The Coupling,shaft,flexible, cataloged under National Stock Number 3010-01-428-3121, is classified within Federal Supply Class 3010 (Torque Converters and Speed Changers) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Rexnord Industries Llc. Government technical data includes 19 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3010-01-428-3121 |
| Primary Part Number | 1050T31 1.780/TB 1.298-1.375 |
| Item Name | Coupling,shaft,flexible |
| FSC / FSG | 3010 / 30 — Torque Converters and Speed Changers |
| Manufacturer | Rexnord Industries Llc |
| Status | ACTIVE |
| Keyway Depth | 0.5000 INCHES NOMINAL FIRST END IN |
| Keyway Depth | 0.3120 INCHES NOMINAL SECOND END IN |
| Securing Method | THREADED HOLE(S) BOTH ENDS |
| Threaded Hole Location | BOTH ENDS: OVER KEYWAY |
| Bore Length | 2.3800 INCHES NOMINAL BOTH ENDS IN |
| Design Type | GRID SPRING |
| Taper Minor Diameter | 1.2980 INCHES NOMINAL SECOND END IN |
| Keying Facility Type | KEYWAY BOTH ENDS |
| Outside Diameter | 5.440 INCHES NOMINAL IN |
| Features Provided | KEYWAY AND EXPOSED COUPLING BOLT TYPE AND TAPERED GRID SPRING |
| Bore Shape | TAPERED SECOND END |
| Bore Shape | STRAIGHT FIRST END |
| Keying Facility Quantity | 1 BOTH ENDS |
| Taper Largest Diameter | 1.3750 INCHES NOMINAL SECOND END IN |
| Threaded Hole Quantity | 1 BOTH ENDS |
| Keyway Width | 0.500 INCHES NOMINAL FIRST END IN |
| Keyway Width | 0.312 INCHES NOMINAL SECOND END IN |
| Bore Diameter | 1.7800 INCHES NOMINAL FIRST END IN |
| Furnished Items and Quantity | GRID COVER 1 |
| 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 |
|---|---|
| 1050T31 1.780/TB 1.298-1.375 PRIMARY | Rexnord Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| 1050T31 TAPERED BORE | 3/1 Design control — primary reference Rexnord Industries Llc |
NSN 3010-01-428-3121 is a Coupling,shaft,flexible, manufactured by Rexnord Industries Llc, classified under FSC 3010, Torque Converters and Speed Changers. Status: active.
NSN 3010-01-428-3121 has 1 manufacturer part number on file: 1050T31 1.780/TB 1.298-1.375 (Rexnord Industries Llc).
Key specifications for 1050T31 1.780/TB 1.298-1.375: Keyway Depth: 0.5000 INCHES NOMINAL FIRST END IN; Keyway Depth: 0.3120 INCHES NOMINAL SECOND END IN; Securing Method: THREADED HOLE(S) BOTH ENDS; Threaded Hole Location: BOTH ENDS: OVER KEYWAY. 19 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.