The Gear Cluster, cataloged under National Stock Number 3020-00-324-9797, 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 Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-324-9797 |
| Primary Part Number | A624M |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp. |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.298 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 2.750 INCHES SECOND END IN |
| Hub Nominal Diameter | 3.250 INCHES FIRST END IN |
| Hub Nominal Diameter | 5.750 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 4.282 INCHES IN |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | PLAIN SECOND END |
| Hub Style Designator | 1 GROOVE FIRST END |
| Spline Quantity | 6 BOTH ENDS |
| Hub Nominal Length | 1.375 INCHES SECOND END IN |
| Hub Nominal Length | 0.250 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Hub Nominal Length | 0.532 INCHES FIRST END IN |
| Nominal Outside Diameter | 6.795 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 8.995 INCHES FIRST GEAR IN |
| Material | STEEL OVERALL |
| Construction | SOLID |
| 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 |
|---|---|
| A624M | Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp. (USA) |
| Reference | Meaning |
|---|---|
| A624M | 3/9 Design control — primary reference U.S. Government activity |
| 472700 | 5/9 Secondary reference Wabco Construction and Mining Equipment Group Indianapolis Plant an American Standard Inc Co |
NSN 3020-00-324-9797 is a Gear Cluster, manufactured by Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-324-9797 has 1 manufacturer part number on file: A624M (Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.).
1 possible match (shared part number, not a government interchangeability claim): 6340-01-390-0782. Verify interchangeability with system specifications before substitution.
Key specifications for A624M: Bore Nominal Diameter: 2.298 INCHES BOTH ENDS IN; Hub Nominal Diameter: 2.750 INCHES SECOND END IN; Hub Nominal Diameter: 3.250 INCHES FIRST END IN; Hub Nominal Diameter: 5.750 INCHES BETWEEN FIRST AND SECOND GEAR 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.