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Technical Data Sheet
PartsTable / O-RING / ARP568-440MILP5 51168
ARP568-440MILP5 51168 ✓ 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 O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, temp_rating: -65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF, hardness_rating: 72.0 SHORE DUROMETER A MINIMUM AND 78.0 SHORE DUROMETER A MAXIMUM, peripheral_diameter: 7.275 INCHES NOMINAL IN, center_hole_diameter: 6.685 INCHES MINIMUM AND 6.765 INCHES MAXIMUM IN, elongation_percentage: 125 MAXIMUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-160-4339, 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
ARP568-440MILP5 51168
NSN: 5331-01-160-4339
FSC: 5331 — O-RING
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
temp_rating-65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
hardness_rating72.0 SHORE DUROMETER A MINIMUM AND 78.0 SHORE DUROMETER A MAXIMUM
peripheral_diameter7.275 INCHES NOMINAL IN
center_hole_diameter6.685 INCHES MINIMUM AND 6.765 INCHES MAXIMUM IN
elongation_percentage125 MAXIMUM
cross-sectional_height0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
NSN5331-01-160-4339
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ARP568-440MILP5 51168 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
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
CENTER HOLE DIAMETER: 6.685 INCHES MINIMUM AND 6.765 INCHES MAXIMUM IN
•
TEMP RATING: -65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
•
PERIPHERAL DIAMETER: 7.275 INCHES NOMINAL IN
•
CROSS-SECTIONAL HEIGHT: 0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
HARDNESS RATING: 72.0 SHORE DUROMETER A MINIMUM AND 78.0 SHORE DUROMETER A MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
ELONGATION PERCENTAGE125 MAXIMUM
CENTER HOLE DIAMETER6.685 INCHES MINIMUM AND 6.765 INCHES MAXIMUM IN
TEMP RATING-65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
PERIPHERAL DIAMETER7.275 INCHES NOMINAL IN
CROSS-SECTIONAL HEIGHT0.269 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
HARDNESS RATING72.0 SHORE DUROMETER A MINIMUM AND 78.0 SHORE DUROMETER A MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
T326AS20WInterchangeable
interchangeable cross-reference
interchangeable
374NMInterchangeable
interchangeable cross-reference
interchangeable
3001-4019-02Interchangeable
interchangeable cross-reference
interchangeable
2991Interchangeable
interchangeable cross-reference
interchangeable
3047Interchangeable
interchangeable cross-reference
interchangeable
8607001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ARP568-440MILP5 51168?
ARP568-440MILP5 51168 is a O-RING.
What parts can replace ARP568-440MILP5 51168?
There are 20 known substitutes for ARP568-440MILP5 51168: T326AS20W, 374NM, 3001-4019-02 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ARP568-440MILP5 51168?
ARP568-440MILP5 51168 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-160-4339. 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