The Packing Nut, cataloged under National Stock Number 4730-01-313-4301, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-313-4301 |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Length to Shoulder | 1.000 INCHES NOMINAL IN |
| Hole or Slot Quantity | 4 |
| Thread Length | 0.750 INCHES NOMINAL IN |
| Style Designator | ROUND, INTERNAL THREAD, SHOULDERED |
| Thread Direction | RIGHT-HAND |
| Thread Size | 3 3/8-12 |
| Major Unthreaded Outside Diameter | 3.750 INCHES NOMINAL IN |
| Material | NICKEL ALLOY |
| Smallest Inside Diameter | 2.250 INCHES NOMINAL IN |
| Hole Diameter | 0.250 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY FREE FROM MERCURY CONTAMINATION |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 926B885 | 3/1 Design control — primary reference Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd |
| 926B885 | 5/9 Secondary reference Cbs Broadcasting Inc. Dba Cbs Div Bechtel Plant Machinery Inc. - Pittsburgh |
NSN 4730-01-313-4301 is a Packing Nut, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4730-01-528-8082. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-313-4301: Length to Shoulder: 1.000 INCHES NOMINAL IN; Hole or Slot Quantity: 4; Thread Length: 0.750 INCHES NOMINAL IN; Style Designator: ROUND, INTERNAL THREAD, SHOULDERED. 11 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.