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Technical Data Sheet
PartsTable / O-RING / AS568B-221
AS568B-221 ✓ 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 SYNTHETIC, outside_diameter: 1.699 INCHES NOMINAL IN, center_hole_diameter: 1.409 INCHES MINIMUM AND 1.433 INCHES MAXIMUM IN, cross-sectional_height: 0.125 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-623-1119, 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
AS568B-221
NSN: 5331-00-623-1119
FSC: 5331 — O-RING
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
outside_diameter1.699 INCHES NOMINAL IN
center_hole_diameter1.409 INCHES MINIMUM AND 1.433 INCHES MAXIMUM IN
cross-sectional_height0.125 INCHES NOMINAL IN
NSN5331-00-623-1119
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AS568B-221 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
•
CENTER HOLE DIAMETER: 1.415 INCHES MINIMUM AND 1.427 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.699 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYHEXAMETHYLENE ADIPAMIDE
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER1.415 INCHES MINIMUM AND 1.427 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.699 INCHES NOMINAL IN
MATERIALPLASTIC POLYHEXAMETHYLENE ADIPAMIDE
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
MS28775-221Interchangeable
interchangeable cross-reference
interchangeable
230079111Interchangeable
interchangeable cross-reference
interchangeable
AN6227-26Interchangeable
interchangeable cross-reference
interchangeable
7400-90-232Interchangeable
interchangeable cross-reference
interchangeable
76NC232Interchangeable
interchangeable cross-reference
interchangeable
AS568-232Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS568B-221?
AS568B-221 is a O-RING.
What parts can replace AS568B-221?
There are 24 known substitutes for AS568B-221: MS28775-221, 230079111, AN6227-26 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS568B-221?
AS568B-221 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-623-1119. 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