The Gear,worm, cataloged under National Stock Number 3020-00-477-5984, 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 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-477-5984 |
| Primary Part Number | 6771177 |
| Item Name | Gear,worm |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Allison Transmission Inc Dba Allison Transmission, Inc |
| Status | ACTIVE |
| Thread Form Direction | LEFT-HAND |
| Bore Nominal Diameter | 2.592 INCHES BOTH ENDS IN |
| Helix Angle | 84.4519 DEGREES |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Face Type | STRAIGHT |
| Style Designator | HUBLESS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 3.4478 INCHES NOMINAL IN |
| Features Provided | CASEHARDENED |
| Spline Quantity | 40 BOTH ENDS |
| Thread Form Quantity | 8 |
| Nominal Outside Diameter | 3.525 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Spline Pitch Diameter | 2.5000 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 1.174 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 |
|---|---|
| 6771177 PRIMARY | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| Reference | Meaning |
|---|---|
| 6771177 | 5/9 Secondary reference Euclid Inc |
NSN 3020-00-477-5984 is a Gear,worm, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-477-5984 has 1 manufacturer part number on file: 6771177 (Allison Transmission Inc Dba Allison Transmission, Inc).
Key specifications for 6771177: Thread Form Direction: LEFT-HAND; Bore Nominal Diameter: 2.592 INCHES BOTH ENDS IN; Helix Angle: 84.4519 DEGREES; Bore Style: INVOLUTE SPLINE BOTH ENDS. 16 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.