The Gear Cluster, cataloged under National Stock Number 3020-00-511-1157, 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 Dba Northrop Grumman Systems Corp. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-511-1157 |
| Primary Part Number | 625605 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| Status | ACTIVE |
| Hub Nominal Diameter | 0.124 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.155 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Nominal Overall Length | 0.818 INCHES IN |
| Material Document and Classification | MIL-S-7720,COND A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | 2 STEPS BOTH ENDS |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Nominal Length | 0.175 INCHES FIRST END IN |
| Hub Nominal Length | 0.160 INCHES SECOND END IN |
| Hub Nominal Length | 0.320 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 0.2833 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 1.0667 INCHES FIRST GEAR IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 303S OVERALL |
| Construction | SOLID |
| 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 |
|---|---|
| 625605 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA) |
| 625607 | Guptill Gear Corp (USA) |
| Reference | Meaning |
|---|---|
| 62S605 | D/9 Drawing number reference only Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
NSN 3020-00-511-1157 is a Gear Cluster, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-511-1157 has 2 manufacturer part numbers on file: 625605 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp), 625607 (Guptill Gear Corp).
1 possible match (shared part number, not a government interchangeability claim): 5999-01-513-9082. Verify interchangeability with system specifications before substitution.
Key specifications for 625605: Hub Nominal Diameter: 0.124 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.155 INCHES BETWEEN FIRST AND SECOND GEAR IN; Design Type: SPUR SECOND GEAR; Design Type: SPUR FIRST GEAR. 16 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.