The Union,pipe, cataloged under National Stock Number 4730-00-902-0158, 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 Flagg Stanley G & Co Inc Dba Flagg Brass. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-902-0158 |
| Primary Part Number | 4401-250 |
| Item Name | Union,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Flagg Stanley G & Co Inc Dba Flagg Brass |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 1.250 INCHES FIRST END IN |
| Connection Style | PLAIN (PIPE) FIRST END |
| Nominal Overall Length | 2.437 INCHES IN |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Seat Type | GROUND-JOINT |
| Nominal Thread Size | 1.250 INCHES FIRST END IN |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Material | COPPER ALLOY OVERALL |
| Material | COPPER ALLOY SEAT |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 4401-250 PRIMARY | Flagg Stanley G & Co Inc Dba Flagg Brass (USA) |
| Reference | Meaning |
|---|---|
| 655 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4730-00-902-0158 is a Union,pipe, manufactured by Flagg Stanley G & Co Inc Dba Flagg Brass, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-902-0158 has 1 manufacturer part number on file: 4401-250 (Flagg Stanley G & Co Inc Dba Flagg Brass).
1 possible match (shared part number, not a government interchangeability claim): 7021-01-119-2224. Verify interchangeability with system specifications before substitution.
Key specifications for 4401-250: Nominal Pipe Size Accommodated: 1.250 INCHES FIRST END IN; Connection Style: PLAIN (PIPE) FIRST END; Nominal Overall Length: 2.437 INCHES IN; Connection Type: THREADED INTERNAL PIPE FIRST END. 11 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.