWISE SPECIFIED; Design Type: PLATE; Thread Series: UNF SECOND PROVISION. 17 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.