The Union and Orifice Assembly, cataloged under National Stock Number 4730-01-090-4658, 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 2 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-090-4658 |
| Primary Part Number | 556-7551227-HE-1361L1 |
| Item Name | Union and Orifice Assembly |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| 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 B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 556-7551227-HE-1361L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| B793-8570-HE-1361L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| B793-4150-HEX-2270L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 556-7410904-HEX-2270 | Naval Sea Systems Command (USA) |
| 556-7410904-HEX-2270L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 556-7551227-HE-1361 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2621-561-02ASSY50A | 3/1 Design control — primary reference U.S. Government activity |
| B793-8570-HE-1361 | 5/1 Secondary reference U.S. Government activity |
| B793-4150-HEX-2270 | 5/2 Secondary reference U.S. Government activity |
| 2621-561-02ASSY50AL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4730-01-090-4658 is a Union and Orifice Assembly, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-090-4658 has 6 manufacturer part numbers on file: 556-7551227-HE-1361L1 (Naval Inventory Control Point Mechanicsburg), B793-8570-HE-1361L1 (Naval Inventory Control Point Mechanicsburg), B793-4150-HEX-2270L1 (Naval Inventory Control Point Mechanicsburg), 556-7410904-HEX-2270 (Naval Sea Systems Command), 556-7410904-HEX-2270L1 (Naval Inventory Control Point Mechanicsburg) and 1 more.
Key specifications for 556-7551227-HE-1361L1: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS. 2 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.
NSN 4730-01-090-4658 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.