The Gear,spur, cataloged under National Stock Number 3020-00-977-3750, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 30 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-977-3750 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Teeth Quantity | 60 |
| Second Step Nominal Diameter | 0.173 INCHES SECOND END IN |
| Second Step Nominal Diameter | 0.187 INCHES FIRST END IN |
| Surface Treatment Document and Classification | MIL-F-14072 FINISH E303 MIL SPEC SINGLE TREATMENT RESPONSE HUB |
| Body Style | PLAIN, SOLID |
| Nominal Distance Between Body Face and Protruding Hub End | 0.153 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.055 INCHES SECOND END IN |
| First Step Nominal Length | 0.010 INCHES SECOND END IN |
| First Step Nominal Length | 0.125 INCHES FIRST END IN |
| Second Step Nominal Length | 0.153 INCHES FIRST END IN |
| Second Step Nominal Length | 0.015 INCHES SECOND END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | QQ-S-763,COND A FED SPEC SINGLE MATERIAL RESPONSE HUB |
| Material Document and Classification | QQ-A-355,COND T3 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Pitch Diameter | 0.5000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 0.010 INCHES FIRST END IN |
| First Step Nominal Diameter | 0.125 INCHES SECOND END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | 2 STEPS SECOND END |
| End Nominal Length | 0.030 INCHES FIRST END IN |
| End Nominal Length | 0.030 INCHES SECOND END IN |
| Nominal Outside Diameter | 0.516 INCHES IN |
| Surface Treatment | PASSIVATE HUB |
| Surface Treatment | ANODIZE BODY |
| End Nominal Diameter | 0.055 INCHES FIRST END IN |
| End Nominal Diameter | 0.055 INCHES SECOND END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | ALUMINUM BODY |
| Material | STEEL COMP 303 HUB |
| 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 |
|---|---|
| 436860-1 | 5/2 Secondary reference U.S. Government activity |
| 436860 | 5/9 Secondary reference U.S. Government activity |
| 438049-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-977-3750 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): 5995-01-198-9068. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-00-977-3750: Teeth Quantity: 60; Second Step Nominal Diameter: 0.173 INCHES SECOND END IN; Second Step Nominal Diameter: 0.187 INCHES FIRST END IN; Surface Treatment Document and Classification: MIL-F-14072 FINISH E303 MIL SPEC SINGLE TREATMENT RESPONSE HUB. 30 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.