The Packing Nut, cataloged under National Stock Number 4730-00-004-2790, 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 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-004-2790 |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Width Across Flats | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Thread Length | 0.360 INCHES NOMINAL IN |
| Style Designator | HEXAGON, EXTERNAL THREAD, BOSS |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 1.312-12 |
| Screw Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) |
| Surface Treatment | PASSIVATE |
| Thread Class | 3A A |
| Screw Thread Location | EXTERNAL |
| Material | STEEL COMP 630 |
| Smallest Inside Diameter | 1.070 INCHES MINIMUM AND 1.090 INCHES MAXIMUM 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 |
|---|---|
| 3186965 | 3/9 Design control — primary reference Allied-Signal Inc Dba Allied-Signal Aerospace Co Electrodynamics Div |
NSN 4730-00-004-2790 is a Packing Nut, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 2530-01-204-1199. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-00-004-2790: Width Across Flats: 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN; Thread Length: 0.360 INCHES NOMINAL IN; Style Designator: HEXAGON, EXTERNAL THREAD, BOSS; Overall Length: 0.655 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN. 12 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.