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Technical Data Sheet
PartsTable / O-RING / 53A68C99-4
53A68C99-4 ✓ 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 O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER SILICONE CLASS Q, center_hole_diameter: 0.841 INCHES MINIMUM AND 0.853 INCHES MAXIMUM IN, cross-sectional_height: 0.147 INCHES MINIMUM AND 0.155 INCHES MAXIMUM 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 5331-00-526-7677, 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
53A68C99-4
NSN: 5331-00-526-7677
FSC: 5331 — O-RING
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialRUBBER SILICONE CLASS Q
center_hole_diameter0.841 INCHES MINIMUM AND 0.853 INCHES MAXIMUM IN
cross-sectional_height0.147 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
NSN5331-00-526-7677
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 53A68C99-4 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
•
CROSS-SECTIONAL HEIGHT: 0.147 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 0.841 INCHES MINIMUM AND 0.853 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SILICONE CLASS Q
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.147 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
CENTER HOLE DIAMETER0.841 INCHES MINIMUM AND 0.853 INCHES MAXIMUM IN
MATERIALRUBBER SILICONE CLASS Q
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
240-1095-00Interchangeable
interchangeable cross-reference
interchangeable
18-305Interchangeable
interchangeable cross-reference
interchangeable
LA-1138Interchangeable
interchangeable cross-reference
interchangeable
A18Interchangeable
interchangeable cross-reference
interchangeable
R18CO 5Interchangeable
interchangeable cross-reference
interchangeable
NAS907Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 53A68C99-4?
53A68C99-4 is a O-RING.
What parts can replace 53A68C99-4?
There are 8 known substitutes for 53A68C99-4: 240-1095-00, 18-305, LA-1138 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 53A68C99-4?
53A68C99-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-526-7677. 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