The Sprocket Wheel, cataloged under National Stock Number 3020-01-261-9841, 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 Emerson Power Transmission Corporation Div Ept. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-261-9841 |
| Primary Part Number | FB312-1/2 |
| Item Name | Sprocket Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Emerson Power Transmission Corporation Div Ept |
| Status | ACTIVE |
| Hub Outside Diameter | 1.219 INCHES NOMINAL AA END IN |
| Securing Method | SETSCREW |
| Bore Length | 0.750 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Tooth Pitch | 0.375 INCHES NOMINAL IN |
| Outside Diameter | 1.625 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Style Designator | PLAIN |
| Bore Type | STRAIGHT |
| Teeth Row Quantity | 1 |
| Teeth Quantity Per Row | 12 |
| Protruding Hub Characteristic | PLAIN |
| Hardness Rating Test Method | NOT RATED |
| Distance From Center of Bore to Bottom of Keyway | 0.375 INCHES NOMINAL IN |
| Distance From Hub End to Flange End | 0.581 INCHES NOMINAL AA END IN |
| Keyway Width | 0.032 INCHES NOMINAL IN |
| Bore Diameter | 0.500 INCHES NOMINAL IN |
| Material | STEEL |
| Furnished Items | KEYING FACILITY |
| Face Width | 0.169 INCHES NOMINAL IN |
| Securing Location | AA END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 3020-01-261-9841 is a Sprocket Wheel, manufactured by Emerson Power Transmission Corporation Div Ept, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-261-9841 has 2 manufacturer part numbers on file: ST63D22-1 (Lockheed Martin Corp), FB312-1/2 (Emerson Power Transmission Corporation Div Ept).
Key specifications for FB312-1/2: Hub Outside Diameter: 1.219 INCHES NOMINAL AA END IN; Securing Method: SETSCREW; Bore Length: 0.750 INCHES NOMINAL IN; Design Form: PLAIN. 22 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.