The Shaft Assembly,flexible, cataloged under National Stock Number 1680-00-554-5470, 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29 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 1680-00-554-5470 |
| Item Name | Shaft Assembly,flexible |
| FSC / FSG | 1680 / 16 — Miscellaneous Aircraft Accessories and Components |
| Status | ACTIVE |
| FSC Application Data | RADIO SET,RADIO COMMUNICATIONS EQUIPMENT,AIRBORNE |
| Spline Type | INVOLUTE BOTH ENDS |
| Cross Section Size and Location | 0.344 INCHES NOMINAL DIAMETER BOTH ENDS IN |
| End Overall Diameter | 0.625 INCHES NOMINAL BOTH ENDS IN |
| End Connection Type | THREADED INTERNAL BOTH ENDS |
| Spline Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM BOTH ENDS IN |
| Thread Depth | 0.2425 INCHES MINIMUM AND 0.2585 INCHES MAXIMUM BOTH ENDS IN |
| Pitch Diameter | 0.212 INCHES MINIMUM AND 0.214 INCHES MAXIMUM BOTH ENDS IN |
| Spline Major Diameter | 0.240 INCHES MINIMUM AND 0.242 INCHES MAXIMUM BOTH ENDS IN |
| Thread Location | INTERNAL BOTH ENDS |
| Core Diameter | 0.145 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Torsional Deflection Rating | 7 DEG FT-LB IN. TORSIONAL DEFLECTION RATING IN WINDING AND UNWINDING DIRECTION |
| Thread Direction | RIGHT-HAND BOTH ENDS |
| Spline Pressure Angle in Deg | 14.5 BOTH ENDS |
| Spline Quantity | 15 BOTH ENDS |
| Core Rotation Direction | CLOCKWISE |
| Nondefinitive Spec/std Data | AMC-215 TYPE |
| Core Removability | REMOVABLE |
| Screw Thread Series Designator | UNS BOTH ENDS |
| Surface Treatment | ZINC CASING |
| Protective Coating Method | COATED CASING |
| Wrenching Facility Outside Diameter | 0.625 INCHES NOMINAL BOTH ENDS IN |
| Thread Class | 2 BOTH ENDS |
| Wrenching Facility Type | KNURLED SURFACE BOTH ENDS |
| Material | STEEL CORE |
| Material | STEEL CASING |
| Casing Outside Diameter | 0.330 INCHES NOMINAL IN |
| End Type | ROUND, INTERNAL SPLINED BOTH ENDS |
| Tip Length | 0.437 INCHES NOMINAL 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 |
| Reference | Meaning |
|---|---|
| MC215 | 3/1 Design control — primary reference U.S. Government activity |
| MILS3644AMENDITYPEM6215 | 4/1 Identification reference U.S. Government activity |
NSN 1680-00-554-5470 is a Shaft Assembly,flexible, classified under FSC 1680, Miscellaneous Aircraft Accessories and Components. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 3120-01-027-6340. Verify interchangeability with system specifications before substitution.
Key specifications for 1680-00-554-5470: FSC Application Data: RADIO SET,RADIO COMMUNICATIONS EQUIPMENT,AIRBORNE; Spline Type: INVOLUTE BOTH ENDS; Cross Section Size and Location: 0.344 INCHES NOMINAL DIAMETER BOTH ENDS IN; End Overall Diameter: 0.625 INCHES NOMINAL 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.
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.