The Shaft Assembly,flexible, cataloged under National Stock Number 1680-00-540-3448, is classified within Federal Supply Class 1680 (Miscellaneous Aircraft Accessories and Components) of the Aircraft Components and Accessories group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1680-00-540-3448 |
| Item Name | Shaft Assembly,flexible |
| FSC / FSG | 1680 / 16 — Miscellaneous Aircraft Accessories and Components |
| Status | ACTIVE |
| FSC Application Data | FLAP ACTUATING SYSTEM INSTALLATION AIRCRAFT |
| Width Across Flats | 0.750 INCHES NOMINAL FIRST END IN |
| Spline Type | INVOLUTE FIRST END |
| Cross Section Size and Location | 0.406 INCHES NOMINAL DIAMETER FIRST END IN |
| End Overall Diameter | 0.875 INCHES NOMINAL FIRST END IN |
| End Connection Type | THREADED INTERNAL FIRST END |
| Spline Length | 0.232 INCHES MINIMUM AND 0.242 INCHES MAXIMUM FIRST END IN |
| Thread Depth | 0.281 INCHES NOMINAL FIRST END IN |
| Pitch Diameter | 0.250 INCHES NOMINAL FIRST END IN |
| Spline Major Diameter | 0.304 INCHES MINIMUM AND 0.310 INCHES MAXIMUM FIRST END IN |
| Thread Location | INTERNAL FIRST END |
| Core Diameter | 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN |
| Torsional Deflection Rating | 1.2 FT-LB IN. TORSIONAL DEFLECTION RATING IN WINDING DIRECTION,2.0 FT-LB IN. IN UNWINDING DIRECTION FT |
| Thread Direction | RIGHT-HAND FIRST END |
| Spline Pressure Angle in Deg | 14.5 FIRST END |
| Spline Quantity | 12 FIRST END |
| Casing Length Between Ferrules | 11.000 INCHES NOMINAL IN |
| Core Rotation Direction | CLOCKWISE OR COUNTERCLOCKWISE |
| Shank Outside Diameter | 0.625 INCHES NOMINAL FIRST END IN |
| Core Removability | NONREMOVABLE |
| Core Overall Length | 11.9062 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNS FIRST END |
| Thread Class | 2B FIRST END |
| Wrenching Facility Type | HEXAGON FIRST END |
| Material | STEEL CORE |
| Material | STEEL CORROSION RESISTING CASING |
| Casing Outside Diameter | 0.544 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN |
| Minimum Operating Radius | 20.000 INCHES IN |
| End Type | ROUND, INTERNAL SPLINED FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 31556-011-00 | 3/9 Design control — primary reference Lucas Aerospace Power Equipment Corporation |
| 31556-011-00 | 5/9 Secondary reference Ge Aviation Systems Llc |
NSN 1680-00-540-3448 is a Shaft Assembly,flexible, classified under FSC 1680, Miscellaneous Aircraft Accessories and Components. Status: active.
Key specifications for 1680-00-540-3448: FSC Application Data: FLAP ACTUATING SYSTEM INSTALLATION AIRCRAFT; Width Across Flats: 0.750 INCHES NOMINAL FIRST END IN; Spline Type: INVOLUTE FIRST END; Cross Section Size and Location: 0.406 INCHES NOMINAL DIAMETER FIRST END 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 1680-00-540-3448 has DEMIL Code Q. 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.