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PartsTable / O-RING / A48557MRF
A48557MRF ✓ 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 O-RING is a the manufacturer industrial component. Key specifications include color: BLACK, material: RUBBER FLUOROCARBON CLASS FPM, temp_rating: -15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF, hardness_rating: 75.0 SHORE DUROMETER A NOMINAL, outside_diameter: 1.171 INCHES MINIMUM AND 1.197 INCHES MAXIMUM IN, special_features: FLIGHT SAFETY CRITICAL AIRCRAFT PART. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-166-1020, 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
A48557MRF
NSN: 5331-00-166-1020
FSC: 5331 — O-RING
CAGE: 34889 — HUNT VALVE COMPANY INC DBA UNION FLONETICS (USA)
SPECIFICATIONS
colorBLACK
materialRUBBER FLUOROCARBON CLASS FPM
temp_rating-15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
hardness_rating75.0 SHORE DUROMETER A NOMINAL
outside_diameter1.171 INCHES MINIMUM AND 1.197 INCHES MAXIMUM IN
special_featuresFLIGHT SAFETY CRITICAL AIRCRAFT PART
center_hole_diameter1.104 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN
cross-sectional_height0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
material_document_and_classificationMIL-R-83248 TYPE I, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
part_name_assigned_by_controlling_agencyPACKING,PREFORMED-"O"RING, MIL-R-83248, 75 DUROMETER
NSN5331-00-166-1020
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A48557MRF 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-83248 TYPE I, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
•
HARDNESS RATING: 75.0 SHORE DUROMETER A NOMINAL
•
COLOR: BLACK
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
•
OUTSIDE DIAMETER: 1.171 INCHES MINIMUM AND 1.197 INCHES MAXIMUM IN
•
TEMP RATING: -15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESFLIGHT SAFETY CRITICAL AIRCRAFT PART
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-83248 TYPE I, CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE
HARDNESS RATING75.0 SHORE DUROMETER A NOMINAL
COLORBLACK
MATERIALRUBBER FLUOROCARBON CLASS FPM
OUTSIDE DIAMETER1.171 INCHES MINIMUM AND 1.197 INCHES MAXIMUM IN
TEMP RATING-15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.104 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYPACKING,PREFORMED-"O"RING, MIL-R-83248, 75 DUROMETER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
2-240 V884-75Interchangeable
interchangeable cross-reference
interchangeable
PRP568-240-9009-75Interchangeable
interchangeable cross-reference
interchangeable
S9026L240Interchangeable
interchangeable cross-reference
interchangeable
44YY23689-1-12NInterchangeable
interchangeable cross-reference
interchangeable
10163862Interchangeable
interchangeable cross-reference
interchangeable
AN103810Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A48557MRF?
A48557MRF is a O-RING.
What parts can replace A48557MRF?
There are 25 known substitutes for A48557MRF: 2-240 V884-75, PRP568-240-9009-75, S9026L240 and 22 more. Substitute compatibility should be verified for your specific system.
Is A48557MRF still available?
A48557MRF 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