The Gear,spur, cataloged under National Stock Number 3020-00-027-1827, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-027-1827 |
| Primary Part Number | 6770905 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Allison Transmission Inc Dba Allison Transmission, Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.5202 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 3.1495 INCHES BOTH ENDS IN |
| Teeth Quantity | 41 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.983 INCHES BOTH ENDS IN |
| Hardness Rating | 90.0 ROCKWELL SUPERFICIAL 15-N NOMINAL OVERALL |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | FED STD 66,AISI/SAE 5140 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 9.5000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 40 BOTH ENDS |
| Nominal Outside Diameter | 10.2450 INCHES IN |
| Pressure Angle | 25.0000 DEGREES |
| Material | STEEL COMP 5140 OVERALL |
| Spline Pitch Diameter | 2.5000 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 1.9700 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 |
|---|---|
| 6770905 PRIMARY | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| Reference | Meaning |
|---|---|
| 162322H1 | 5/9 Secondary reference Komatsu American Intl Co |
| 162322 | 5/9 Secondary reference Komatsu American Intl Co |
| 6770905 | 5/9 Secondary reference General Motors Corp |
NSN 3020-00-027-1827 is a Gear,spur, manufactured by Allison Transmission Inc Dba Allison Transmission, Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-027-1827 has 1 manufacturer part number on file: 6770905 (Allison Transmission Inc Dba Allison Transmission, Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5950-01-028-5924, 5930-01-378-2567, 4140-01-560-1630. Verify interchangeability with system specifications before substitution.
Key specifications for 6770905: Bore Nominal Diameter: 2.5202 INCHES BOTH ENDS IN; Hub Nominal Diameter: 3.1495 INCHES BOTH ENDS IN; Teeth Quantity: 41; Body Style: WEBBED, WITH LIGHTENING HOLES. 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.