The Shaft Assembly,flexible, cataloged under National Stock Number 1680-00-528-1337, is classified within Federal Supply Class 1680 (Miscellaneous Aircraft Accessories and Components) of the Aircraft Components and Accessories group. The manufacturer of record is Smith and Smith Aircraft Co. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1680-00-528-1337 |
| Primary Part Number | M4241-5950 |
| Item Name | Shaft Assembly,flexible |
| FSC / FSG | 1680 / 16 — Miscellaneous Aircraft Accessories and Components |
| Manufacturer | Smith and Smith Aircraft Co |
| Status | ACTIVE |
| FSC Application Data | ELECTRIC WING FLAP INSTRUMENT AIRPLANE |
| Width Across Flats | 0.750 INCHES NOMINAL BOTH ENDS IN |
| Spline Type | INVOLUTE BOTH ENDS |
| Cross Section Size and Location | 0.409 INCHES NOMINAL DIAMETER BOTH ENDS IN |
| End Overall Diameter | 0.875 INCHES NOMINAL BOTH ENDS IN |
| Thread Length | 0.310 INCHES NOMINAL BOTH ENDS IN |
| End Connection Type | THREADED INTERNAL BOTH ENDS |
| Spline Length | 0.275 INCHES NOMINAL BOTH ENDS IN |
| Pitch Diameter | 0.250 INCHES NOMINAL BOTH ENDS IN |
| Spline Major Diameter | 0.310 INCHES NOMINAL BOTH ENDS IN |
| Thread Location | INTERNAL BOTH ENDS |
| Core Diameter | 0.199 INCHES NOMINAL IN |
| Torsional Deflection Rating | 4 DEG IN. LB AND 6 DEG PER IN. LB |
| Thread Direction | RIGHT-HAND BOTH ENDS |
| Spline Pressure Angle in Deg | 14.5 BOTH ENDS |
| Spline Quantity | 12 BOTH ENDS |
| Casing Length Between Ferrules | 59.500 INCHES NOMINAL IN |
| Core Rotation Direction | CLOCKWISE OR COUNTERCLOCKWISE |
| Core Removability | NONREMOVABLE |
| Core Overall Length | 60.500 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNS BOTH ENDS |
| Thread Class | 2 BOTH ENDS |
| Minor Diameter | UNABLE TO DECODE |
| Wrenching Facility Type | HEXAGON BOTH ENDS |
| Material | STEEL CORE |
| Material | STEEL CASING |
| Casing Outside Diameter | 0.313 INCHES NOMINAL IN |
| Minimum Operating Radius | 4.500 INCHES IN |
| End Type | ROUND, INTERNAL SPLINED BOTH ENDS |
| 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 |
|---|---|
| M4241-5950 PRIMARY | Smith and Smith Aircraft Co (USA) |
NSN 1680-00-528-1337 is a Shaft Assembly,flexible, manufactured by Smith and Smith Aircraft Co, classified under FSC 1680, Miscellaneous Aircraft Accessories and Components. Status: active.
NSN 1680-00-528-1337 has 1 manufacturer part number on file: M4241-5950 (Smith and Smith Aircraft Co).
Key specifications for M4241-5950: FSC Application Data: ELECTRIC WING FLAP INSTRUMENT AIRPLANE; Width Across Flats: 0.750 INCHES NOMINAL BOTH ENDS IN; Spline Type: INVOLUTE BOTH ENDS; Cross Section Size and Location: 0.409 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.
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.