The Gear,spur, cataloged under National Stock Number 3020-01-435-8707, 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 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-435-8707 |
| Primary Part Number | 2B1-579 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Lake Shore Systems, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 1.000 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 4.751 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 8.000 INCHES BOTH ENDS IN |
| Teeth Quantity | 112 |
| Body Style | SPOKED |
| Bore Style | W/ 2 KEYWAYS BOTH ENDS |
| Precision Classification | ACCURACY GRADE 7 |
| Style Designator | FLUSH HUB |
| Material Document and Classification | MIL-S-1508-B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 28.0000 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 28.400 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 3.826 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Face Nominal Width | 4.000 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 |
|---|---|
| 2B1-579 PRIMARY | Lake Shore Systems, Inc. (USA) |
| 2D3-05842 ITEM NO 51 | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 2D3-05842 | D/9 Drawing number reference only Lake Shore Systems, Inc. |
NSN 3020-01-435-8707 is a Gear,spur, manufactured by Lake Shore Systems, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-435-8707 has 2 manufacturer part numbers on file: 2B1-579 (Lake Shore Systems, Inc.), 2D3-05842 ITEM NO 51 (Lake Shore Systems, Inc.).
4 possible matches (shared part number, not a government interchangeability claim): 3040-01-435-8814, 3020-01-435-8818, 3020-01-435-9074. Verify interchangeability with system specifications before substitution.
Key specifications for 2B1-579: Keyway Nominal Width: 1.000 INCHES BOTH ENDS IN; Bore Nominal Diameter: 4.751 INCHES BOTH ENDS IN; Hub Nominal Diameter: 8.000 INCHES BOTH ENDS IN; Teeth Quantity: 112. 16 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.