The Nut,tube Coupling, cataloged under National Stock Number 4730-00-533-1898, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-00-533-1898 |
| Primary Part Number | 5331898 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Length to Shoulder | 0.281 INCHES NOMINAL IN |
| Width Across Flats | 0.437 INCHES NOMINAL IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Nut Height | 0.406 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 24 |
| Material | COPPER ALLOY OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.130 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.125 INCHES IN |
| 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 |
|---|---|
| 5331898 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 43539-2 | 5/9 Secondary reference Imperial |
NSN 4730-00-533-1898 is a Nut,tube Coupling, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-533-1898 has 1 manufacturer part number on file: 5331898 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 5331898: Length to Shoulder: 0.281 INCHES NOMINAL IN; Width Across Flats: 0.437 INCHES NOMINAL IN; Thread Series: UNF; Thread Direction: RIGHT-HAND. 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.