The Shaft Assembly,flexible, cataloged under National Stock Number 1680-00-310-2123, is classified within Federal Supply Class 1680 (Miscellaneous Aircraft Accessories and Components) of the Aircraft Components and Accessories group. The manufacturer of record is Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division. Government technical data includes 27 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 1680-00-310-2123 |
| Primary Part Number | SC4139 |
| Item Name | Shaft Assembly,flexible |
| FSC / FSG | 1680 / 16 — Miscellaneous Aircraft Accessories and Components |
| Manufacturer | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division |
| Status | ACTIVE |
| FSC Application Data | ACFT CONTROL ASSY |
| Width Across Flats | 0.930 INCHES NOMINAL BOTH ENDS IN |
| Cross Section Size and Location | 0.245 INCHES MINIMUM ACROSS FLATS FIRST END IN |
| Cross Section Size and Location | 0.250 INCHES MAXIMUM ACROSS FLATS SECOND END IN |
| Casing Protective Device Type | BRAIDED WIRE SHIELD |
| End Overall Diameter | 0.930 INCHES NOMINAL BOTH ENDS IN |
| Thread Length | 0.437 INCHES NOMINAL BOTH ENDS IN |
| End Connection Type | THREADED INTERNAL BOTH ENDS |
| Thread Depth | 0.437 INCHES NOMINAL BOTH ENDS IN |
| Thread Location | INTERNAL BOTH ENDS |
| Core Diameter | 0.312 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND BOTH ENDS |
| Casing Length Between Ferrules | 10.095 INCHES MINIMUM AND 10.155 INCHES MAXIMUM IN |
| Core Rotation Direction | CLOCKWISE |
| Core Removability | REMOVABLE |
| Core Overall Length | 20.500 INCHES NOMINAL IN |
| Screw Thread Series Designator | UNEF BOTH ENDS |
| Surface Treatment | PASSIVATE CORE |
| Surface Treatment | PASSIVATE CASING |
| Thread Class | 2B BOTH ENDS |
| Wrenching Facility Type | HEXAGON BOTH ENDS |
| Material | STEEL CORROSION RESISTING CASING |
| Material | STEEL CORROSION RESISTING CORE |
| Casing Outside Diameter | 0.625 INCHES NOMINAL IN |
| Minimum Operating Radius | 14.000 INCHES IN |
| End Type | SQUARE MALE BOTH ENDS |
| Tip Length | 22.250 INCHES NOMINAL BOTH ENDS IN |
| 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 |
| Part Number | Manufacturer |
|---|---|
| SC4139 PRIMARY | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division (USA) |
| Reference | Meaning |
|---|---|
| SC4139 | 5/9 Secondary reference Eaton Motor Site |
| 741677-101 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 1680-00-310-2123 is a Shaft Assembly,flexible, manufactured by Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division, classified under FSC 1680, Miscellaneous Aircraft Accessories and Components. Status: active.
NSN 1680-00-310-2123 has 1 manufacturer part number on file: SC4139 (Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division).
Key specifications for SC4139: FSC Application Data: ACFT CONTROL ASSY; Width Across Flats: 0.930 INCHES NOMINAL BOTH ENDS IN; Cross Section Size and Location: 0.245 INCHES MINIMUM ACROSS FLATS FIRST END IN; Cross Section Size and Location: 0.250 INCHES MAXIMUM ACROSS FLATS SECOND END IN. 27 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 1680-00-310-2123 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.