The Sprocket Wheel, cataloged under National Stock Number 3020-01-435-0074, 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 Electric Co Browning Mfg Div. Government technical data includes 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-435-0074 |
| Primary Part Number | 50B20-1.375IN.BORE |
| Item Name | Sprocket Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Emerson Electric Co Browning Mfg Div |
| Status | ACTIVE |
| Hub Outside Diameter | 3.000 INCHES NOMINAL AA END IN |
| Bore Length | 1.000 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Tooth Pitch | 0.625 INCHES NOMINAL IN |
| Outside Diameter | 4.320 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Style Designator | PLAIN |
| Pitch Diameter | 3.995 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Teeth Row Quantity | 1 |
| Teeth Quantity Per Row | 20 |
| Protruding Hub Characteristic | PLAIN |
| Hardness Rating Test Method | NOT RATED |
| Distance From Center of Bore to Bottom of Keyway | 0.844 INCHES NOMINAL IN |
| Distance From Hub End to Flange End | 0.657 INCHES NOMINAL AA END IN |
| Keyway Width | 0.312 INCHES NOMINAL IN |
| Bore Diameter | 1.375 INCHES NOMINAL IN |
| Material | STEEL |
| Furnished Items | KEYING FACILITY |
| Face Width | 0.343 INCHES NOMINAL 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 |
|---|---|
| 50B20-1.375IN.BORE PRIMARY | Emerson Electric Co Browning Mfg Div (USA) |
| 50B20 PRIMARY | Figgie Intl Inc Logan Co Div (USA) |
| Reference | Meaning |
|---|---|
| 15241000 | D/9 Drawing number reference only U.S. Government activity |
| 15241000 ITEM 82 | 5/9 Secondary reference U.S. Government activity |
NSN 3020-01-435-0074 is a Sprocket Wheel, manufactured by Emerson Electric Co Browning Mfg Div, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-435-0074 has 2 manufacturer part numbers on file: 50B20-1.375IN.BORE (Emerson Electric Co Browning Mfg Div), 50B20 (Figgie Intl Inc Logan Co Div).
3 possible matches (shared part number, not a government interchangeability claim): 3020-01-435-0118, 3950-01-435-4935, 3950-01-435-4982. Verify interchangeability with system specifications before substitution.
Key specifications for 50B20-1.375IN.BORE: Hub Outside Diameter: 3.000 INCHES NOMINAL AA END IN; Bore Length: 1.000 INCHES NOMINAL IN; Design Form: PLAIN; Tooth Pitch: 0.625 INCHES NOMINAL IN. 21 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.