The Gear,helical, cataloged under National Stock Number 3020-00-678-2997, 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 24 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 | 3020-00-678-2997 |
| Primary Part Number | 8754390 |
| 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 | 1.332 INCHES BOTH ENDS IN |
| Helix Angle | 25.6000 DEGREES |
| Hub Nominal Diameter | 1.660 INCHES FIRST END IN |
| Teeth Quantity | 20 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.050 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.191 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM BODY |
| Hardness Rating | 60.0 ROCKWELL C NOMINAL HUB |
| Nominal Overall Length | 1.491 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 66 SAE 8620H FED STD ALL MATERIAL RESPONSES OVERALL |
| Pitch Diameter | 2.8164 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 15 BOTH ENDS |
| Nominal Outside Diameter | 3.097 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8620 OR STEEL COMP 8622 OVERALL |
| Spline Pitch Diameter | 1.2500 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 1.250 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 |
|---|---|
| 8754390 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 3020-00-678-2997 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 3020-00-678-2997 has 1 manufacturer part number on file: 8754390 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8754390: Bore Nominal Diameter: 1.332 INCHES BOTH ENDS IN; Helix Angle: 25.6000 DEGREES; Hub Nominal Diameter: 1.660 INCHES FIRST END IN; Teeth Quantity: 20. 24 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.