The Gear,helical, cataloged under National Stock Number 3020-00-072-0561, 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 Terra Dynamic Lc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-072-0561 |
| Primary Part Number | 729963 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Terra Dynamic Lc |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.983 INCHES BOTH ENDS IN |
| Helix Angle | 20.0000 DEGREES |
| Hub Nominal Diameter | 3.625 INCHES SECOND END IN |
| Hub Nominal Diameter | 3.625 INCHES FIRST END IN |
| Teeth Quantity | 40 |
| Body Style | WEBBED, OFFSET, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.838 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 57.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Material Document and Classification | AISI/SAE 8620 H ASSN STD SINGLE MATERIAL RESPONSE AND FED STD 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 7.0950 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 20 BOTH ENDS |
| Nominal Outside Diameter | 7.424 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Spline Pitch Diameter | 2.7880 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 1.7187 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 |
|---|---|
| 729963 PRIMARY | Terra Dynamic Lc (USA) |
| Reference | Meaning |
|---|---|
| 729963 | 5/9 Secondary reference American Standard Inc Westinghouse Air Brake Co Div |
| 729963 | 5/9 Secondary reference Komatsu America Corp. |
NSN 3020-00-072-0561 is a Gear,helical, manufactured by Terra Dynamic Lc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-072-0561 has 1 manufacturer part number on file: 729963 (Terra Dynamic Lc).
Key specifications for 729963: Bore Nominal Diameter: 2.983 INCHES BOTH ENDS IN; Helix Angle: 20.0000 DEGREES; Hub Nominal Diameter: 3.625 INCHES SECOND END IN; Hub Nominal Diameter: 3.625 INCHES FIRST END IN. 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.