The Gear,spur, cataloged under National Stock Number 3020-01-145-5673, 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 Altra Industrial Motion Corp.. Government technical data includes 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-145-5673 |
| Primary Part Number | YD21 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Altra Industrial Motion Corp. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.095 INCHES BOTH ENDS0.095 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.751 INCHES BOTH ENDS0.751 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.391 INCHES FIRST END1.391 INCHES FIRST END IN |
| Teeth Quantity | 2121 |
| Body Style | PLAIN, SOLIDPLAIN, SOLID |
| Bore Style | W/ KEYWAY BOTH ENDSW/ KEYWAY BOTH ENDS |
| Mounting Hole Type and Quantity | 2 THREADED AXIALLY THROUGH BODY FIRST END2 THREADED AXIALLY THROUGH BODY FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.625 INCHES FIRST END0.625 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBPROTRUDING HUB |
| Pitch Diameter | 1.7500 INCHES NOMINAL1.7500 INCHES NOMINAL IN |
| Tooth Form | STANDARDSTANDARD |
| Hub Style Designator | PLAIN FIRST ENDPLAIN FIRST END |
| Mounting Hole Nominal Thread Size | 0.190 INCHES AXIALLY THROUGH BODY FIRST END0.190 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Nominal Outside Diameter | 1.917 INCHES1.917 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.471 INCHES BOTH ENDS0.471 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES20.0000 DEGREES |
| Material | STEEL OVERALL |
| Bolt Hole Circle Nominal Diameter | 1.190 INCHES AXIALLY THROUGH BODY FIRST END1.190 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH BODY FIRST ENDUNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH BODY FIRST END |
| Attachment Method | MOUNTING HOLEMOUNTING HOLE |
| Face Nominal Width | 1.000 INCHES1.000 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 |
|---|---|
| YD21 | Altra Industrial Motion Corp. (USA) |
| Reference | Meaning |
|---|---|
| CV60-703-2298083 | D/9 Drawing number reference only U.S. Government activity |
| 703-2298083 PIECE 6 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-145-5673 is a Gear,spur, manufactured by Altra Industrial Motion Corp., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-145-5673 has 1 manufacturer part number on file: YD21 (Altra Industrial Motion Corp.).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-210-6999. Verify interchangeability with system specifications before substitution.
Key specifications for YD21: Keyway Nominal Width: 0.095 INCHES BOTH ENDS0.095 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.751 INCHES BOTH ENDS0.751 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.391 INCHES FIRST END1.391 INCHES FIRST END IN; Teeth Quantity: 2121. 21 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.