The Gear,spur, cataloged under National Stock Number 3020-00-446-2485, 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 Lake Shore Systems, Inc.. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-446-2485 |
| Primary Part Number | 8351190 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Lake Shore Systems, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.655 INCHES BOTH ENDS IN |
| Teeth Quantity | 51 |
| Body Style | WEBBED, OFFSET, SOLID |
| Counterbore Nominal Diameter | 3.770 INCHES FIRST END IN |
| Bore Style | INVOLUTE SPLINE FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 1.560 INCHES FIRST END IN |
| First Step Nominal Length | 0.370 INCHES FIRST END IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 3.150 INCHES IN |
| Style Designator | PROTRUDING HUB, RECESSED BODY |
| Material Document and Classification | MIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 10.2000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 6.250 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Spline Quantity | 57 BOTH ENDS |
| End Nominal Length | 0.670 INCHES FIRST END IN |
| Nominal Outside Diameter | 10.495 INCHES IN |
| End Nominal Diameter | 4.270 INCHES FIRST END IN |
| Pressure Angle | 10.0000 DEGREES |
| Material | STEEL COMP 8640 OVERALL |
| Counterbore Nominal Depth | 0.140 INCHES FIRST END IN |
| Spline Pitch Diameter | 3.5625 INCHES NOMINAL BOTH ENDS IN |
| Body Recess Nominal Depth | 1.340 INCHES SECOND END IN |
| Face Nominal Width | 1.590 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 8351190 PRIMARY | Lake Shore Systems, Inc. (USA) |
| 8351190 PRIMARY | Midwest Gear & Tool, Inc. (USA) |
| 715243 PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| Reference | Meaning |
|---|---|
| 8351190 | 5/9 Secondary reference U.S. Government activity |
| 8351190 | 5/9 Secondary reference U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 3020-00-446-2485 is a Gear,spur, manufactured by Lake Shore Systems, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-446-2485 has 3 manufacturer part numbers on file: 8351190 (Lake Shore Systems, Inc.), 8351190 (Midwest Gear & Tool, Inc.), 715243 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
2 possible matches (shared part number, not a government interchangeability claim): 5910-01-221-9889, 3040-01-383-5291. Verify interchangeability with system specifications before substitution.
Key specifications for 8351190: Bore Nominal Diameter: 3.655 INCHES BOTH ENDS IN; Teeth Quantity: 51; Body Style: WEBBED, OFFSET, SOLID; Counterbore Nominal Diameter: 3.770 INCHES FIRST END IN. 25 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.
NSN 3020-00-446-2485 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.