The Gear Cluster, cataloged under National Stock Number 3020-01-035-8176, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 25 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. 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 | 3020-01-035-8176 |
| Primary Part Number | 1856091 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Bore Nominal Diameter | UNABLE TO DECODE0.250 INCHES BOTH ENDS0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | UNABLE TO DECODE0.437 INCHES BOTH ENDS0.437 INCHES BOTH ENDS IN |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE SECOND GEARMIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE SECOND GEAR |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE SECOND GEARUNABLE TO DECODE |
| Surface Treatment Document and Classification | UNABLE TO DECODEMIL-A-8625,TYPE 3,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE FIRST GEARMIL-A-8625,TYPE 3,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE FIRST GEAR |
| Design Type | UNABLE TO DECODESPUR SECOND GEARSPUR SECOND GEAR |
| Design Type | UNABLE TO DECODESPUR FIRST GEARSPUR FIRST GEAR |
| Bore Style | UNABLE TO DECODEPLAIN BOTH ENDSPLAIN BOTH ENDS |
| Nominal Overall Length | 0.562 INCHES0.562 INCHES IN |
| Material Document and Classification | UNABLE TO DECODEQQ-A-225/6,ALLOY 2024,T351 FED SPEC SINGLE MATERIAL RESPONSE SECOND GEARQQ-A-225/6,ALLOY 2024,T351 FED SPEC SINGLE MATERIAL RESPONSE SECOND GEAR |
| Material Document and Classification | UNABLE TO DECODEQQ-S-764,TYPE 303 COND A FED SPEC SINGLE MATERIAL RESPONSE FIRST GEARQQ-S-764,TYPE 303 COND A FED SPEC SINGLE MATERIAL RESPONSE FIRST GEAR |
| Nominal Thread Size | UNABLE TO DECODE0.112 INCHES BOTH ENDS0.112 INCHES BOTH ENDS IN |
| Hub Style Designator | UNABLE TO DECODEPINNED FIRST ENDPINNED FIRST END |
| Hub Nominal Length | UNABLE TO DECODE0.125 INCHES FIRST END0.125 INCHES FIRST END IN |
| Hub Nominal Length | UNABLE TO DECODE0.437 INCHES SECOND END0.437 INCHES SECOND END IN |
| Nominal Outside Diameter | UNABLE TO DECODE0.539 INCHES FOURTH GEAR0.539 INCHES FOURTH GEAR IN |
| Nominal Outside Diameter | UNABLE TO DECODE3.039 INCHES FIFTH GEAR3.039 INCHES FIFTH GEAR IN |
| Surface Treatment | UNABLE TO DECODEANODIZE FIRST GEARANODIZE FIRST GEAR |
| Surface Treatment | UNABLE TO DECODEANODIZE SECOND GEARANODIZE SECOND GEAR |
| Material | UNABLE TO DECODEALUMINUM ALLOY 2024 SECOND GEARALUMINUM ALLOY 2024 SECOND GEAR |
| Material | UNABLE TO DECODESTEEL COMP 303 FIRST GEARSTEEL COMP 303 FIRST GEAR |
| Thread Series Designator | UNABLE TO DECODE |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) BOTH ENDSUNIFIED NATIONAL COARSE (UNC) BOTH ENDS |
| Construction | ASSEMBLEDASSEMBLED |
| Attachment Method | MOUNTING HOLEMOUNTING HOLE |
| 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 |
|---|---|
| 1856091 PRIMARY | Northrop Grumman Systems Corporation (USA) |
NSN 3020-01-035-8176 is a Gear Cluster, manufactured by Northrop Grumman Systems Corporation, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-035-8176 has 1 manufacturer part number on file: 1856091 (Northrop Grumman Systems Corporation).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-514-6319. Verify interchangeability with system specifications before substitution.
Key specifications for 1856091: Bore Nominal Diameter: UNABLE TO DECODE0.250 INCHES BOTH ENDS0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: UNABLE TO DECODE0.437 INCHES BOTH ENDS0.437 INCHES BOTH ENDS IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE SECOND GEARMIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE SECOND GEAR; Surface Treatment Document and Classification: MIL-A-8625,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE SECOND GEARUNABLE TO DECODE. 25 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.