The Gear,spur, cataloged under National Stock Number 3020-00-455-2979, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 3020-00-455-2979 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.3753 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.500 INCHES SECOND END IN |
| Hub Nominal Diameter | 0.4991 INCHES FIRST END IN |
| Teeth Quantity | 46 |
| Clamping Surface Nominal Length | 0.430 INCHES FIRST END IN |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.440 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Material Document and Classification | MIL-S-5626,COND B,SURFACE COND 2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.9167 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | SPLIT FIRST END |
| Hub Style Designator | PLAIN SECOND END |
| Nominal Outside Diameter | 1.9979 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Attachment Method | CLAMP |
| Face Nominal Width | 0.310 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 |
|---|---|
| G7157-137 | 3/2 Design control — primary reference U.S. Government activity |
| G7157-137 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 3020-00-455-2979 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-455-2979: Bore Nominal Diameter: 0.3753 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.500 INCHES SECOND END IN; Hub Nominal Diameter: 0.4991 INCHES FIRST END IN; Teeth Quantity: 46. 20 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.