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Technical Data Sheet
PartsTable / O-RING / 120RCLASS1SIZE0V21
120RCLASS1SIZE0V21 ✓ 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, cross-sectional_height: 0.125 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-579-6349, 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
120RCLASS1SIZE0V21
NSN: 5331-00-579-6349
FSC: 5331 — O-RING
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
cross-sectional_height0.125 INCHES NOMINAL IN
NSN5331-00-579-6349
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 120RCLASS1SIZE0V21 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
•
MATERIAL: RUBBER SYNTHETIC
•
CROSS-SECTIONAL HEIGHT: 0.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER SYNTHETIC
CROSS-SECTIONAL HEIGHT0.125 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
5376Interchangeable
interchangeable cross-reference
interchangeable
SMP20-304Interchangeable
interchangeable cross-reference
interchangeable
825-102Interchangeable
interchangeable cross-reference
interchangeable
76EInterchangeable
interchangeable cross-reference
interchangeable
87-8-6-70Interchangeable
interchangeable cross-reference
interchangeable
38-5376-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 120RCLASS1SIZE0V21?
120RCLASS1SIZE0V21 is a O-RING.
What parts can replace 120RCLASS1SIZE0V21?
There are 20 known substitutes for 120RCLASS1SIZE0V21: 5376, SMP20-304, 825-102 and 17 more. Substitute compatibility should be verified for your specific system.
Is 120RCLASS1SIZE0V21 still available?
120RCLASS1SIZE0V21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026