The Shaft Assembly,flexible, cataloged under National Stock Number 1680-00-536-7786, is classified within Federal Supply Class 1680 (Miscellaneous Aircraft Accessories and Components) of the Aircraft Components and Accessories group. The manufacturer of record is Safran Power Usa Llc. Government technical data includes 29 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1680-00-536-7786 |
| Primary Part Number | 31551-026-04 |
| Item Name | Shaft Assembly,flexible |
| FSC / FSG | 1680 / 16 — Miscellaneous Aircraft Accessories and Components |
| Manufacturer | Safran Power Usa Llc |
| Status | ACTIVE |
| FSC Application Data | MISCELLANEOUS ACFT ACCESSORIES AND COMPONENTS |
| Width Across Flats | 0.750 INCHES NOMINAL BOTH ENDS IN |
| Spline Type | INVOLUTE BOTH ENDS |
| Cross Section Size and Location | 0.406 INCHES NOMINAL DIAMETER BOTH ENDS IN |
| End Overall Diameter | 0.875 INCHES NOMINAL BOTH ENDS IN |
| End Connection Type | UNION FERRULE BOTH ENDS |
| Spline Length | 0.244 INCHES NOMINAL BOTH ENDS IN |
| Thread Depth | 0.281 INCHES NOMINAL BOTH ENDS IN |
| Pitch Diameter | 0.250 INCHES NOMINAL BOTH ENDS IN |
| Spline Major Diameter | 0.307 INCHES NOMINAL BOTH ENDS IN |
| Thread Location | INTERNAL BOTH ENDS |
| Core Diameter | 0.250 INCHES NOMINAL IN |
| Torsional Deflection Rating | 5 DEG FT-LB IN. IN WINDING DIRECTION,7 DEG FT-LB IN. IN UNWINDING DIRECTION |
| Thread Direction | RIGHT-HAND BOTH ENDS |
| Spline Pressure Angle in Deg | 14.5 BOTH ENDS |
| Spline Quantity | 12 BOTH ENDS |
| Casing Length Between Ferrules | 24.500 INCHES NOMINAL IN |
| Core Rotation Direction | CLOCKWISE OR COUNTERCLOCKWISE |
| Shank Outside Diameter | 0.500 INCHES NOMINAL BOTH ENDS IN |
| Core Removability | NONREMOVABLE |
| Core Overall Length | 27.186 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNF BOTH ENDS |
| Thread Class | 2B BOTH ENDS |
| Minor Diameter | UNABLE TO DECODE |
| Wrenching Facility Type | HEXAGON BOTH ENDS |
| Material | STEEL CORE |
| Material | STEEL CASING |
| Casing Outside Diameter | 0.445 INCHES NOMINAL IN |
| Minimum Operating Radius | 10.000 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 31551-026-04 PRIMARY | Safran Power Usa Llc (USA) |
| Reference | Meaning |
|---|---|
| 31551-026-04 | 3/9 Design control — primary reference Lucas Aerospace Power Equipment Corporation |
| 635087-13 | 5/2 Secondary reference U.S. Government activity |
NSN 1680-00-536-7786 is a Shaft Assembly,flexible, manufactured by Safran Power Usa Llc, classified under FSC 1680, Miscellaneous Aircraft Accessories and Components. Status: active.
NSN 1680-00-536-7786 has 1 manufacturer part number on file: 31551-026-04 (Safran Power Usa Llc).
Key specifications for 31551-026-04: FSC Application Data: MISCELLANEOUS ACFT ACCESSORIES AND COMPONENTS; Width Across Flats: 0.750 INCHES NOMINAL BOTH ENDS IN; Spline Type: INVOLUTE BOTH ENDS; Cross Section Size and Location: 0.406 INCHES NOMINAL DIAMETER BOTH ENDS IN. 29 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.
NSN 1680-00-536-7786 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.