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Technical Data Sheet
PartsTable / COMPONENT / FFT791-TY1-FM1-CL4-1/2X6
FFT791-TY1-FM1-CL4-1/2X6 ✓ 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-CL4-1/2X6 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-187-8175, 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-CL4-1/2X6
NSN: 5340-00-187-8175
FSC: 5340
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
Part NumberFFT791-TY1-FM1-CL4-1/2X6
NSN5340-00-187-8175
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: FFT791-TY1-FM1-CL4-1/2X6 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
•
TAKE-UP DISTANCE: 6.000 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) BODY
•
BODY STYLE: ROUND OPEN BODY
•
LENGTH: 12.000 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
NOMINAL THREAD SIZE: 0.500 INCHES BODY IN
•
NONDEFINITIVE SPEC/STD DATA: 4 CLASS AND 1 FORM AND 1 TYPE
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS1A BODY A
TAKE-UP DISTANCE6.000 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) BODY
BODY STYLEROUND OPEN BODY
LENGTH12.000 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.500 INCHES BODY IN
NONDEFINITIVE SPEC/STD DATA4 CLASS AND 1 FORM AND 1 TYPE
SURFACE TREATMENTZINC OVERALL
BODY LENGTH7.500 INCHES NOMINAL 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
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FFT791-TY1-FM1-CL4-1/2X6?
FFT791-TY1-FM1-CL4-1/2X6 is a FFT791-TY1-FM1-CL4-1/2X6.
What parts can replace FFT791-TY1-FM1-CL4-1/2X6?
There are 18 known substitutes for FFT791-TY1-FM1-CL4-1/2X6: ASTM F 1145-5, FF-T-791, 11157-1-64 and 15 more. Substitute compatibility should be verified for your specific system.
Is FFT791-TY1-FM1-CL4-1/2X6 still available?
FFT791-TY1-FM1-CL4-1/2X6 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