The Gear,spur, cataloged under National Stock Number 3020-00-185-6852, 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 Overton Chicago Gear Corporation. Government technical data includes 27 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-185-6852 |
| Primary Part Number | 2587644 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Overton Chicago Gear Corporation |
| Status | ACTIVE |
| Bore Nominal Diameter | 4.134 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 10.000 INCHES SECOND END IN |
| Hub Nominal Diameter | 4.560 INCHES FIRST END IN |
| Teeth Quantity | 57 |
| Body Style | WEBBED, OFFSET, SOLID |
| Counterbore Nominal Diameter | 4.329 INCHES FIRST END IN |
| Counterbore Nominal Diameter | 4.440 INCHES SECOND END IN |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Mounting Hole Type and Quantity | 4 PLAIN AND 12 THREADED AXIALLY THROUGH BODY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.310 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.685 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.870 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM TEETH |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 11.4000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Mounting Hole Nominal Thread Size | 0.500 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Nominal Outside Diameter | 11.765 INCHES IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL COMP 3130H OR STEEL COMP 4320H OR STEEL COMP 4621H OVERALL |
| Counterbore Nominal Depth | 0.750 INCHES FIRST END IN |
| Counterbore Nominal Depth | 1.183 INCHES SECOND END IN |
| Mounting Hole Thread Series Designator | UNF AXIALLY THROUGH BODY FIRST END |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 1.500 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 |
NSN 3020-00-185-6852 is a Gear,spur, manufactured by Overton Chicago Gear Corporation, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-185-6852 has 2 manufacturer part numbers on file: 2587644 (Overton Chicago Gear Corporation), 2587644 (Amz Alabama Inc.).
Key specifications for 2587644: Bore Nominal Diameter: 4.134 INCHES BOTH ENDS IN; Hub Nominal Diameter: 10.000 INCHES SECOND END IN; Hub Nominal Diameter: 4.560 INCHES FIRST END IN; Teeth Quantity: 57. 27 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.