The Gear,spur, cataloged under National Stock Number 3020-00-239-3859, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-239-3859 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Keyway Nominal Width | 0.875 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 3.4980 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 5.000 INCHES FIRST END IN |
| Teeth Quantity | 30 |
| Body Style | PLAIN, SOLID |
| Bore Style | W/ 2 KEYWAYS BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.125 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 7.5000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 7.9000 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 2.2170 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Face Nominal Width | 2.500 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 |
|---|---|
| B4279 | C/1 Advisory reference — outside the item-of-supply concept Control Flow, Inc. Dba Westech Heavy Machinery Division Div Westech Heavy Machinery Division |
| B4279 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-239-3859 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-239-3859: Keyway Nominal Width: 0.875 INCHES BOTH ENDS IN; Bore Nominal Diameter: 3.4980 INCHES BOTH ENDS IN; Hub Nominal Diameter: 5.000 INCHES FIRST END IN; Teeth Quantity: 30. 18 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.