The Gear,helical, cataloged under National Stock Number 3020-00-446-9989, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-446-9989 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.625 INCHES BOTH ENDS IN |
| Helix Angle | 23.9000 DEGREES |
| Teeth Quantity | 64 |
| Body Style | WEBBED, OFFSET, WITH LIGHTENING HOLES |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 3 THREADED AXIALLY THROUGH BODY FIRST END |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 293.0 BRINELL STANDARD MINIMUM AND 331.0 BRINELL STANDARD MAXIMUM OVERALL |
| Style Designator | HUBLESS, RECESSED BODY |
| Pitch Diameter | 7.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Mounting Hole Nominal Thread Size | 0.500 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Nominal Outside Diameter | 7.200 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH BODY FIRST END |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 1.125 INCHES FIRST END IN |
| Face Nominal Width | 1.750 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 |
| Reference | Meaning |
|---|---|
| 2R602PC27 | 5/9 Secondary reference Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots |
| 838-739-041 | C/1 Advisory reference — outside the item-of-supply concept Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots |
| 838-739-041 AND 838-740-041 | 3/9 Design control — primary reference Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand |
| 838-740-041 | C/1 Advisory reference — outside the item-of-supply concept Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots |
| 838-739-041AND838-740-041 | 5/9 Secondary reference Dresser, Inc. Dba Dresser Roots Blowers & Compressors Div Dresser Roots |
NSN 3020-00-446-9989 is a Gear,helical, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-446-9989: Bore Nominal Diameter: 3.625 INCHES BOTH ENDS IN; Helix Angle: 23.9000 DEGREES; Teeth Quantity: 64; Body Style: WEBBED, OFFSET, WITH LIGHTENING HOLES. 19 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.