The Gear,spur, cataloged under National Stock Number 3020-01-425-3639, 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 Walker Power Systems, Inc. Dba Tiernay Turbines. Government technical data includes 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-425-3639 |
| Primary Part Number | 107604-1 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Walker Power Systems, Inc. Dba Tiernay Turbines |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.410 INCHES BOTH ENDS IN |
| Teeth Quantity | 149 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 0.577 INCHES SECOND COUNTERBORE FIRST END IN |
| Counterbore Nominal Diameter | 0.740 INCHES FIRST COUNTERBORE FIRST END IN |
| Bore Style | W/STEPPED COUNTERBORE BOTH ENDS |
| Mounting Hole Type and Quantity | 1 PLAIN TRANSVERSELY THROUGH HUB SECOND END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.776 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 1.284 INCHES FIRST END IN |
| First Step Nominal Length | 0.353 INCHES SECOND END IN |
| First Step Nominal Length | 0.357 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.126 INCHES TRANSVERSELY THROUGH HUB SECOND END IN |
| Hardness Rating | 23.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM TEETH |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM BORE SURFACE |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | AMS6260 SAE 9310 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.2083 INCHES NOMINAL IN |
| First Step Nominal Diameter | 1.580 INCHES FIRST END IN |
| First Step Nominal Diameter | 1.580 INCHES SECOND END IN |
| Hub Style Designator | 1 STEP BOTH ENDS |
| End Nominal Length | 0.420 INCHES SECOND END IN |
| End Nominal Length | 0.930 INCHES FIRST END IN |
| Nominal Outside Diameter | 6.286 INCHES IN |
| Surface Treatment | CARBON OVERALL |
| End Nominal Diameter | 1.378 INCHES FIRST END IN |
| End Nominal Diameter | 1.378 INCHES SECOND END IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL COMP E9310 OVERALL |
| Counterbore Nominal Depth | 0.780 INCHES SECOND COUNTERBORE FIRST END 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 |
|---|---|
| 107604-1 | General Dynamics Robotic Systems Inc Div General Dynamics Land Systems Inc. (USA) |
| 107604-1 PRIMARY | Walker Power Systems, Inc. Dba Tiernay Turbines (USA) |
| Reference | Meaning |
|---|---|
| 107604 | D/9 Drawing number reference only Walker Power Systems, Inc. Dba Tiernay Turbines |
NSN 3020-01-425-3639 is a Gear,spur, manufactured by Walker Power Systems, Inc. Dba Tiernay Turbines, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-425-3639 has 2 manufacturer part numbers on file: 107604-1 (General Dynamics Robotic Systems Inc Div General Dynamics Land Systems Inc.), 107604-1 (Walker Power Systems, Inc. Dba Tiernay Turbines).
Key specifications for 107604-1: Bore Nominal Diameter: 0.410 INCHES BOTH ENDS IN; Teeth Quantity: 149; Body Style: PLAIN, SOLID; Counterbore Nominal Diameter: 0.577 INCHES SECOND COUNTERBORE FIRST END IN. 29 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.