The Gear,spur, cataloged under National Stock Number 3020-00-421-7618, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 24 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-421-7618 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 7.750 INCHES BOTH ENDS IN |
| Teeth Quantity | 270 |
| Surface Treatment Document and Classification | MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 2 PLAIN TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.643 INCHES FIRST END IN |
| First Step Nominal Length | 0.532 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.125 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Hardness Rating | 42.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | QQ-S-763 CL 440C FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 8.4375 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 8.125 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| End Nominal Length | 0.111 INCHES FIRST END IN |
| Nominal Outside Diameter | 8.500 INCHES IN |
| Surface Treatment | PASSIVATE OVERALL |
| End Nominal Diameter | 7.937 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 440C OVERALL |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.515 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 |
|---|---|
| 211160-000 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-421-7618 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-421-7618: Bore Nominal Diameter: 7.750 INCHES BOTH ENDS IN; Teeth Quantity: 270; Surface Treatment Document and Classification: MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Body Style: PLAIN, SOLID. 24 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.