The Gear Cluster, cataloged under National Stock Number 3020-01-055-5985, 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 Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc. Government technical data includes 17 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-055-5985 |
| Primary Part Number | 1884927 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc |
| Status | ACTIVE |
| Hub Nominal Diameter | 0.472 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.485 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Precision Classification | QUALITY NUMBER 10 ALL GEARS |
| Hardness Rating | 320.0 BRINELL HULTGREN MINIMUM AND 360.0 BRINELL HULTGREN MAXIMUM OVERALL |
| Nominal Overall Length | 2.367 INCHES IN |
| Material Document and Classification | MIL-S-5000,COMP 4340 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 | 0.498 INCHES SECOND END IN |
| Hub Nominal Length | 0.531 INCHES FIRST END IN |
| Hub Nominal Length | 0.096 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 1.810 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 3.549 INCHES FIRST GEAR IN |
| Material | STEEL COMP 4340 OVERALL |
| Construction | ASSEMBLED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 3020-01-055-5985 is a Gear Cluster, manufactured by Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-055-5985 has 2 manufacturer part numbers on file: 1884927 (Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc), 1884927 (Northrop Grumman Systems Corporation).
Key specifications for 1884927: Hub Nominal Diameter: 0.472 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.485 INCHES BETWEEN FIRST AND SECOND GEAR IN; Design Type: SPUR SECOND GEAR; Design Type: SPUR FIRST GEAR. 17 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.