PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FFT791-TY1-FM1-CL4-5/16X4 1/2Turnbuckle

Federal Specifications Promulgated by General Services Administration Washington DC · NSN 5340-00-187-8185 · FSC 5340 · No Item Name Available
Verified by PartsTable
NSN 5340-00-187-8185 — this item is cataloged by the U.S. Government under National Stock Number 5340-00-187-8185. Primary manufacturer part number: FFT791-TY1-FM1-CL4-5/16X4 1/2.
Features
  • Turnbuckle — FSC 5340
  • Thread Class: 1A BODY A
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) BODY
  • Take-Up Distance: 4.500 INCHES NOMINAL IN
  • Body Length: 5.438 INCHES NOMINAL IN
  • Locking Device Type: NUT
  • Surface Treatment: ZINC OVERALL
  • End Style: CLOSED EYE AND CLOSED EYE
Applications
  • Applications requiring Steel Overall construction
General Description

The Turnbuckle, cataloged under National Stock Number 5340-00-187-8185, is classified within Federal Supply Class 5340 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5340-00-187-8185
Primary Part NumberFFT791-TY1-FM1-CL4-5/16X4 1/2
Item NameTurnbuckle
FSC / FSG5340 / 53 — No Item Name Available
ManufacturerFederal Specifications Promulgated by General Services Administration Washington DC
StatusACTIVE
Thread Class1A BODY A
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC) BODY
Take-Up Distance4.500 INCHES NOMINAL IN
Body Length5.438 INCHES NOMINAL IN
Locking Device TypeNUT
Surface TreatmentZINC OVERALL
End StyleCLOSED EYE AND CLOSED EYE
Length8.500 INCHES NOMINAL IN
Nominal Thread Size0.312 INCHES BODY IN
MaterialSTEEL OVERALL
Nondefinitive Spec/std Data4 CLASS AND 1 FORM AND 1 TYPE
Eye Width0.438 INCHES NOMINAL IN
Body StyleROUND OPEN BODY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Unit of IssueEA
Verified Substitutes 12
5340-00-187-8186ASTM F 1145-5 SUCCESSOR
Turnbuckle
Astm Institute for Standards Research (inc)
5340-00-150-4777ASTM-F1145-I1B 1/2X9 SUCCESSOR
Turnbuckle
American Society for Testing and Materials Dba Astm International
5340-00-168-6315MS27120-10 SUCCESSOR
Clevis,rod End
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5340-00-179-9249MS27120-5 SUCCESSOR
Clevis,rod End
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5340-00-179-9250MS27954-3 SUCCESSOR
Turnbuckle Body
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5340-00-184-2783MS27120-8 SUCCESSOR
Clevis,rod End
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5340-00-187-8174ASTM-F1145-I1D 3/8X6 SUCCESSOR
Turnbuckle
American Society for Testing and Materials Dba Astm International
5340-00-187-8176ASTM-F1145-I1D 1/2X9 SUCCESSOR
Turnbuckle
American Society for Testing and Materials Dba Astm International
5340-00-187-8179ASTM-F1145-I1D 5/8X9 SUCCESSOR
Turnbuckle
American Society for Testing and Materials Dba Astm International
5340-00-187-8180ASTM-F1145-I1D 5/8X12 SUCCESSOR
Turnbuckle
American Society for Testing and Materials Dba Astm International
Cross-Reference Index
Part NumberManufacturer
FFT791-TY1-FM1-CL4-5/16X4 1/2 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
FF-T-791 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
5340-00-187-8186SUCCESSOR
TURNBUCKLE
ASTM F 1145-5
5340-00-150-4777SUCCESSOR
TURNBUCKLE
ASTM-F1145-I1B 1/2X9
5340-00-168-6315SUCCESSOR
CLEVIS,ROD END
MS27120-10
5340-00-179-9249SUCCESSOR
CLEVIS,ROD END
MS27120-5
5340-00-179-9250SUCCESSOR
TURNBUCKLE BODY
MS27954-3
5340-00-184-2783SUCCESSOR
CLEVIS,ROD END
MS27120-8
5340-00-187-8174SUCCESSOR
TURNBUCKLE
ASTM-F1145-I1D 3/8X6
5340-00-187-8176SUCCESSOR
TURNBUCKLE
ASTM-F1145-I1D 1/2X9
5340-00-187-8179SUCCESSOR
TURNBUCKLE
ASTM-F1145-I1D 5/8X9
5340-00-187-8180SUCCESSOR
TURNBUCKLE
ASTM-F1145-I1D 5/8X12
5340-00-187-8184SUCCESSOR
TURNBUCKLE
ASTM-F1145-I1D 1/4X4
5340-00-187-8192SUCCESSOR
TURNBUCKLE
ASTM-F1145-I1D 1X12

Frequently Asked Questions

What is NSN 5340-00-187-8185?

NSN 5340-00-187-8185 is a Turnbuckle, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 5340 (No Item Name Available). Status: active.

What are the part numbers for NSN 5340-00-187-8185?

NSN 5340-00-187-8185 has 2 cross-referenced part numbers: FFT791-TY1-FM1-CL4-5/16X4 1/2 (Federal Specifications Promulgated by General Services Administration Washington DC), FF-T-791 (Federal Specifications Promulgated by General Services Administration Washington DC).

What NSN replaces 5340-00-187-8185?

There are 12 known substitutes for 5340-00-187-8185: 5340-00-187-8186, 5340-00-150-4777, 5340-00-168-6315 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FFT791-TY1-FM1-CL4-5/16X4 1/2?

Key specifications for FFT791-TY1-FM1-CL4-5/16X4 1/2: Thread Class: 1A BODY A; Thread Series Designator: UNIFIED NATIONAL COARSE (UNC) BODY; Take-Up Distance: 4.500 INCHES NOMINAL IN; Body Length: 5.438 INCHES NOMINAL IN. 13 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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