The Gear,spur, cataloged under National Stock Number 3020-01-187-3221, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-187-3221 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 5.354 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 6.190 INCHES FIRST END IN |
| Teeth Quantity | 57 |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 5.460 INCHES BOTH ENDS IN |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.725 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 8 |
| Hardness Rating | 78.0 ROCKWELL A NOMINAL OVERALL |
| Nominal Overall Length | 1.760 INCHES IN |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 6.0800 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 6.311 INCHES IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Pressure Angle | 22.5000 DEGREES |
| Material | STEEL CORROSION RESISTING OVERALL |
| Counterbore Nominal Depth | 0.660 INCHES BOTH ENDS IN |
| Face Nominal Width | 1.035 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 42357-70 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-187-3221 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-187-3221: Bore Nominal Diameter: 5.354 INCHES BOTH ENDS IN; Hub Nominal Diameter: 6.190 INCHES FIRST END IN; Teeth Quantity: 57; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 21 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.
NSN 3020-01-187-3221 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.