The Gear,helical, cataloged under National Stock Number 3020-00-692-5686, 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 U S Army Tank Automotive Command Amsta-Im-Mm. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-692-5686 |
| Primary Part Number | 6245938 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.107 INCHES BOTH ENDS IN |
| Helix Angle | 25.8419 DEGREES |
| Hub Nominal Diameter | 2.688 INCHES SECOND END IN |
| Hub Nominal Diameter | 3.875 INCHES FIRST END IN |
| Teeth Quantity | 27 |
| Body Style | WEBBED, OFFSET, SOLID |
| Counterbore Nominal Diameter | 2.9375 INCHES FIRST END IN |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 15 PLAIN AXIALLY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.375 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.094 INCHES SECOND END IN |
| Mounting Hole Nominal Diameter | 0.359 INCHES AXIALLY THROUGH HUB FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 59.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM HUB |
| Nominal Overall Length | 2.344 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | FED ST6 66,AISI/SAE 8617H FED STD 1ST MATERIAL RESPONSE OR 8620 FED STD 2ND MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 5.330 INCHES IN |
| Pressure Angle | 17.5000 DEGREES |
| Material | STEEL COMP 8617H OR STEEL COMP 8620 OVERALL |
| Bolt Hole Circle Nominal Diameter | 3.250 INCHES AXIALLY THROUGH HUB FIRST END IN |
| Counterbore Nominal Depth | 0.594 INCHES FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 1.875 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 |
|---|---|
| 6245938 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| DU903 | 3/9 Design control — primary reference U.S. Government activity |
NSN 3020-00-692-5686 is a Gear,helical, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-692-5686 has 1 manufacturer part number on file: 6245938 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 6245938: Bore Nominal Diameter: 2.107 INCHES BOTH ENDS IN; Helix Angle: 25.8419 DEGREES; Hub Nominal Diameter: 2.688 INCHES SECOND END IN; Hub Nominal Diameter: 3.875 INCHES FIRST END IN. 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.