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Technical Data Sheet
PartsTable / O-RING / M25988/4-111
M25988/4-111 ✓ 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 M25988/4-111 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-200-6287, 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
M25988/4-111
NSN: 5331-01-200-6287
FSC: 5331 — O-RING
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM25988/4-111
NSN5331-01-200-6287
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M25988/4-111 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
•
HARDNESS RATING: 80.0 SHORE DUROMETER A NOMINAL
•
MATERIAL: RUBBER FLUOROSILICONE CLASS FQ
•
CENTER HOLE DIAMETER: 0.419 INCHES MINIMUM AND 0.429 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.619 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN
•
CROSS-SECTIONAL HEIGHT: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
TEMP RATING: -90.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING80.0 SHORE DUROMETER A NOMINAL
MATERIALRUBBER FLUOROSILICONE CLASS FQ
CENTER HOLE DIAMETER0.419 INCHES MINIMUM AND 0.429 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.619 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN
CROSS-SECTIONAL HEIGHT0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
ELONGATION PERCENTAGE125 MAXIMUM
TEMP RATING-90.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
182567Interchangeable
interchangeable cross-reference
interchangeable
2-111LB06-80Interchangeable
interchangeable cross-reference
interchangeable
170-105Interchangeable
interchangeable cross-reference
interchangeable
L1218 2-111Interchangeable
Same NIIN cross-reference
interchangeable
111-11648Interchangeable
Same NIIN cross-reference
interchangeable
2-111L1218-80Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M25988/4-111?
M25988/4-111 is a M25988/4-111.
What parts can replace M25988/4-111?
There are 11 known substitutes for M25988/4-111: 182567, 2-111LB06-80, 170-105 and 8 more. Substitute compatibility should be verified for your specific system.
Is M25988/4-111 still available?
M25988/4-111 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