The Packing Nut, cataloged under National Stock Number 4730-00-596-3947, 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 Babcock & Wilcox Co. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-596-3947 |
| Primary Part Number | 51449B |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Babcock & Wilcox Co |
| Status | ACTIVE |
| Length to Shoulder | 0.625 INCHES NOMINAL IN |
| Width Across Flats | 2.250 INCHES NOMINAL IN |
| Largest Inside Diameter | 1.812 INCHES NOMINAL IN |
| Thread Length | 0.406 INCHES NOMINAL IN |
| Style Designator | HEXAGON, EXTERNAL THREAD, RECESSED HEAD |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 2.125IN-16 IN |
| Screw Thread Series Designator | UN |
| Thread Class | 2A A |
| Screw Thread Location | EXTERNAL |
| Material | STEEL CORROSION RESISTING |
| Smallest Inside Diameter | 1.510 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 |
|---|---|
| 51449B | Babcock & Wilcox Co (USA) |
| Reference | Meaning |
|---|---|
| 117491EPC36 | 5/9 Secondary reference Babcock & Wilcox Co |
| 7800192 | 3/9 Design control — primary reference The Babcock & Wilcox Company Dba B & W Service Co Div B&w Service Company |
| 7800192 | C/1 Advisory reference — outside the item-of-supply concept Babcock & Wilcox Co |
NSN 4730-00-596-3947 is a Packing Nut, manufactured by Babcock & Wilcox Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-596-3947 has 1 manufacturer part number on file: 51449B (Babcock & Wilcox Co).
Key specifications for 51449B: Length to Shoulder: 0.625 INCHES NOMINAL IN; Width Across Flats: 2.250 INCHES NOMINAL IN; Largest Inside Diameter: 1.812 INCHES NOMINAL IN; Thread Length: 0.406 INCHES NOMINAL IN. 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.