The Gear,spur, cataloged under National Stock Number 3020-01-312-1975, 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 Timken Gears & Services Inc. Div Philadelphia Gear. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-312-1975 |
| Primary Part Number | 40-105-0139-2 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Timken Gears & Services Inc. Div Philadelphia Gear |
| Status | ACTIVE |
| Material | STEEL COMP 4140 OVERALL |
| 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 |
|---|---|
| 40-105-0139-2 PRIMARY | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| 01-034-0055A ITEM 3-11 | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| Reference | Meaning |
|---|---|
| 01-034-0055A | D/9 Drawing number reference only Timken Gears & Services Inc. Div Philadelphia Gear |
NSN 3020-01-312-1975 is a Gear,spur, manufactured by Timken Gears & Services Inc. Div Philadelphia Gear, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-312-1975 has 2 manufacturer part numbers on file: 40-105-0139-2 (Timken Gears & Services Inc. Div Philadelphia Gear), 01-034-0055A ITEM 3-11 (Timken Gears & Services Inc. Div Philadelphia Gear).
2 possible matches (shared part number, not a government interchangeability claim): 3020-01-312-1976, 3020-01-312-1977. Verify interchangeability with system specifications before substitution.
Key specifications for 40-105-0139-2: Material: STEEL COMP 4140 OVERALL. 1 specification is 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.