The Gear,spur, cataloged under National Stock Number 3020-00-371-3433, 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 Caterpillar Inc Div Caterpillar Defense. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-371-3433 |
| Primary Part Number | 4B0870 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Keyway Nominal Width | 0.127 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.749 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.875 INCHES FIRST END IN |
| Hub Nominal Diameter | 0.656 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.207 INCHES FIRST END IN |
| Teeth Quantity | 32 |
| Body Style | WEBBED, OFFSET, WITH LIGHTENING HOLES |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.345 INCHES SECOND END IN |
| Style Designator | CONE SHAPE BODY, PROTRUDING HUB, RECESSED HUB |
| Material Document and Classification | SAE 380 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.3333 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 5.581 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.441 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | ALUMINUM ALLOY OVERALL |
| Face Nominal Width | 0.548 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 |
|---|---|
| 4B0870 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 4B870 | 5/9 Secondary reference Caterpillar Inc Div Caterpillar Defense |
NSN 3020-00-371-3433 is a Gear,spur, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-371-3433 has 1 manufacturer part number on file: 4B0870 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 4B0870: Keyway Nominal Width: 0.127 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.749 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.875 INCHES FIRST END IN; Hub Nominal Diameter: 0.656 INCHES SECOND END IN. 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.