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EAB557 ✓ 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 SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: STEEL CASE, case_style: SQUARE, seal_width: 0.125 INCHES NOMINAL IN, outside_diameter: 0.754 INCHES NOMINAL IN, surface_treatment: PLASTIC CASE, housing_bore_diameter: 0.750 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-558-0271, 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
EAB557
NSN: 5330-00-558-0271
FSC: 5330
CAGE: 81996 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL CASE
case_styleSQUARE
seal_width0.125 INCHES NOMINAL IN
outside_diameter0.754 INCHES NOMINAL IN
surface_treatmentPLASTIC CASE
housing_bore_diameter0.750 INCHES NOMINAL IN
sealing_element_styleANGULAR
maximum_pressure_rating7.0 POUNDS PER SQUARE INCH (PSI) LBS
accommodated_shaft_diameter0.500 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed1000 FEET PER MINUTE FT
NSN5330-00-558-0271
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: EAB557 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
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 1000 FEET PER MINUTE FT
•
SEALING ELEMENT STYLE: ANGULAR
•
SURFACE TREATMENT: PLASTIC CASE
•
MAXIMUM PRESSURE RATING: 7.0 POUNDS PER SQUARE INCH (PSI) LBS
•
MATERIAL: STEEL CASE
•
CASE STYLE: SQUARE
•
ACCOMMODATED SHAFT DIAMETER: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT MAXIMUM RATED SPEED1000 FEET PER MINUTE FT
SEALING ELEMENT STYLEANGULAR
SURFACE TREATMENTPLASTIC CASE
MAXIMUM PRESSURE RATING7.0 POUNDS PER SQUARE INCH (PSI) LBS
MATERIALSTEEL CASE
CASE STYLESQUARE
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER0.500 INCHES NOMINAL IN
SEAL WIDTH0.125 INCHES NOMINAL IN
HOUSING BORE DIAMETER0.750 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
TC12Interchangeable
interchangeable cross-reference
interchangeable
FC012Interchangeable
interchangeable cross-reference
interchangeable
B107.21 TY2CL2Interchangeable
interchangeable cross-reference
interchangeable
208812Interchangeable
interchangeable cross-reference
interchangeable
4912Interchangeable
interchangeable cross-reference
interchangeable
BMK506-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is EAB557?
EAB557 is a SEAL,PLAIN ENCASED.
What parts can replace EAB557?
There are 19 known substitutes for EAB557: TC12, FC012, B107.21 TY2CL2 and 16 more. Substitute compatibility should be verified for your specific system.
Is EAB557 still available?
EAB557 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