The Coupling,tube, cataloged under National Stock Number 4730-01-428-9921, 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 Sea Systems Command. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-428-9921 |
| Primary Part Number | 211037809 |
| Item Name | Coupling,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Nominal Width Across Flats | 1.880 INCHES ALL ENDS IN |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Nominal Length | 4.620 INCHES ALL ENDS IN |
| Nominal Overall Length | 4.620 INCHES IN |
| Connection Type | THREADED INTERNAL TUBE ALL ENDS |
| Style Designator | THREADED INTERNAL |
| Material Document and Classification | ASTMB150 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 1.880 INCHES ALL ENDS IN |
| Nominal Thread Size | 1.250 INCHES ALL ENDS IN |
| Nominal Outside Diameter | 1.880 INCHES ALL ENDS IN |
| Thread Class | 3B ALL ENDS |
| Material | NICKEL AND COPPER ALLOY AND ALUMINUM 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 |
|---|---|
| 150-6404868-30 | Naval Sea Systems Command (USA) |
| 211037809 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6404868 | D/9 Drawing number reference only Naval Sea Systems Command |
| DF2081-222 FN30 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4730-01-428-9921 is a Coupling,tube, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-428-9921 has 2 manufacturer part numbers on file: 150-6404868-30 (Naval Sea Systems Command), 211037809 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-429-2097, 3040-01-429-2701. Verify interchangeability with system specifications before substitution.
Key specifications for 211037809: Nominal Width Across Flats: 1.880 INCHES ALL ENDS IN; Connection Style: PLAIN (TUBE) ALL ENDS; Nominal Length: 4.620 INCHES ALL ENDS IN; Nominal Overall Length: 4.620 INCHES IN. 13 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.