The Gear,spur, cataloged under National Stock Number 3020-00-317-6501, 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 Eastern Gear Corporation. Government technical data includes 23 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-317-6501 |
| Primary Part Number | EGC538191 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Eastern Gear Corporation |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.220 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.575 INCHES BOTH ENDS IN |
| Teeth Quantity | 36 |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 1.375 INCHES SECOND END IN |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.428 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 1.557 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM TEETH |
| Nominal Overall Length | 3.610 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 4.5000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 24 BOTH ENDS |
| Nominal Outside Diameter | 4.700 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8617 OVERALL |
| Counterbore Nominal Depth | 1.000 INCHES SECOND END IN |
| Spline Pitch Diameter | 1.2500 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 0.625 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 |
|---|---|
| 538191 | Tvh Parts Co. (USA) |
| EGC538191 PRIMARY | Eastern Gear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 538191 | 5/9 Secondary reference Lift Parts Mfg Co Inc Div of Echlin Mfg Co the |
| 538191 | 5/9 Secondary reference Teledyne Industries Inc Teledyne Power Systems Div |
| 538191 | 5/9 Secondary reference Aircraft Supplies |
NSN 3020-00-317-6501 is a Gear,spur, manufactured by Eastern Gear Corporation, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-317-6501 has 2 manufacturer part numbers on file: 538191 (Tvh Parts Co.), EGC538191 (Eastern Gear Corporation).
1 possible match (shared part number, not a government interchangeability claim): 6750-01-427-5179. Verify interchangeability with system specifications before substitution.
Key specifications for EGC538191: Bore Nominal Diameter: 1.220 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.575 INCHES BOTH ENDS IN; Teeth Quantity: 36; Body Style: WEBBED, SOLID. 23 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.