The Gear,worm, cataloged under National Stock Number 3020-00-640-4901, 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 Altra Industrial Motion Corp.. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-640-4901 |
| Primary Part Number | HQTH |
| Item Name | Gear,worm |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Altra Industrial Motion Corp. |
| Status | ACTIVE |
| Thread Form Direction | RIGHT-HAND |
| Bore Nominal Diameter | 0.218 INCHES BOTH ENDS IN |
| Helix Angle | 15.9497 DEGREES |
| Hub Nominal Diameter | 0.350 INCHES FIRST END IN |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.187 INCHES FIRST END IN |
| Face Type | STRAIGHT |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 0.4380 INCHES NOMINAL IN |
| Features Provided | CASEHARDENED |
| Hub Style Designator | PLAIN FIRST END |
| Thread Form Quantity | 4 |
| Nominal Outside Diameter | 0.500 INCHES IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.688 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 |
|---|---|
| HQTH | Altra Industrial Motion Corp. (USA) |
| Reference | Meaning |
|---|---|
| HQTH | 3/9 Design control — primary reference Profile Gear Corp |
NSN 3020-00-640-4901 is a Gear,worm, manufactured by Altra Industrial Motion Corp., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-640-4901 has 1 manufacturer part number on file: HQTH (Altra Industrial Motion Corp.).
Key specifications for HQTH: Thread Form Direction: RIGHT-HAND; Bore Nominal Diameter: 0.218 INCHES BOTH ENDS IN; Helix Angle: 15.9497 DEGREES; Hub Nominal Diameter: 0.350 INCHES FIRST END IN. 16 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.