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Technical Data Sheet
PartsTable / O-RING / M25988/1-139
M25988/1-139 ✓ 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 M25988/1-139 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-099-7533, 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
M25988/1-139
NSN: 5331-00-099-7533
FSC: 5331 — O-RING
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
Part NumberM25988/1-139
NSN5331-00-099-7533
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: M25988/1-139 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
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
CENTER HOLE DIAMETER: 2.158 INCHES MINIMUM AND 2.192 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 2.381 INCHES NOMINAL IN
•
CROSS-SECTIONAL HEIGHT: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
•
MATERIAL: RUBBER FLUOROSILICONE CLASS FQ
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
TECHNICAL CHARACTERISTICS (FLIS)
ELONGATION PERCENTAGE125 MAXIMUM
CENTER HOLE DIAMETER2.158 INCHES MINIMUM AND 2.192 INCHES MAXIMUM IN
OUTSIDE DIAMETER2.381 INCHES NOMINAL IN
CROSS-SECTIONAL HEIGHT0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
MATERIALRUBBER FLUOROSILICONE CLASS FQ
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
MILR25988ESInterchangeable
interchangeable cross-reference
interchangeable
PRP111-11646Interchangeable
interchangeable cross-reference
interchangeable
H733-4-111Interchangeable
interchangeable cross-reference
interchangeable
M25988/1-025Interchangeable
interchangeable cross-reference
interchangeable
10163359Interchangeable
interchangeable cross-reference
interchangeable
754-4-37002-025Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M25988/1-139?
M25988/1-139 is a M25988/1-139.
What parts can replace M25988/1-139?
There are 32 known substitutes for M25988/1-139: MILR25988ES, PRP111-11646, H733-4-111 and 29 more. Substitute compatibility should be verified for your specific system.
Is M25988/1-139 still available?
M25988/1-139 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