The Gear,spur, cataloged under National Stock Number 3020-00-239-3871, 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 Fairbanks Morse, Llc. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-239-3871 |
| Primary Part Number | AFB4428A |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Fairbanks Morse, Llc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.500 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.438 INCHES FIRST END IN |
| Teeth Quantity | 26 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.438 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 1.6250 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 1.750 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.500 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 |
| Part Number | Manufacturer |
|---|---|
| AFB4428A PRIMARY | Fairbanks Morse, Llc (USA) |
| Reference | Meaning |
|---|---|
| AFB4428A | 3/9 Design control — primary reference U.S. Government activity |
NSN 3020-00-239-3871 is a Gear,spur, manufactured by Fairbanks Morse, Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-239-3871 has 1 manufacturer part number on file: AFB4428A (Fairbanks Morse, Llc).
Key specifications for AFB4428A: Bore Nominal Diameter: 0.500 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.438 INCHES FIRST END IN; Teeth Quantity: 26; Body Style: PLAIN, SOLID. 14 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.