The Tee,tube to Boss, cataloged under National Stock Number 4730-00-222-0146, 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 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-222-0146 |
| Primary Part Number | 2256728PC4 |
| Item Name | Tee,tube to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-16232,TY Z,CL 4C MIL SPEC SINGLE TREATMENT RESPONSE INSIDE |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END |
| Connection Style | GASKET SEAL, COMPRESSION (TUBE) FIRST END |
| Connection Style | GASKET SEAL, COMPRESSION (TUBE) THIRD END |
| Connection Type | THREADED EXTERNAL TUBE THIRD END |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES THIRD END IN |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES FIRST END IN |
| Operating Pressure | 2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Leg Length | 1.468 INCHES NOMINAL FIRST END IN |
| Leg Length | 1.438 INCHES NOMINAL SECOND END IN |
| Leg Length | 1.468 INCHES NOMINAL THIRD END IN |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Thread Class | 2A ALL ENDS A |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF ALL ENDS |
| 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 |
|---|---|
| 2256728PC4 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| 2256728 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| A750-8 | 5/1 Secondary reference U.S. Government activity |
NSN 4730-00-222-0146 is a Tee,tube to Boss, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-222-0146 has 2 manufacturer part numbers on file: 2256728PC4 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 2256728 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 5895-00-564-5722. Verify interchangeability with system specifications before substitution.
Key specifications for 2256728PC4: Surface Treatment Document and Classification: MIL-C-16232,TY Z,CL 4C MIL SPEC SINGLE TREATMENT RESPONSE INSIDE; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END; Connection Style: GASKET SEAL, COMPRESSION (TUBE) FIRST END; Connection Style: GASKET SEAL, COMPRESSION (TUBE) THIRD END. 18 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.