The Gear,internal, cataloged under National Stock Number 3020-01-181-3397, 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 13 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 | 3020-01-181-3397 |
| Primary Part Number | 12321029 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Teeth Quantity | 80 |
| Body Style | PLAIN, SOLID |
| Flange Nominal Thickness | 0.240 INCHES IN |
| Flange Nominal Diameter | 4.920 INCHES IN |
| Teeth Type | SPUR |
| Nominal Overall Length | 1.560 INCHES IN |
| Style Designator | RECESSED RING FLANGE TYPE HUG |
| Pitch Diameter | 4.0000 INCHES NOMINAL IN |
| Nominal Outside Diameter | 4.751 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4340 OVERALL |
| Body Recess Nominal Diameter | 4.016 INCHES BETWEEN BODY AND FLANGE IN |
| Body Recess Nominal Depth | 0.680 INCHES BETWEEN BODY AND FLANGE 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 |
|---|---|
| 12321029 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 3020-01-181-3397 is a Gear,internal, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-181-3397 has 1 manufacturer part number on file: 12321029 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12321029: Teeth Quantity: 80; Body Style: PLAIN, SOLID; Flange Nominal Thickness: 0.240 INCHES IN; Flange Nominal Diameter: 4.920 INCHES IN. 13 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.