The Packing Nut, cataloged under National Stock Number 4730-01-490-2355, 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 Naval Sea Systems Command. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-490-2355 |
| Primary Part Number | 124-4322605 PC42 |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Length to Shoulder | 0.875 INCHES NOMINAL IN |
| Width Across Flats | 1.875 INCHES NOMINAL IN |
| Material Hardness Rating | 75.0 ROCKWELL C NOMINAL |
| Thread Length | 0.781 INCHES NOMINAL IN |
| Style Designator | HEXAGON, INTERNAL THREAD, SHOULDERED |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 1 5/8-12 |
| Screw Thread Series Designator | UN |
| Screw Thread Location | INTERNAL |
| Material | COPPER ALLOY |
| Smallest Inside Diameter | 1.156 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 |
|---|---|
| 124-4322605 PC42 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 124-4322605 | D/9 Drawing number reference only Naval Sea Systems Command |
| 124-4322605 PC | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 4730-01-490-2355 is a Packing Nut, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-490-2355 has 1 manufacturer part number on file: 124-4322605 PC42 (Naval Sea Systems Command).
3 possible matches (shared part number, not a government interchangeability claim): 5365-01-490-5081, 3120-01-490-5083, 5365-01-490-7295. Verify interchangeability with system specifications before substitution.
Key specifications for 124-4322605 PC42: Length to Shoulder: 0.875 INCHES NOMINAL IN; Width Across Flats: 1.875 INCHES NOMINAL IN; Material Hardness Rating: 75.0 ROCKWELL C NOMINAL; Thread Length: 0.781 INCHES NOMINAL 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.