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Technical Data Sheet
PartsTable / COMPONENT / A156.4
A156.4 ✓ 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 A156.4 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 5340-00-116-2375, 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
A156.4
NSN: 5340-00-116-2375
FSC: 5340
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberA156.4
NSN5340-00-116-2375
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A156.4 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
•
MOUNTING TYPE FOR WHICH DESIGNED: SURFACE
•
UNIT TYPE: SINGLE ACTION
•
CONTROL TYPE: LIQUID
•
SPECIFICATION/STANDARD DATA: 80205-ANSI-A156-4 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING TYPE FOR WHICH DESIGNEDSURFACE
UNIT TYPESINGLE ACTION
CONTROL TYPELIQUID
SPECIFICATION/STANDARD DATA80205-ANSI-A156-4 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SPECIAL FEATURESTYPE C03012,SIZE III
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
FF-H-121Interchangeable
interchangeable cross-reference
interchangeable
A156.4 TYPE C02012 SIZE 4Interchangeable
interchangeable cross-reference
interchangeable
A-A-1926Interchangeable
interchangeable cross-reference
interchangeable
K740/ALInterchangeable
interchangeable cross-reference
interchangeable
A-A-156-4Interchangeable
interchangeable cross-reference
interchangeable
A156.4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A156.4?
A156.4 is a A156.4.
What parts can replace A156.4?
There are 11 known substitutes for A156.4: FF-H-121, A156.4 TYPE C02012 SIZE 4, A-A-1926 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A156.4?
A156.4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-116-2375. 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