The Gear,helical, cataloged under National Stock Number 3020-00-200-2143, 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 Bay City Shovels, Inc. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-200-2143 |
| Primary Part Number | H1607B849 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Bay City Shovels, Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.951 INCHES BOTH ENDS IN |
| Helix Angle | 11.2499 DEGREES |
| Hub Nominal Diameter | 4.250 INCHES SECOND END IN |
| Teeth Quantity | 35 |
| Body Style | WEBBED, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 2.047 INCHES FIRST END IN |
| First Step Nominal Length | 0.703 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Pitch Diameter | 11.8950 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 4.250 INCHES FIRST END IN |
| Hub Style Designator | PLAIN SECOND END |
| Spline Quantity | 10 BOTH ENDS |
| End Nominal Length | 1.188 INCHES FIRST END IN |
| Nominal Outside Diameter | 12.561 INCHES IN |
| End Nominal Diameter | 3.438 INCHES FIRST END IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 2.500 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 |
NSN 3020-00-200-2143 is a Gear,helical, manufactured by Bay City Shovels, Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-200-2143 has 2 manufacturer part numbers on file: H1607B849 (Bay City Shovels, Inc), B849 (Bay City Shovels, Inc).
1 possible match (shared part number, not a government interchangeability claim): 2540-01-125-0124. Verify interchangeability with system specifications before substitution.
Key specifications for H1607B849: Bore Nominal Diameter: 2.951 INCHES BOTH ENDS IN; Helix Angle: 11.2499 DEGREES; Hub Nominal Diameter: 4.250 INCHES SECOND END IN; Teeth Quantity: 35. 22 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.