The Gear,helical, cataloged under National Stock Number 3020-01-010-9243, 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 Telemechanics Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-010-9243 |
| Primary Part Number | 320439 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Telemechanics Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.3750 INCHES BOTH ENDS IN |
| Helix Angle | 15.0000 DEGREES |
| Teeth Quantity | 115 |
| Body Style | SPOKED |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 3 PLAIN AXIALLY THROUGH HUB FIRST END |
| Mounting Hole Nominal Diameter | 0.150 INCHES AXIALLY THROUGH HUB FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | HUBLESS, RECESSED BODY |
| Pitch Diameter | 3.5937 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 3.6250 INCHES IN |
| Surface Treatment | CADMIUM HUB |
| Pressure Angle | 20.0000 DEGREES |
| Material | PLASTIC BODY |
| Material | STEEL HUB |
| Bolt Hole Circle Nominal Diameter | 1.000 INCHES AXIALLY THROUGH HUB FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.062 INCHES SECOND END IN |
| Face Nominal Width | 0.250 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 |
|---|---|
| 320439 PRIMARY | Telemechanics Inc (USA) |
| Reference | Meaning |
|---|---|
| 320439 | 5/9 Secondary reference American Telephone and Telegraph Co |
NSN 3020-01-010-9243 is a Gear,helical, manufactured by Telemechanics Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-010-9243 has 1 manufacturer part number on file: 320439 (Telemechanics Inc).
Key specifications for 320439: Bore Nominal Diameter: 0.3750 INCHES BOTH ENDS IN; Helix Angle: 15.0000 DEGREES; Teeth Quantity: 115; Body Style: SPOKED. 21 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.