The Gear,helical, cataloged under National Stock Number 3020-00-684-1649, 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 Rexnord Industries Llc. Government technical data includes 22 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 | 3020-00-684-1649 |
| Primary Part Number | 319398 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Rexnord Industries Llc |
| Status | ACTIVE |
| Keyway Nominal Width | 0.501 INCHES BOTH ENDS IN |
| Helix Angle | 30.0483 DEGREES |
| Hub Nominal Diameter | 2.750 INCHES FIRST END IN |
| Teeth Quantity | 89 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | LEFT |
| Bore Style | TAPERED W/KEYWAY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.500 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Taper Major Nominal Diameter | 2.244 INCHES FIRST END IN |
| Material Document and Classification | MIL-S-890,ALLOY NO. 4 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 11.2130 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 11.430 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.403 INCHES BOTH ENDS IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Body Recess Nominal Depth | 0.875 INCHES SECOND END IN |
| Face Nominal Width | 2.750 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 |
|---|---|
| 319398 PRIMARY | Rexnord Industries Llc (USA) |
NSN 3020-00-684-1649 is a Gear,helical, manufactured by Rexnord Industries Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-684-1649 has 1 manufacturer part number on file: 319398 (Rexnord Industries Llc).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-286-0275. Verify interchangeability with system specifications before substitution.
Key specifications for 319398: Keyway Nominal Width: 0.501 INCHES BOTH ENDS IN; Helix Angle: 30.0483 DEGREES; Hub Nominal Diameter: 2.750 INCHES FIRST END IN; Teeth Quantity: 89. 22 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.