The Gear,antibacklash,spur, cataloged under National Stock Number 3020-01-012-3471, 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 Astronautics Corporation of America. Government technical data includes 16 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 | 3020-01-012-3471 |
| Primary Part Number | 119878 |
| Item Name | Gear,antibacklash,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Astronautics Corporation of America |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.090 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.250 INCHES FIRST END IN |
| Teeth Quantity | 40 |
| Surface Treatment Document and Classification | MIL-STD-171,FINISH NO. 5.4.1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.184 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | QQ-S-764,TYPE 303,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 0.4166 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 0.4375 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 303 OVERALL |
| Face Nominal Width | 0.096 INCHES IN |
| 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 |
|---|---|
| 119878 PRIMARY | Astronautics Corporation of America (USA) |
NSN 3020-01-012-3471 is a Gear,antibacklash,spur, manufactured by Astronautics Corporation of America, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-012-3471 has 1 manufacturer part number on file: 119878 (Astronautics Corporation of America).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-722-5812. Verify interchangeability with system specifications before substitution.
Key specifications for 119878: Bore Nominal Diameter: 0.090 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.250 INCHES FIRST END IN; Teeth Quantity: 40; Surface Treatment Document and Classification: MIL-STD-171,FINISH NO. 5.4.1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.