The Nut,tube Coupling, cataloged under National Stock Number 4730-00-142-2579, 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 Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-142-2579 |
| Primary Part Number | 139898 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Length to Shoulder | 0.527 INCHES MINIMUM AND 0.537 INCHES MAXIMUM IN |
| Width Across Flats | 0.563 INCHES NOMINAL IN |
| Thread Series | UNF |
| Hole Configuration Style | CONFIGURATION B |
| Thread Pitch Diameters | +0.4050 TO 0.4076 INCHES IN |
| Material Document and Classification | AMS 5649 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Nut Height | 0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Drilled Hole Diameter | 0.047 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 316 OVERALL |
| Smallest Inside Diameter | 0.4040 INCHES MINIMUM AND 0.4076 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 0.250 INCHES IN |
| Hole Type and Quantity | 2 DRILLED |
| 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 |
|---|---|
| 139898 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 139898 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 139898 | 5/9 Secondary reference Production Services Corp the |
| 139898 | 5/9 Secondary reference Schering Laboratories Institutional Sales Dept K-11-3 L-5 |
NSN 4730-00-142-2579 is a Nut,tube Coupling, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-142-2579 has 1 manufacturer part number on file: 139898 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 139898: Length to Shoulder: 0.527 INCHES MINIMUM AND 0.537 INCHES MAXIMUM IN; Width Across Flats: 0.563 INCHES NOMINAL IN; Thread Series: UNF; Hole Configuration Style: CONFIGURATION B. 16 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.