The Gear,helical, cataloged under National Stock Number 3020-00-009-4040, 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 Simmonds Precision Products 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. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-009-4040 |
| Primary Part Number | A3428 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Simmonds Precision Products Inc |
| Status | ACTIVE |
| Keyway Nominal Width | 0.064 INCHES FIRST END IN |
| Bore Nominal Diameter | 0.375 INCHES FIRST END IN |
| Helix Angle | 45.0000 DEGREES |
| Hub Nominal Diameter | 0.590 INCHES FIRST END IN |
| Teeth Quantity | 23 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | RIGHT |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | FLUSH HUB |
| Material Document and Classification | QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.2364 INCHES MINIMUM AND 1.2374 INCHES MAXIMUM IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PINNED FIRST END |
| Nominal Outside Diameter | 1.298 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.225 INCHES BOTH ENDS IN |
| Surface Treatment | PASSIVATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 416 OVERALL |
| Face Nominal Width | 0.410 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A3428 PRIMARY | Simmonds Precision Products Inc (USA) |
NSN 3020-00-009-4040 is a Gear,helical, manufactured by Simmonds Precision Products Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-009-4040 has 1 manufacturer part number on file: A3428 (Simmonds Precision Products Inc).
2 possible matches (shared part number, not a government interchangeability claim): 7320-01-274-7729, 3040-01-300-3023. Verify interchangeability with system specifications before substitution.
Key specifications for A3428: Keyway Nominal Width: 0.064 INCHES FIRST END IN; Bore Nominal Diameter: 0.375 INCHES FIRST END IN; Helix Angle: 45.0000 DEGREES; Hub Nominal Diameter: 0.590 INCHES FIRST END IN. 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.
NSN 3020-00-009-4040 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.