The Gear,helical, cataloged under National Stock Number 3020-00-308-9928, 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 Siemens Energy, Inc.. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-308-9928 |
| Primary Part Number | MC264B |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.249 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.406 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 2.250 INCHES FIRST END IN |
| Hub Nominal Diameter | 2.250 INCHES SECOND END IN |
| Teeth Quantity | 9 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Nominal Distance Between Body Face and Protruding Hub End | 0.063 INCHES BOTH ENDS IN |
| Teeth Type | SINGLE HELIX |
| Nominal Overall Length | 1.000 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-890,CLASS BS MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 3.1520 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 3.434 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.828 INCHES BOTH ENDS IN |
| Pressure Angle | 15.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.875 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 |
|---|---|
| MC264B PRIMARY | Siemens Energy, Inc. (USA) |
NSN 3020-00-308-9928 is a Gear,helical, manufactured by Siemens Energy, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-308-9928 has 1 manufacturer part number on file: MC264B (Siemens Energy, Inc.).
Key specifications for MC264B: Keyway Nominal Width: 0.249 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.406 INCHES BOTH ENDS IN; Hub Nominal Diameter: 2.250 INCHES FIRST END IN; Hub Nominal Diameter: 2.250 INCHES SECOND END IN. 19 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.