The Gear,helical, cataloged under National Stock Number 3020-00-065-0231, 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 Perkins Engines 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-065-0231 |
| Primary Part Number | 31171542 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Perkins Engines Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.5000 INCHES BOTH ENDS IN |
| Helix Angle | 22.0000 DEGREES |
| Teeth Quantity | 48 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 3 PLAIN AXIALLY THROUGH BODY FIRST END |
| Mounting Hole Nominal Diameter | 0.625 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | HUBLESS, RECESSED BODY |
| Pitch Diameter | 4.1875 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 4.3750 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Bolt Hole Circle Nominal Diameter | 2.500 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.094 INCHES FIRST END IN |
| Body Recess Nominal Depth | 0.344 INCHES SECOND END IN |
| Face Nominal Width | 0.750 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 |
|---|---|
| 31171542 PRIMARY | Perkins Engines Inc (USA) |
| Reference | Meaning |
|---|---|
| 31171542 | 5/9 Secondary reference Westerbeke Corporation |
NSN 3020-00-065-0231 is a Gear,helical, manufactured by Perkins Engines Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-065-0231 has 1 manufacturer part number on file: 31171542 (Perkins Engines Inc).
Key specifications for 31171542: Bore Nominal Diameter: 1.5000 INCHES BOTH ENDS IN; Helix Angle: 22.0000 DEGREES; Teeth Quantity: 48; 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.