The Gear,helical, cataloged under National Stock Number 3020-01-239-6578, 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 Aimtron Systems, Llc. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-239-6578 |
| Primary Part Number | 508238 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Aimtron Systems, Llc |
| Status | ACTIVE |
| Bore Nominal Diameter | 12.501 INCHES BOTH ENDS IN |
| Helix Angle | 20.0000 DEGREES |
| Teeth Quantity | 111 |
| Tooth Direction | RIGHT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 1 PLAIN AND 8 COUNTERBORED TRANSVERSELY THROUGH FACE |
| Precision Classification | QUALITY NUMBER 8 |
| Mounting Hole Nominal Diameter | 0.351 INCHES TRANSVERSELY THROUGH FACE IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Pitch Diameter | 19.6872 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Features Provided | ALIGNMENT HOLE |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 508238 PRIMARY | Aimtron Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 508238 | 5/9 Secondary reference Cardion Inc |
NSN 3020-01-239-6578 is a Gear,helical, manufactured by Aimtron Systems, Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-239-6578 has 1 manufacturer part number on file: 508238 (Aimtron Systems, Llc).
Key specifications for 508238: Bore Nominal Diameter: 12.501 INCHES BOTH ENDS IN; Helix Angle: 20.0000 DEGREES; Teeth Quantity: 111; Tooth Direction: RIGHT. 17 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.