The Nut,union, cataloged under National Stock Number 4730-01-413-7557, 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 Inventory Control Point Mechanicsburg. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-413-7557 |
| Primary Part Number | G547-0002-6397434-025-9L1 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Width Across Flats | 1.531 INCHES NOMINAL IN |
| Thread Series | UNS |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | ASTM B150 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 1.3125 INCHES IN |
| Nut Height | 0.656 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 14 |
| Material | COPPER ALLOY 632 OVERALL |
| Smallest Inside Diameter | 0.950 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| G547-0002-6397434-025-9L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 803-6397434-X1XXXX-009L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 7550478-6397434-025-9L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 7550478-6397434-025-9 | 5/1 Secondary reference Naval Sea Systems Command |
| G547-0002-6397434-025-9 | 5/1 Secondary reference U.S. Government activity |
| 803-6397434-X1XXXX-009 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4730-01-413-7557 is a Nut,union, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-413-7557 has 3 manufacturer part numbers on file: G547-0002-6397434-025-9L1 (Naval Inventory Control Point Mechanicsburg), 803-6397434-X1XXXX-009L1 (Naval Inventory Control Point Mechanicsburg), 7550478-6397434-025-9L1 (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-419-4785. Verify interchangeability with system specifications before substitution.
Key specifications for G547-0002-6397434-025-9L1: Width Across Flats: 1.531 INCHES NOMINAL IN; Thread Series: UNS; Criticality Code Justification: ZZZY; Material Document and Classification: ASTM B150 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 12 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.