The Adapter,straight,tube to Boss, cataloged under National Stock Number 4730-01-173-8346, 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 The Boeing Company Div Defense. Government technical data includes 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-173-8346 |
| Primary Part Number | 75A690639-2003 |
| Item Name | Adapter,straight,tube to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Connection Style | INVERTED FLARE (TUBE) FIRST END |
| Connection Style | GASKET SEAL (BOSS) SECOND END |
| Nominal Overall Length | 1.455 INCHES IN |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED INTERNAL BOSS SECOND END |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Nominal Thread Size | 0.750 INCHES SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Seat Angle | 30.0 DEGREES FIRST END |
| Thread Class | 3A FIRST END A |
| Thread Class | 3B SECOND END |
| Thread Quantity Per Inch | 20 FIRST END |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) SECOND END |
| Thread Series Designator | UNJS FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 75A690639-2003 | Bae Systems (operations) Limited (GBR) |
| 75A690639-2003 | Harlow Aerostructures, Llc (USA) |
| 75A690639-2003 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 75A690639-2003 | 5/9 Secondary reference British Aerospace (military Aircraft & Aerostructures) |
| 75A690639-2003 | 5/9 Secondary reference Bae Systems Plc |
| 75A690639-2003 | 5/9 Secondary reference British Aerospace Inc Military Support Div |
NSN 4730-01-173-8346 is a Adapter,straight,tube to Boss, manufactured by The Boeing Company Div Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-173-8346 has 3 manufacturer part numbers on file: 75A690639-2003 (Bae Systems (operations) Limited), 75A690639-2003 (Harlow Aerostructures, Llc), 75A690639-2003 (The Boeing Company Div Defense).
Key specifications for 75A690639-2003: Connection Style: INVERTED FLARE (TUBE) FIRST END; Connection Style: GASKET SEAL (BOSS) SECOND END; Nominal Overall Length: 1.455 INCHES IN; Connection Type: THREADED EXTERNAL TUBE FIRST END. 15 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.
NSN 4730-01-173-8346 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.