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Technical Data Sheet
PartsTable / O-RING / MIL-R-25988/1
MIL-R-25988/1 ✓ 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 MIL-R-25988/1 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-279-4329, 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
MIL-R-25988/1
NSN: 5331-00-279-4329
FSC: 5331 — O-RING
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberMIL-R-25988/1
NSN5331-00-279-4329
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-R-25988/1 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
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
•
MATERIAL: RUBBER FLUOROSILICONE CLASS FQ
•
OUTSIDE DIAMETER: 2.387 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 2.091 INCHES MINIMUM AND 2.127 INCHES MAXIMUM IN
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
ELONGATION PERCENTAGE125 MAXIMUM
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
MATERIALRUBBER FLUOROSILICONE CLASS FQ
OUTSIDE DIAMETER2.387 INCHES NOMINAL IN
CENTER HOLE DIAMETER2.091 INCHES MINIMUM AND 2.127 INCHES MAXIMUM IN
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
MILR25988Interchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-25988/1Interchangeable
Same NIIN cross-reference
interchangeable
M25988/1-227Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-R-25988/1?
MIL-R-25988/1 is a MIL-R-25988/1.
What parts can replace MIL-R-25988/1?
There are 3 known substitutes for MIL-R-25988/1: MILR25988, MIL-DTL-25988/1, M25988/1-227. Substitute compatibility should be verified for your specific system.
Is MIL-R-25988/1 still available?
MIL-R-25988/1 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026