The Gear,worm Wheel, cataloged under National Stock Number 3020-00-448-3973, 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 20 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-448-3973 |
| Primary Part Number | 78509 |
| Item Name | Gear,worm Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Telemechanics Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.500 INCHES BOTH ENDS IN |
| Helix Angle | 21.8000 DEGREES |
| Teeth Quantity | 30 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 3 COUNTERBORED AXIALLY THROUGH BODY FIRST END |
| Throat Nominal Radius | 0.625 INCHES IN |
| Face Type | CONCAVE |
| Mounting Hole Nominal Diameter | 0.348 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Style Designator | HUBLESS, RECESSED BODY |
| Pitch Diameter | 1.6820 INCHES NOMINAL IN |
| Nominal Outside Diameter | 1.875 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | PLASTIC PHENOL FORMALDEHYDE (PMO) OVERALL |
| Bolt Hole Circle Nominal Diameter | 0.875 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Mating Thread Lead Quantity | 4 |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.250 INCHES FIRST END IN |
| Face Nominal Width | 0.500 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 |
|---|---|
| 78509 PRIMARY | Telemechanics Inc (USA) |
NSN 3020-00-448-3973 is a Gear,worm Wheel, manufactured by Telemechanics Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-448-3973 has 1 manufacturer part number on file: 78509 (Telemechanics Inc).
1 possible match (shared part number, not a government interchangeability claim): 3030-01-259-8861. Verify interchangeability with system specifications before substitution.
Key specifications for 78509: Bore Nominal Diameter: 0.500 INCHES BOTH ENDS IN; Helix Angle: 21.8000 DEGREES; Teeth Quantity: 30; Body Style: WEBBED, OFFSET, SOLID. 20 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.