The Elbow,pipe to Boss, cataloged under National Stock Number 4730-01-413-8290, 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 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-413-8290 |
| Primary Part Number | 6640793 ASSY 37 |
| Item Name | Elbow,pipe to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 LOCKNUT AND 1 LOCK WASHER AND 1 PREFORMED PACKING |
| Flow Angle | 90.0 DEGREES |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Connection Style | BEVELED (PIPE) FIRST END |
| Connection Style | DOUBLE THREADED SECTION W/ GASKET AND LOCKNUT SEALING (BOSS) SECOND END |
| Connection Type | BUTT WELD PIPE FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Operating Pressure | 850.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Leg Length | 2.750 INCHES NOMINAL FIRST END IN |
| Leg Length | 1.690 INCHES NOMINAL SECOND END IN |
| Nominal Thread Size | 0.562 INCHES SECOND END IN |
| Maximum Operating Temp | 85.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Thread Class | 2A SECOND END A |
| Material | NICKEL ALLOY OVERALL |
| Thread Series Designator | UNF SECOND END |
| 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 |
|---|---|
| 6640793 ASSY 37 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 801-6640793ASSY | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 6640793 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2633-021-02 PC37 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-413-8290 is a Elbow,pipe to Boss, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-413-8290 has 1 manufacturer part number on file: 6640793 ASSY 37 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-503-9968. Verify interchangeability with system specifications before substitution.
Key specifications for 6640793 ASSY 37: Furnished Items and Quantity: 1 LOCKNUT AND 1 LOCK WASHER AND 1 PREFORMED PACKING; Flow Angle: 90.0 DEGREES; Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END IN; Connection Style: BEVELED (PIPE) FIRST END. 15 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.