The Gear,spur, cataloged under National Stock Number 3020-01-258-9455, 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 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-258-9455 |
| Primary Part Number | 3051G42-001 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Timken Gears & Services Inc. Div Philadelphia Gear |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.750 INCHES FIRST END IN |
| Hub Nominal Diameter | 2.250 INCHES FIRST END IN |
| Teeth Quantity | 41 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN FIRST END |
| Mounting Hole Type and Quantity | 2 THREADED TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.440 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 4.1000 INCHES NOMINAL IN |
| Hub Style Designator | PINNED FIRST END |
| Mounting Hole Nominal Thread Size | 0.100 INCHES TRANSVERSELY THROUGH HUB BETWEEN FIRSTEND FLANGE AND BODY IN |
| Nominal Outside Diameter | 4.295 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Mounting Hole Thread Series Designator | UNF AXIALLY THROUGH HUB FIRST END |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.380 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 |
|---|---|
| 3051G42-001 PRIMARY | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| 3051G42-1 | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| Reference | Meaning |
|---|---|
| 3051G42 | D/9 Drawing number reference only General Electric Company |
| 3051G42-001 | 5/9 Secondary reference General Electric Company |
NSN 3020-01-258-9455 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 3020-01-258-9455 has 2 manufacturer part numbers on file: 3051G42-001 (Timken Gears & Services Inc. Div Philadelphia Gear), 3051G42-1 (Timken Gears & Services Inc. Div Philadelphia Gear).
Key specifications for 3051G42-001: Bore Nominal Diameter: 1.750 INCHES FIRST END IN; Hub Nominal Diameter: 2.250 INCHES FIRST END IN; Teeth Quantity: 41; Body Style: PLAIN, SOLID. 17 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.