The Coupling,boss, cataloged under National Stock Number 4730-00-203-3137, 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 13 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-203-3137 |
| Primary Part Number | 53E300125-25 |
| Item Name | Coupling,boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE |
| Connection Style | GASKET SEAL (BOSS) ALL ENDS |
| Nominal Overall Length | 1.828 INCHES IN |
| Connection Type | THREADED INTERNAL BOSS ALL ENDS |
| Style Designator | RIGID, SHORT CENTER WRENCHING FACILITY |
| Nominal Thread Size | 1.062 INCHES ALL ENDS IN |
| Specification/standard Data | 81343-AS4875 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 80205-NAS424 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Surface Treatment | ANODIZE OVERALL |
| Thread Class | 3B ALL ENDS |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Material | ALUMINUM ALLOY OVERALL |
| Thread Series Designator | UN 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 |
|---|---|
| 53E300125-25 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| NAS424-12D | 3/2 Design control — primary reference U.S. Government activity |
| MIL-F-5509 | 5/9 Secondary reference U.S. Government activity |
| AS4875 | 3/1 Design control — primary reference Sae International Dba Sae International |
| AS4875 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-203-3137 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 4730-00-203-3137 has 1 manufacturer part number on file: 53E300125-25 (The Boeing Company Div Defense).
Key specifications for 53E300125-25: Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE; Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE; Connection Style: GASKET SEAL (BOSS) ALL ENDS; Nominal Overall Length: 1.828 INCHES IN. 13 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.