The Coupling,shaft,flexible, cataloged under National Stock Number 3010-01-289-3907, is classified within Federal Supply Class 3010 (Torque Converters and Speed Changers) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Martin Sprocket and Gear Inc. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3010-01-289-3907 |
| Primary Part Number | 6020 |
| Item Name | Coupling,shaft,flexible |
| FSC / FSG | 3010 / 30 — Torque Converters and Speed Changers |
| Manufacturer | Martin Sprocket and Gear Inc |
| Status | ACTIVE |
| Securing Method | THREADED HOLE(S) BOTH ENDS |
| Threaded Hole Location | BOTH ENDS: OVER KEYWAY |
| Bore Length | 2.0000 INCHES NOMINAL BOTH ENDS IN |
| Design Type | ROLLER CHAIN |
| Keying Facility Type | KEYWAY BOTH ENDS |
| Outside Diameter | 5.500 INCHES NOMINAL IN |
| Features Provided | KEYWAY |
| Bore Shape | ROUGH STOCK BOTH ENDS |
| Keying Facility Quantity | 1 BOTH ENDS |
| Threaded Hole Quantity | 1 BOTH ENDS |
| Bore Diameter | 2.6250 INCHES MAXIMUM BOTH ENDS 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 |
|---|---|
| 6020 PRIMARY | Martin Sprocket and Gear Inc (USA) |
| Reference | Meaning |
|---|---|
| 6020 ROUGH BORE | 3/9 Design control — primary reference Martin Sprocket and Gear Inc |
NSN 3010-01-289-3907 is a Coupling,shaft,flexible, manufactured by Martin Sprocket and Gear Inc, classified under FSC 3010, Torque Converters and Speed Changers. Status: active.
NSN 3010-01-289-3907 has 1 manufacturer part number on file: 6020 (Martin Sprocket and Gear Inc).
Key specifications for 6020: Securing Method: THREADED HOLE(S) BOTH ENDS; Threaded Hole Location: BOTH ENDS: OVER KEYWAY; Bore Length: 2.0000 INCHES NOMINAL BOTH ENDS IN; Design Type: ROLLER CHAIN. 11 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.