The Nut,tube Coupling, cataloged under National Stock Number 4730-00-800-3554, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 14 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-800-3554 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 0.532 INCHES NOMINAL IN |
| Width Across Flats | 0.563 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNF |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Seat Angle | 90.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Specification/standard Data | 96906-MS51531 GOVERNMENT STANDARD |
| Nut Height | 0.610 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 316 OVERALL |
| Fabrication Method | MACHINED |
| Smallest Inside Diameter | 0.305 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.250 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 |
| Reference | Meaning |
|---|---|
| 4BTX-SS | 5/1 Secondary reference Parker Hannifin (uk) Ltd |
| 4070110C | 5/1 Secondary reference Sae International Dba Sae International |
| 4070110C | 5/9 Secondary reference U.S. Government activity |
| 4BTXSS | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters |
| 4730PL0741224 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 8431417 | 5/1 Secondary reference U.S. Government activity |
| 4BTXSS | C/1 Advisory reference — outside the item-of-supply concept Parker-Hannifin Corporation Div Gas Turbine Fuel Systems |
| MS51531B4S | 2/2 Government specification standardization U.S. Government activity |
| 114-0548-003 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| MIL-DTL-18866 | 4/1 Identification reference U.S. Government activity |
| MS51531 | 5/9 Secondary reference U.S. Government activity |
| 4-BTX-SS | 5/9 Secondary reference U.S. Government activity |
| 6872685-61C | 5/1 Secondary reference Allison Transmission Inc Dba Allison Transmission, Inc |
| 4-BTX-SS | 5/1 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division |
NSN 4730-00-800-3554 is a Nut,tube Coupling, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-231-2675, 4730-01-398-8324, 5310-01-631-5093. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-800-3554: Length to Shoulder: 0.532 INCHES NOMINAL IN; Width Across Flats: 0.563 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNF. 18 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.