The Gear,spur, cataloged under National Stock Number 3020-00-042-8436, 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 19 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. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-042-8436 |
| Primary Part Number | 104638 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Astronautics Corporation of America |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.188 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.234 INCHES SECOND END IN |
| Hub Nominal Diameter | 0.430 INCHES FIRST END IN |
| Teeth Quantity | 155 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.137 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.030 INCHES SECOND END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-7720,COMP 303SE MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.2906 INCHES MINIMUM AND 1.2916 INCHES MAXIMUM IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN SECOND END |
| Hub Style Designator | PINNED FIRST END |
| Nominal Outside Diameter | 1.307 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 303SE OVERALL |
| Face Nominal Width | 0.040 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 |
|---|---|
| 104638 PRIMARY | Astronautics Corporation of America (USA) |
NSN 3020-00-042-8436 is a Gear,spur, manufactured by Astronautics Corporation of America, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-042-8436 has 1 manufacturer part number on file: 104638 (Astronautics Corporation of America).
5 possible matches (shared part number, not a government interchangeability claim): 5305-00-601-7809, 5995-01-179-5953, 5330-01-459-4540. Verify interchangeability with system specifications before substitution.
Key specifications for 104638: Bore Nominal Diameter: 0.188 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.234 INCHES SECOND END IN; Hub Nominal Diameter: 0.430 INCHES FIRST END IN; Teeth Quantity: 155. 19 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.