The Sprocket Wheel, cataloged under National Stock Number 3020-01-042-0491, 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 Oshkosh Defense Llc. Government technical data includes 28 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-042-0491 |
| Primary Part Number | 1SR11 |
| Item Name | Sprocket Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Hub Outside Diameter | 1.500 INCHES NOMINAL AA END IN |
| Securing Method | THREADED HOLE(S) |
| Bore Length | 0.750 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Tooth Pitch | 0.375 INCHES NOMINAL IN |
| Asa Standard Chain Number | 35 |
| Outside Diameter | 1.990 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Style Designator | PLAIN |
| Pitch Diameter | 1.804 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Teeth Row Quantity | 1 |
| Teeth Quantity Per Row | 15 |
| Protruding Hub Characteristic | PLAIN |
| Hardness Rating Test Method | NOT RATED |
| Distance From Center of Bore to Bottom of Keyway | 0.625 INCHES NOMINAL IN |
| Distance From Hub End to Flange End | 0.594 INCHES NOMINAL AA END IN |
| Securing Hole Quantity | 1 |
| Thread Size | 0.250-20 |
| Keyway Width | 0.250 INCHES NOMINAL IN |
| Hole Location | CENTERED 0.219 IN.FROM END OF HUB,90 DEGS FROM KEYWAY IN |
| Bore Diameter | 1.000 INCHES NOMINAL IN |
| Material | STEEL |
| Furnished Items | KEYING FACILITY |
| Face Width | 0.168 INCHES NOMINAL IN |
| Furnished Items and Quantity | SETSCREW,ONE EACH |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 1SR11 PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 1SR11 | 5/9 Secondary reference Oshkosh Corp |
| RM1-120 | 5/9 Secondary reference Santa Rosa Mfg Co Inc |
| RMI-120 | C/1 Advisory reference — outside the item-of-supply concept Santa Rosa Mfg Co Inc |
NSN 3020-01-042-0491 is a Sprocket Wheel, manufactured by Oshkosh Defense Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-042-0491 has 1 manufacturer part number on file: 1SR11 (Oshkosh Defense Llc).
Key specifications for 1SR11: Hub Outside Diameter: 1.500 INCHES NOMINAL AA END IN; Securing Method: THREADED HOLE(S); Bore Length: 0.750 INCHES NOMINAL IN; Design Form: PLAIN. 28 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.