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AN123988 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

AN123988: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, hardness_rating: 70.0 SHORE DUROMETER A NOMINAL, outside_diameter: 2.512 INCHES NOMINAL IN, center_hole_diameter: 2.224 INCHES MINIMUM AND 2.244 INCHES MAXIMUM IN, cross-sectional_height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-285-9770, 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
AN123988
NSN: 5331-00-285-9770
FSC: 5331 — O-ring
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
hardness_rating70.0 SHORE DUROMETER A NOMINAL
outside_diameter2.512 INCHES NOMINAL IN
center_hole_diameter2.224 INCHES MINIMUM AND 2.244 INCHES MAXIMUM IN
cross-sectional_height0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
NSN5331-00-285-9770
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AN123988 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
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 2.512 INCHES NOMINAL IN
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
•
CENTER HOLE DIAMETER: 2.224 INCHES MINIMUM AND 2.244 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
OUTSIDE DIAMETER2.512 INCHES NOMINAL IN
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
CENTER HOLE DIAMETER2.224 INCHES MINIMUM AND 2.244 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
SUBSTITUTES & CROSS-REFERENCES 2
AS3569-228Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS3569Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Shelf-life managedAcquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AN123988?
AN123988 is a O-RING.
What parts can replace AN123988?
There are 2 known substitutes for AN123988: AS3569-228, SAE-AS3569. Substitute compatibility should be verified for your specific system.
What is the NSN for AN123988?
AN123988 is cataloged in the U.S. Government catalog under NSN 5331-00-285-9770. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.