The Union,tube, cataloged under National Stock Number 4730-01-138-6116, 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 Triumph Manufacturing Company, Inc.. Government technical data includes 19 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-138-6116 |
| Primary Part Number | 2621-791-03ASSY 10 |
| Item Name | Union,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Triumph Manufacturing Company, Inc. |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 PREFORMED PACKING |
| Connection Style | SOCKET (TUBE) ALL ENDS |
| Coupling Flange Shape | HEXAGON |
| Tubing Wall Nominal Thickness for Which Designed | 0.123 INCHES ALL ENDS IN |
| Nominal Overall Length | 2.250 INCHES IN |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | UNTHREADED |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE NUT |
| Nominal Outside Diameter Tube Accommodated | 0.562 INCHES ALL ENDS IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Seat Type | GASKET |
| Surface Treatment | PASSIVATE TAILPIECE |
| Surface Treatment | PASSIVATE THREAD PIECE |
| Media for Which Designed | HYDRAULIC FLUID SINGLE RESPONSE |
| Material | NICKEL ALLOY NUT |
| Material | RUBBER SYNTHETIC GASKET |
| Material | STEEL COMP 304 THREAD PIECE |
| Material | STEEL COMP 304 TAILPIECE |
| Reducer Type | CONCENTRIC |
| 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 |
|---|---|
| 2621-791-03ASSY 10 PRIMARY | Triumph Manufacturing Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 518-4682889 | D/9 Drawing number reference only U.S. Government activity |
| 518-4682889ITEMF21 | 3/2 Design control — primary reference U.S. Government activity |
| 2621-791-03ASSY10 | 3/2 Design control — primary reference U.S. Government activity |
| 518-4682889 ITE | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 2621-791-03 | D/9 Drawing number reference only U.S. Government activity |
| 87794-1161 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-138-6116 is a Union,tube, manufactured by Triumph Manufacturing Company, Inc., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-138-6116 has 1 manufacturer part number on file: 2621-791-03ASSY 10 (Triumph Manufacturing Company, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-152-9199. Verify interchangeability with system specifications before substitution.
Key specifications for 2621-791-03ASSY 10: Furnished Items and Quantity: 1 PREFORMED PACKING; Connection Style: SOCKET (TUBE) ALL ENDS; Coupling Flange Shape: HEXAGON; Tubing Wall Nominal Thickness for Which Designed: 0.123 INCHES ALL ENDS IN. 19 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.