The Ferrule,brazing,tube Fitting, cataloged under National Stock Number 4730-01-391-0729, 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 Swagelok Co. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-391-0729 |
| Primary Part Number | 403-1 |
| Item Name | Ferrule,brazing,tube Fitting |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Style Designator | INVERTED FLARE |
| Casehardening Indicator | NOT CASEHARDENED |
| Material | COPPER ALLOY |
| Hose/tube Outside Diameter for Which Designed | 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 |
NSN 4730-01-391-0729 is a Ferrule,brazing,tube Fitting, manufactured by Swagelok Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-391-0729 has 2 manufacturer part numbers on file: B-403-1 (Swagelok Co), 403-1 (Swagelok Co).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-578-8088. Verify interchangeability with system specifications before substitution.
Key specifications for 403-1: Style Designator: INVERTED FLARE; Casehardening Indicator: NOT CASEHARDENED; Material: COPPER ALLOY; Hose/tube Outside Diameter for Which Designed: 0.250 INCHES NOMINAL IN. 4 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.