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Technical Data Sheet
PartsTable / O-RING / MILR25988
MILR25988 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: RUBBER FLUOROSILICONE CLASS FQ, temp_rating: -90.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF, hardness_rating: 75.0 SHORE DUROMETER A NOMINAL, center_hole_diameter: 0.914 INCHES MINIMUM AND 0.934 INCHES MAXIMUM IN, cross-sectional_height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN, end_item_identification: AIRCRAFT, B-2 BOMBER (ATB). 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
MILR25988
NSN: 5331-00-099-7533
FSC: 5331 — O-RING
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER FLUOROSILICONE CLASS FQ
temp_rating-90.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF
hardness_rating75.0 SHORE DUROMETER A NOMINAL
center_hole_diameter0.914 INCHES MINIMUM AND 0.934 INCHES MAXIMUM IN
cross-sectional_height0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
end_item_identificationAIRCRAFT, B-2 BOMBER (ATB)
specification/standard_data81349-MIL-R-25988/2/INACTIVE GOVERNMENT SPECIFICATION
material_document_and_classificationMIL-R-25988 TYPE 1, CLASS 3, GRADE 75 MIL SPEC SINGLE MATERIAL RESPONSE
NSN5331-00-099-7533
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MILR25988 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 33
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 MILR25988?
MILR25988 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace MILR25988?
There are 33 known substitutes for MILR25988: MILR25988ES, PRP111-11646, H733-4-111 and 30 more. Substitute compatibility should be verified for your specific system.
Is MILR25988 still available?
MILR25988 is currently cancelled.
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Last verified: July 2026