The Gear,spur, cataloged under National Stock Number 3020-00-474-4025, 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 Dorer Engineering Inc Dba O J Rodgers Company. Government technical data includes 23 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-474-4025 |
| Primary Part Number | R1056-56 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Dorer Engineering Inc Dba O J Rodgers Company |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES COUNTER BORE SECOND END IN |
| Teeth Quantity | 72 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 0.875 INCHES COUNTER BORE SECOND END IN |
| Bore Style | W/COUNTERBORE COUNTER BORE SECOND END |
| Mounting Hole Type and Quantity | 1 THREADED TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.412 INCHES FIRST END IN |
| First Step Nominal Length | 0.188 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | QQ-B-626,1/2H FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.5000 INCHES NOMINAL IN |
| First Step Nominal Diameter | 1.125 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Mounting Hole Nominal Thread Size | 0.164 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| End Nominal Length | 0.234 INCHES FIRST END IN |
| Nominal Outside Diameter | 1.542 INCHES IN |
| End Nominal Diameter | 0.500 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | COPPER ALLOY 230 OVERALL |
| Counterbore Nominal Depth | 0.234 INCHES COUNTER BORE SECOND END IN |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) TRANSVERSELY THROUGH HUB FIRST END |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.141 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 |
|---|---|
| R1056-56 PRIMARY | Dorer Engineering Inc Dba O J Rodgers Company (USA) |
NSN 3020-00-474-4025 is a Gear,spur, manufactured by Dorer Engineering Inc Dba O J Rodgers Company, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-474-4025 has 1 manufacturer part number on file: R1056-56 (Dorer Engineering Inc Dba O J Rodgers Company).
Key specifications for R1056-56: Bore Nominal Diameter: 0.250 INCHES COUNTER BORE SECOND END IN; Teeth Quantity: 72; Body Style: PLAIN, SOLID; Counterbore Nominal Diameter: 0.875 INCHES COUNTER BORE SECOND END IN. 23 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.