The Flange,pipe, cataloged under National Stock Number 4730-01-509-2304, 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 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-509-2304 |
| Primary Part Number | 7326208-1 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Face Seating Surface Condition | MACHINED |
| Surface Treatment Document and Classification | QQ-P-35, TY VI OR VII FED SPEC SINGLE TREATMENT RESPONSE |
| Flange Section Style | PLAIN FACE |
| Criticality Code Justification | FEAT |
| Style Designator | RECTANGULAR, WITH BOLT HOLES |
| Bolt Hole Diameter | 0.408 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A276 316L COND A ASSN STD SINGLE MATERIAL RESPONSE |
| Unthreaded Reducer Hole Diameter | 1.492 INCHES NOMINAL IN |
| Flange Length | 2.310 INCHES NOMINAL IN |
| Nominal Thread Size | 0.4375 INCHES IN |
| Reducer Flange Hole Type | CONCENTRIC |
| Bolt Hole Quantity | 5 |
| Center to Center Distance Between Bolt Holes Along Length | 1.589 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) |
| Surface Treatment | PASSIVATE |
| Center to Center Distance Between Bolt Holes Along Width | 1.589 INCHES NOMINAL IN |
| Outside Edge to Bolt Hole Center Distance Along Length | 0.361 INCHES NOMINAL IN |
| Flange Width | 2.310 INCHES NOMINAL IN |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING |
| Outside Edge to Bolt Hole Center Distance Along Width | 0.361 INCHES NOMINAL IN |
| Thickness | 1.750 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 | Y |
| Part Number | Manufacturer |
|---|---|
| 7326208-1 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7326208 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-509-2304 is a Flange,pipe, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-509-2304 has 1 manufacturer part number on file: 7326208-1 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-509-2305. Verify interchangeability with system specifications before substitution.
Key specifications for 7326208-1: Face Seating Surface Condition: MACHINED; Surface Treatment Document and Classification: QQ-P-35, TY VI OR VII FED SPEC SINGLE TREATMENT RESPONSE; Flange Section Style: PLAIN FACE; Criticality Code Justification: FEAT. 23 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.