The Gear,helical, cataloged under National Stock Number 3020-00-953-9909, 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 22 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-953-9909 |
| Primary Part Number | 7748587 |
| 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 | 4.505 INCHES BOTH ENDS IN |
| Helix Angle | 17.5447 DEGREES |
| Hub Nominal Diameter | 4.656 INCHES BETWEEN BODY AND FLANGE IN |
| Teeth Quantity | 26 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Flange Nominal Thickness | 0.900 INCHES IN |
| Flange Nominal Diameter | 5.326 INCHES IN |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 57.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | FLANGED END |
| Material Document and Classification | MIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.2825 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Distance Between Outer Body Face and Inner Flange Face | 2.719 INCHES IN |
| Spline Quantity | 34 BOTH ENDS |
| Nominal Outside Diameter | 5.678 INCHES IN |
| Pressure Angle | 17.5000 DEGREES |
| Material | STEEL COMP 8620 OVERALL |
| Spline Pitch Diameter | 4.2500 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 2.375 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 |
|---|---|
| 7748587 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 2520009539909 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
NSN 3020-00-953-9909 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 3020-00-953-9909 has 1 manufacturer part number on file: 7748587 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7748587: Bore Nominal Diameter: 4.505 INCHES BOTH ENDS IN; Helix Angle: 17.5447 DEGREES; Hub Nominal Diameter: 4.656 INCHES BETWEEN BODY AND FLANGE IN; Teeth Quantity: 26. 22 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.