The Gear,helical, cataloged under National Stock Number 3020-00-540-1608, 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 Cotta Transmission Co Llc. Government technical data includes 20 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 | 3020-00-540-1608 |
| Primary Part Number | SR-433-A |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Cotta Transmission Co Llc |
| Status | ACTIVE |
| Keyway Nominal Width | 0.6255 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 2.8755 INCHES BOTH ENDS IN |
| Helix Angle | 15.6498 DEGREES |
| Hub Nominal Diameter | 4.0000 INCHES BOTH ENDS IN |
| Teeth Quantity | 54 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | LEFT |
| Bore Style | W/ 2 KEYWAYS BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | FLUSH HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 11.2150 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 11.4475 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 1.6953 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4820 OVERALL |
| Face Nominal Width | 3.500 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 |
|---|---|
| SR-433-A PRIMARY | Cotta Transmission Co Llc (USA) |
NSN 3020-00-540-1608 is a Gear,helical, manufactured by Cotta Transmission Co Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-540-1608 has 1 manufacturer part number on file: SR-433-A (Cotta Transmission Co Llc).
Key specifications for SR-433-A: Keyway Nominal Width: 0.6255 INCHES BOTH ENDS IN; Bore Nominal Diameter: 2.8755 INCHES BOTH ENDS IN; Helix Angle: 15.6498 DEGREES; Hub Nominal Diameter: 4.0000 INCHES BOTH ENDS IN. 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.