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Technical Data Sheet
PartsTable / COMPONENT / FF-T-791
FF-T-791 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The TURNBUCKLE is a the manufacturer industrial component. Key specifications include length: 18.000 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING OVERALL, end_style: CLEVIS AND CLEVIS, eye_width: 1.000 INCHES MINIMUM IN, nut_style: WING, body_style: ROUND OPEN BODY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-003-6685, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
FF-T-791
NSN: 5306-00-003-6685
FSC: 5306
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
length18.000 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING OVERALL
end_styleCLEVIS AND CLEVIS
eye_width1.000 INCHES MINIMUM IN
nut_styleWING
body_styleROUND OPEN BODY
end_radius0.340 INCHES NOMINAL IN
eye_length0.938 INCHES MINIMUM IN
fork_depth0.720 INCHES NOMINAL IN
fork_width0.750 INCHES MINIMUM IN
hole_shapeROUND
body_length19.875 INCHES MINIMUM IN
NSN5306-00-003-6685
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FF-T-791 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
EYE STOCK DIAMETER: 0.438 INCHES NOMINAL IN
•
EYE WIDTH: 0.719 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 13
•
STYLE DESIGNATOR: OVAL, CLOSED
•
MATERIAL: STEEL OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD DIRECTION: LEFT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
EYE STOCK DIAMETER0.438 INCHES NOMINAL IN
EYE WIDTH0.719 INCHES NOMINAL IN
THREAD QUANTITY PER INCH13
STYLE DESIGNATOROVAL, CLOSED
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD DIRECTIONLEFT-HAND
OVERALL LENGTH6.969 INCHES NOMINAL IN
THREAD LENGTH4.250 INCHES MINIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
ASTM F 1145-5Upgraded Successor
successor cross-reference
successor
FF-T-791Upgraded Successor
successor cross-reference
successor
11157-1-64Upgraded Successor
successor cross-reference
successor
ASTM-F1145-I1B 1/2X9Upgraded Successor
successor cross-reference
successor
S-2510-1/2X9Upgraded Successor
successor cross-reference
successor
MS27954-5Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF-T-791?
FF-T-791 is a TURNBUCKLE.
What parts can replace FF-T-791?
There are 18 known substitutes for FF-T-791: ASTM F 1145-5, FF-T-791, 11157-1-64 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FF-T-791?
FF-T-791 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-003-6685. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026