The Gear,helical, cataloged under National Stock Number 3020-00-477-5867, 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 Allison Transmission Inc Dba Allison Transmission, Inc. Government technical data includes 18 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-477-5867 |
| Primary Part Number | 6771072 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Allison Transmission Inc Dba Allison Transmission, Inc |
| Status | ACTIVE |
| Keyway Nominal Width | 0.130 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.626 INCHES BOTH ENDS IN |
| Helix Angle | 9.0125 DEGREES |
| Teeth Quantity | 8 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 55.0 ROCKWELL C NOMINAL OVERALL |
| Style Designator | HUBLESS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 8617 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 1.3500 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 1.682 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.249 INCHES BOTH ENDS IN |
| Pressure Angle | 2.2961 DEGREES |
| Material | STEEL COMP 8617 OVERALL |
| Face Nominal Width | 0.497 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 3020-00-477-5867 is a Gear,helical, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-477-5867 has 2 manufacturer part numbers on file: 000493T (Kovatch Corp.), 6771072 (Allison Transmission Inc Dba Allison Transmission, Inc).
Key specifications for 6771072: Keyway Nominal Width: 0.130 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.626 INCHES BOTH ENDS IN; Helix Angle: 9.0125 DEGREES; Teeth Quantity: 8. 18 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.