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Technical Data Sheet
PartsTable / COMPONENT / FFT791-TY1-FM1-CL4-1/2X17 1/2
FFT791-TY1-FM1-CL4-1/2X17 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-CL4-1/2X17 1/2 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-187-8177, 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-CL4-1/2X17 1/2
NSN: 5340-00-187-8177
FSC: 5340
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
Part NumberFFT791-TY1-FM1-CL4-1/2X17 1/2
NSN5340-00-187-8177
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: FFT791-TY1-FM1-CL4-1/2X17 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
•
BODY LENGTH: 13.500 INCHES NOMINAL IN
•
THREAD CLASS: 1A BODY A
•
NONDEFINITIVE SPEC/STD DATA: 4 CLASS AND 1 FORM AND 1 TYPE
•
LOCKING DEVICE TYPE: NUT
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) BODY
•
NOMINAL THREAD SIZE: 0.500 INCHES BODY IN
•
TAKE-UP DISTANCE: 17.500 INCHES NOMINAL IN
•
BODY STYLE: ROUND OPEN BODY
TECHNICAL CHARACTERISTICS (FLIS)
BODY LENGTH13.500 INCHES NOMINAL IN
THREAD CLASS1A BODY A
NONDEFINITIVE SPEC/STD DATA4 CLASS AND 1 FORM AND 1 TYPE
LOCKING DEVICE TYPENUT
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) BODY
NOMINAL THREAD SIZE0.500 INCHES BODY IN
TAKE-UP DISTANCE17.500 INCHES NOMINAL IN
BODY STYLEROUND OPEN BODY
LENGTH21.512 INCHES NOMINAL IN
END STYLECLOSED EYE AND CLOSED EYE
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
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFT791-TY1-FM1-CL4-1/2X17 1/2?
FFT791-TY1-FM1-CL4-1/2X17 1/2 is a FFT791-TY1-FM1-CL4-1/2X17 1/2.
What parts can replace FFT791-TY1-FM1-CL4-1/2X17 1/2?
There are 17 known substitutes for FFT791-TY1-FM1-CL4-1/2X17 1/2: ASTM F 1145-5, FF-T-791, 11157-1-64 and 14 more. Substitute compatibility should be verified for your specific system.
Is FFT791-TY1-FM1-CL4-1/2X17 1/2 still available?
FFT791-TY1-FM1-CL4-1/2X17 1/2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026