The Coupling,tube, cataloged under National Stock Number 4730-00-304-3559, 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 The Boeing Company Div Defense. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-304-3559 |
| Primary Part Number | ST7M257-275L200 |
| Item Name | Coupling,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDEMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE |
| Connection Style | PLAIN (TUBE) ALL ENDSPLAIN (TUBE) ALL ENDS |
| Tubing Wall Nominal Thickness for Which Designed | 0.203 INCHES ALL ENDS IN |
| Nominal Overall Length | 2.000 INCHES IN |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDSUNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | PLAIN W/TAPERED ENDS |
| Material Document and Classification | QQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 2.750 INCHES ALL ENDS IN |
| Operating Pressure | 80.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 129.0 FAHRENHEIT SECOND RESPONSE129.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Maximum Operating Temp | 54.0 FAHRENHEIT FIRST RESPONSE54.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Surface Treatment | ANODIZE OUTSIDE |
| Surface Treatment | ANODIZE OUTSIDEANODIZE INSIDE |
| Material | ALUMINUM ALLOY 2014 OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ST7M257-275L200 PRIMARY | The Boeing Company Div Defense (USA) |
| 10A309-275-200 | Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc (USA) |
| Reference | Meaning |
|---|---|
| ST7M257-275-200 | 5/9 Secondary reference The Boeing Company Div Defense |
NSN 4730-00-304-3559 is a Coupling,tube, manufactured by The Boeing Company Div Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-304-3559 has 2 manufacturer part numbers on file: ST7M257-275L200 (The Boeing Company Div Defense), 10A309-275-200 (Rsa Engineered Products, Llc Dba Rsa Engineered Products Llc).
Key specifications for ST7M257-275L200: Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE; Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDEMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE; Connection Style: PLAIN (TUBE) ALL ENDSPLAIN (TUBE) ALL ENDS; Tubing Wall Nominal Thickness for Which Designed: 0.203 INCHES ALL ENDS IN. 15 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 4730-00-304-3559 has DEMIL Code Q. 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.