PartsTable
Technical Data Sheet
PartsTable / COMPONENT / FFT791-TY1-FM1-CL4-5/16X4 1/2
FFT791-TY1-FM1-CL4-5/16X4 1/2 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The FFT791-TY1-FM1-CL4-5/16X4 1/2 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-187-8185, 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
FFT791-TY1-FM1-CL4-5/16X4 1/2
NSN: 5340-00-187-8185
FSC: 5340
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
Part NumberFFT791-TY1-FM1-CL4-5/16X4 1/2
NSN5340-00-187-8185
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: FFT791-TY1-FM1-CL4-5/16X4 1/2 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
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
•
LENGTH: 8.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
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
Ready to buy FFT791-TY1-FM1-CL4-5/16X4 1/2?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is FFT791-TY1-FM1-CL4-5/16X4 1/2?
FFT791-TY1-FM1-CL4-5/16X4 1/2 is a FFT791-TY1-FM1-CL4-5/16X4 1/2.
What parts can replace FFT791-TY1-FM1-CL4-5/16X4 1/2?
There are 17 known substitutes for FFT791-TY1-FM1-CL4-5/16X4 1/2: ASTM F 1145-5, FF-T-791, 11157-1-64 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FFT791-TY1-FM1-CL4-5/16X4 1/2?
FFT791-TY1-FM1-CL4-5/16X4 1/2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-187-8185. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — FFT791-TY1-FM1-CL4-5/16X4 1/2

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026