The Gear,spur, cataloged under National Stock Number 3020-00-294-8573, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-294-8573 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Keyway Nominal Width | 0.500 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 3.125 INCHES FIRST END IN |
| Hub Nominal Diameter | 3.625 INCHES SECOND END IN |
| Teeth Quantity | 55 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Bore Style | TAPERED W/KEYWAY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.938 INCHES FIRST END IN |
| Hardness Rating | 59.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 3.500 INCHES IN |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Taper Major Nominal Diameter | 2.498 INCHES BOTH ENDS IN |
| Material Document and Classification | 66,AISI/SAE 4615 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 9.4176 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 9.750 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.500 INCHES BOTH ENDS IN |
| Pressure Angle | 17.5000 DEGREES |
| Material | STEEL COMP 4615 OVERALL |
| Face Nominal Width | 2.562 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 |
|---|---|
| A5312 | 3/9 Design control — primary reference Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
NSN 3020-00-294-8573 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-294-8573: Keyway Nominal Width: 0.500 INCHES BOTH ENDS IN; Hub Nominal Diameter: 3.125 INCHES FIRST END IN; Hub Nominal Diameter: 3.625 INCHES SECOND END IN; Teeth Quantity: 55. 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.