The Packing Nut, cataloged under National Stock Number 4730-01-003-3957, 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 Atec Inc. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-003-3957 |
| Primary Part Number | 103-2044-1 |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Atec Inc |
| Status | ACTIVE |
| Length to Shoulder | 0.280 INCHES NOMINAL IN |
| Width Across Flats | 0.620 INCHES NOMINAL IN |
| Thread Length | 0.160 INCHES NOMINAL IN |
| Style Designator | HEXAGON, INTERNAL THREAD, SHOULDERED |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 5/16IN-24 IN |
| Screw Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Thread Class | 3B |
| Major Unthreaded Outside Diameter | 0.425 INCHES NOMINAL IN |
| Screw Thread Location | INTERNAL |
| Material | STEEL COMP 347 OR STEEL COMP 321 |
| Smallest Inside Diameter | 0.218 INCHES NOMINAL 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 |
|---|---|
| 103-2044-1 PRIMARY | Atec Inc (USA) |
NSN 4730-01-003-3957 is a Packing Nut, manufactured by Atec Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-003-3957 has 1 manufacturer part number on file: 103-2044-1 (Atec Inc).
Key specifications for 103-2044-1: Length to Shoulder: 0.280 INCHES NOMINAL IN; Width Across Flats: 0.620 INCHES NOMINAL IN; Thread Length: 0.160 INCHES NOMINAL IN; Style Designator: HEXAGON, INTERNAL THREAD, SHOULDERED. 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.