The Packing Nut, cataloged under National Stock Number 4730-01-063-3694, 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 Myers F E Co Sub of Pentair Corp. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-063-3694 |
| Primary Part Number | 20488A |
| Item Name | Packing Nut |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Myers F E Co Sub of Pentair Corp |
| Status | ACTIVE |
| Width Across Flats | 0.750 INCHES NOMINAL IN |
| Seat Angle in Deg | 45.0 |
| Thread Length | 0.312 INCHES NOMINAL IN |
| Style Designator | HEXAGON, EXTERNAL THREAD, INVERTED FLARE |
| Thread Direction | RIGHT-HAND |
| Casehardening Indicator | NOT CASEHARDENED |
| Thread Size | 0.375-16 |
| Screw Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Thread Class | 2A A |
| Screw Thread Location | EXTERNAL |
| Material | STEEL COMP 303 |
| Smallest Inside Diameter | 0.078 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 |
|---|---|
| A3-PS-000121/2 | Calder Ltd (GBR) |
| 20488A | Calder Ltd (GBR) |
| 20488A PRIMARY | Myers F E Co Sub of Pentair Corp (USA) |
| Reference | Meaning |
|---|---|
| A3-PS-000121 | 5/1 Secondary reference Calder Ltd |
NSN 4730-01-063-3694 is a Packing Nut, manufactured by Myers F E Co Sub of Pentair Corp, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-063-3694 has 3 manufacturer part numbers on file: A3-PS-000121/2 (Calder Ltd), 20488A (Calder Ltd), 20488A (Myers F E Co Sub of Pentair Corp).
3 possible matches (shared part number, not a government interchangeability claim): 5310-01-063-4970, 5310-01-279-2558, 5330-01-279-2631. Verify interchangeability with system specifications before substitution.
Key specifications for 20488A: Width Across Flats: 0.750 INCHES NOMINAL IN; Seat Angle in Deg: 45.0; Thread Length: 0.312 INCHES NOMINAL IN; Style Designator: HEXAGON, EXTERNAL THREAD, INVERTED FLARE. 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.