The Packing Nut, cataloged under National Stock Number 4730-00-274-3378, 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 Siemens Energy, Inc.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-274-3378 |
| Primary Part Number | HC112E |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Length to Shoulder | 0.500 INCHES NOMINAL IN |
| Width Across Flats | 1.625 INCHES NOMINAL IN |
| Thread Length | 0.375 INCHES NOMINAL IN |
| Style Designator | HEXAGON, INTERNAL THREAD, SHOULDERED |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 1.250-16 |
| Screw Thread Series Designator | UN |
| Thread Class | 3B |
| Screw Thread Location | INTERNAL |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 310 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 410 OR STEEL COMP 416 OR STEEL COMP 420 OR STEEL COMP 430 |
| Smallest Inside Diameter | 0.500 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 |
|---|---|
| HC112E PRIMARY | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| DD445S4501-171ALT5PC70 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-274-3378 is a Packing Nut, manufactured by Siemens Energy, Inc., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-274-3378 has 1 manufacturer part number on file: HC112E (Siemens Energy, Inc.).
Key specifications for HC112E: Length to Shoulder: 0.500 INCHES NOMINAL IN; Width Across Flats: 1.625 INCHES NOMINAL IN; Thread Length: 0.375 INCHES NOMINAL IN; Style Designator: HEXAGON, INTERNAL THREAD, SHOULDERED. 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.