PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

51566Shaft Assembly,flexible

Fwd Seagrave Holdings Lp · NSN 6680-00-352-6597 · FSC 6680 · No Item Name Available
Verified by PartsTable
NSN 6680-00-352-6597 — this item is cataloged by the U.S. Government under National Stock Number 6680-00-352-6597. Primary manufacturer part number: 51566.
Features
  • Shaft Assembly,flexible — FSC 6680
  • Screw Thread Series Designator: UNEF SECOND END
  • Thread Length: 0.375 INCHES NOMINAL SECOND END IN
  • Shank Outside Diameter: 0.500 INCHES NOMINAL FIRST END IN
  • Casing Outside Diameter: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
  • End Overall Diameter: 0.875 INCHES NOMINAL SECOND END IN
  • Coating Method: PLATED CORE
  • Thread Depth: 0.266 INCHES NOMINAL FIRST END IN
Applications
  • Applications requiring Steel Casing construction
General Description

The Shaft Assembly,flexible, cataloged under National Stock Number 6680-00-352-6597, is classified within Federal Supply Class 6680 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Fwd Seagrave Holdings Lp. Government technical data includes 28 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6680-00-352-6597
Primary Part Number51566
Item NameShaft Assembly,flexible
FSC / FSG6680 / 66 — No Item Name Available
ManufacturerFwd Seagrave Holdings Lp
StatusACTIVE
Screw Thread Series DesignatorUNEF SECOND END
Thread Length0.375 INCHES NOMINAL SECOND END IN
Shank Outside Diameter0.500 INCHES NOMINAL FIRST END IN
Casing Outside Diameter0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
End Overall Diameter0.875 INCHES NOMINAL SECOND END IN
Coating MethodPLATED CORE
Thread Depth0.266 INCHES NOMINAL FIRST END IN
Tip Length0.875 INCHES MINIMUM AND 1.125 INCHES MAXIMUM FIRST END IN
Thread Class2B FIRST END
Thread Class2A SECOND END A
Shoulder Outside Diameter0.563 INCHES NOMINAL SECOND END IN
End Connection TypeUNION FERRULE FIRST END
Screw Thread Series DesignatorUNS FIRST END
End TypeROUND KEYED FIRST END
Thread LocationINTERNAL FIRST END
Core Diameter0.150 INCHES NOMINAL IN
Surface TreatmentCOPPER AND TIN CORE
End TypeSQUARE MALE SECOND END
Surface TreatmentZINC CASING
Thread LocationEXTERNAL SECOND END
Tip Length0.125 INCHES NOMINAL SECOND END IN
MaterialSTEEL CASING
Core RemovabilityREMOVABLE
Minimum Operating Radius3.000 INCHES IN
FSC Application DataSPEEDOMETER GROUP,TRUCK CHASSIS
Shoulder Outside Diameter0.800 INCHES NOMINAL FIRST END IN
Thread DirectionRIGHT-HAND BOTH ENDS
Cross Section Size and Location0.100 INCHES MINIMUM DIAMETER AND 0.108 INCHES MAXIMUM DIAMETER SECOND END IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5310-00-275-070311A2089 INTERCHANGEABLE
Nut,plain,octagon
Napco International Llc Dba Napco International Inc
5340-00-969-6407MS35812-1 INTERCHANGEABLE
Clevis,rod End
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5930-01-103-7495 INTERCHANGEABLE
Switch
4330-01-274-845851566 INTERCHANGEABLE
Filter Element,fluid
Wix Corp
3040-01-569-657451566 INTERCHANGEABLE
Shaft Assembly,flexible
Jtekt Column Systems North America Corporation Div Jtekt Column Systems North Amercia
Cross-Reference Index
Part NumberManufacturer
51566 PRIMARY Fwd Seagrave Holdings Lp (USA)
65600-192 Stewart-Warner Corporation (USA)
70550-192 Stewart-Warner Corporation (USA)
446900-2H-192 Stewart-Warner Corporation (USA)
Related Parts
5310-00-275-0703INTERCHANGEABLE
NUT,PLAIN,OCTAGON
11A2089
5340-00-969-6407INTERCHANGEABLE
CLEVIS,ROD END
MS35812-1
5930-01-103-7495INTERCHANGEABLE
SWITCH
4330-01-274-8458INTERCHANGEABLE
FILTER ELEMENT,FLUID
51566
3040-01-569-6574INTERCHANGEABLE
SHAFT ASSEMBLY,FLEXIBLE
51566

Frequently Asked Questions

What is NSN 6680-00-352-6597?

NSN 6680-00-352-6597 is a Shaft Assembly,flexible, manufactured by Fwd Seagrave Holdings Lp, classified under FSC 6680 (No Item Name Available). Status: active.

What are the part numbers for NSN 6680-00-352-6597?

NSN 6680-00-352-6597 has 4 cross-referenced part numbers: 51566 (Fwd Seagrave Holdings Lp), 65600-192 (Stewart-Warner Corporation), 70550-192 (Stewart-Warner Corporation), 446900-2H-192 (Stewart-Warner Corporation).

What NSN replaces 6680-00-352-6597?

There are 5 known substitutes for 6680-00-352-6597: 5310-00-275-0703, 5340-00-969-6407, 5930-01-103-7495 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 51566?

Key specifications for 51566: Screw Thread Series Designator: UNEF SECOND END; Thread Length: 0.375 INCHES NOMINAL SECOND END IN; Overall Length: 192.875 INCHES MINIMUM AND 193.250 INCHES MAXIMUM IN; Shank Outside Diameter: 0.500 INCHES NOMINAL FIRST END IN. 30 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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