The Coupling,boss, cataloged under National Stock Number 4730-01-369-5201, 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 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-369-5201 |
| Primary Part Number | 87500139-001 |
| Item Name | Coupling,boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Connection Style | GASKET SEAL (BOSS) ALL ENDS |
| Nominal Overall Length | 3.500 INCHES IN |
| Connection Type | THREADED INTERNAL BOSS ALL ENDS |
| Style Designator | THREADED INTERNAL |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2B ALL ENDS |
| Material | STEEL COMP 304 OVERALL |
| Thread Series Designator | UNF ALL ENDS |
| 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 |
|---|---|
| 87500139-001 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 87500139 | D/9 Drawing number reference only U.S. Government activity |
| 87500139-001 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4730-01-369-5201 is a Coupling,boss, manufactured by The Boeing Company Div Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-369-5201 has 1 manufacturer part number on file: 87500139-001 (The Boeing Company Div Defense).
Key specifications for 87500139-001: Connection Style: GASKET SEAL (BOSS) ALL ENDS; Nominal Overall Length: 3.500 INCHES IN; Connection Type: THREADED INTERNAL BOSS ALL ENDS; Style Designator: THREADED INTERNAL. 9 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.