The Gear,spur, cataloged under National Stock Number 3020-01-057-7871, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-057-7871 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.375 INCHES FIRST END IN |
| Teeth Quantity | 59 |
| Surface Treatment Document and Classification | MIL-P-16232,TYPE M,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.060 INCHES FIRST END IN |
| Hardness Rating | 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | 66AISI/SAE4620 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 1.260 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.163 INCHES BOTH ENDS IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4620 OVERALL |
| Face Nominal Width | 0.188 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 |
| Reference | Meaning |
|---|---|
| 79323 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-057-7871 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 2010-01-273-5520. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-01-057-7871: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.375 INCHES FIRST END IN; Teeth Quantity: 59; Surface Treatment Document and Classification: MIL-P-16232,TYPE M,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.