The Tee,pipe, cataloged under National Stock Number 4730-00-256-3665, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-256-3665 |
| Item Name | Tee,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) ALL ENDS |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED INTERNAL PIPE SECOND END |
| Connection Type | THREADED INTERNAL PIPE THIRD END |
| Material Document and Classification | ASTM A126 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Operating Pressure | 125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Operating Pressure | 175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Leg Length | 1.500 INCHES NOMINAL SECOND END IN |
| Leg Length | 1.580 INCHES NOMINAL FIRST END IN |
| Leg Length | 1.670 INCHES NOMINAL THIRD END IN |
| Nominal Thread Size | 1.250 INCHES FIRST END IN |
| Nominal Thread Size | 1.000 INCHES THIRD END IN |
| Nominal Thread Size | 1.000 INCHES SECOND END IN |
| Nondefinitive Spec/std Data | 1 TYPE AND A CLASS |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Material | IRON OVERALL |
| Thread Series Designator | NPT THIRD END |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| ASME B16.4 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
| WWP501ANDTYPE1ANDCLASSA | 5/9 Secondary reference U.S. Government activity |
| WWP501TYPE1CLASSA | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-256-3665 is a Tee,pipe, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
6 possible matches (shared part number, not a government interchangeability claim): 4730-00-273-9396, 4730-00-287-0196, 4730-00-287-0726. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-256-3665: Connection Style: PLAIN (PIPE) ALL ENDS; Connection Type: THREADED INTERNAL PIPE FIRST END; Connection Type: THREADED INTERNAL PIPE SECOND END; Connection Type: THREADED INTERNAL PIPE THIRD END. 20 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.