The Coupling,tube, cataloged under National Stock Number 4730-01-375-0320, 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 Air Cruisers Company, Llc. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-375-0320 |
| Primary Part Number | C28509-1 |
| Item Name | Coupling,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Air Cruisers Company, Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE I MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | CRIMPED (TUBE) SECOND END |
| Connection Style | PLAIN (TUBE) FIRST END |
| Nominal Overall Length | 3.370 INCHES IN |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | PLAIN |
| Nominal Outside Diameter Tube Accommodated | 3.750 INCHES ALL ENDS IN |
| Surface Treatment | ANODIZE OVERALL |
| Material | ALUMINUM ALLOY 6061 OVERALL |
| 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 |
|---|---|
| C28509-1 PRIMARY | Air Cruisers Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| C28509 | D/9 Drawing number reference only Air Cruisers Company, Llc |
NSN 4730-01-375-0320 is a Coupling,tube, manufactured by Air Cruisers Company, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-375-0320 has 1 manufacturer part number on file: C28509-1 (Air Cruisers Company, Llc).
Key specifications for C28509-1: Surface Treatment Document and Classification: MIL-A-8625,TYPE I MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: CRIMPED (TUBE) SECOND END; Connection Style: PLAIN (TUBE) FIRST END; Nominal Overall Length: 3.370 INCHES IN. 9 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.