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Technical Data Sheet
PartsTable / O-RING / M25988/1-347
M25988/1-347 ✓ 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 M25988/1-347 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-125-6269, 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
M25988/1-347
NSN: 5331-01-125-6269
FSC: 5331 — O-RING
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberM25988/1-347
NSN5331-01-125-6269
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M25988/1-347 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: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 4.195 INCHES MINIMUM AND 4.255 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 4.645 INCHES NOMINAL IN
•
MATERIAL: RUBBER FLUOROSILICONE CLASS FQ
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
CENTER HOLE DIAMETER4.195 INCHES MINIMUM AND 4.255 INCHES MAXIMUM IN
OUTSIDE DIAMETER4.645 INCHES NOMINAL IN
MATERIALRUBBER FLUOROSILICONE CLASS FQ
ELONGATION PERCENTAGE125 MAXIMUM
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
1761000Interchangeable
interchangeable cross-reference
interchangeable
145F-4-4Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-25988/1Interchangeable
Same NIIN cross-reference
interchangeable
MIL-R-25988/1Interchangeable
Same NIIN cross-reference
interchangeable
10163404Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M25988/1-347?
M25988/1-347 is a M25988/1-347.
What parts can replace M25988/1-347?
There are 5 known substitutes for M25988/1-347: 1761000, 145F-4-4, MIL-DTL-25988/1 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M25988/1-347?
M25988/1-347 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-125-6269. 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