The Packing Nut, cataloged under National Stock Number 4730-00-330-4520, 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 14 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 16 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-330-4520 |
| Primary Part Number | 81417S41-230PC11 |
| 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 | 0.484 INCHES NOMINAL IN |
| Width Across Flats | 1.654 INCHES NOMINAL IN |
| Largest Inside Diameter | 0.886 INCHES MINIMUM AND 0.898 INCHES MAXIMUM IN |
| Thread Length | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Style Designator | HEXAGON, EXTERNAL THREAD, INTERNAL SHOUL DER |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 0.375IN-12 IN |
| Screw Thread Series Designator | UNF |
| Surface Treatment | CADMIUM |
| Thread Class | 2A A |
| Screw Thread Location | EXTERNAL |
| Material | STEEL |
| Smallest Inside Diameter | 0.250 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 |
|---|---|
| 81417S41-230PC11 | Naval Sea Systems Command (USA) |
| 72-77320-168 | Naval Sea Systems Command (USA) |
| 81417S41-228PC11 | Naval Sea Systems Command (USA) |
| NT7840 | Fairbanks Morse, Llc (USA) |
| 72-7732-168 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| NT7840 | 3/9 Design control — primary reference Haynes Corporation |
| 81417S41-572PC11 | 5/2 Secondary reference U.S. Government activity |
| 81417S41-573PC11 | 5/2 Secondary reference U.S. Government activity |
| GJN77-93 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| GJN77-92PC11 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| GJN77-84PC11 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| 81417S41-573 | D/9 Drawing number reference only U.S. Government activity |
| 72-7732-168 | 5/9 Secondary reference U.S. Government activity |
| NT7840 | 5/9 Secondary reference Coltec Industries Inc Dba Fairbanks Morse Engine Fm/alco |
| NT7840 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| 81417S41-230PC11 | 5/9 Secondary reference U.S. Government activity |
| GJN77-93PC11 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| NT7840 | C/1 Advisory reference — outside the item-of-supply concept N L Industries Inc |
| 81417S41-228PC11 | 5/9 Secondary reference U.S. Government activity |
| GJN77-82PC11 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| 72-77320-168 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-330-4520 is a Packing Nut, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-330-4520 has 5 manufacturer part numbers on file: 81417S41-230PC11 (Naval Sea Systems Command), 72-77320-168 (Naval Sea Systems Command), 81417S41-228PC11 (Naval Sea Systems Command), NT7840 (Fairbanks Morse, Llc), 72-7732-168 (Naval Sea Systems Command).
Key specifications for 81417S41-230PC11: Length to Shoulder: 0.484 INCHES NOMINAL IN; Width Across Flats: 1.654 INCHES NOMINAL IN; Largest Inside Diameter: 0.886 INCHES MINIMUM AND 0.898 INCHES MAXIMUM IN; Thread Length: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN. 14 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.