The Gear,spur, cataloged under National Stock Number 3020-00-540-8640, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-540-8640 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 3.1650 INCHES BOTH ENDS IN |
| Teeth Quantity | 26 |
| Body Style | PLAIN, SOLID |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Hardness Rating | 57.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | HUBLESS |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.2000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Spline Quantity | 12 BOTH ENDS |
| Nominal Outside Diameter | 5.3950 INCHES IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8620H OVERALL |
| Spline Pitch Diameter | 3.0000 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 1.860 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 |
| Reference | Meaning |
|---|---|
| 722118 | 5/9 Secondary reference American Standard Inc Westinghouse Air Brake Co Div |
| 722118 | 3/9 Design control — primary reference Wabco Construction and Mining Equipment Group Indianapolis Plant an American Standard Inc Co |
NSN 3020-00-540-8640 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-540-8640: Bore Nominal Diameter: 3.1650 INCHES BOTH ENDS IN; Teeth Quantity: 26; Body Style: PLAIN, SOLID; Bore Style: INVOLUTE SPLINE BOTH ENDS. 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.