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Technical Data Sheet
PartsTable / COMPONENT / B55557
B55557 ✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

The CONDUIT,METAL,FLEXIBLE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 440A OR STEEL COMP 440B OR STEEL COMP 440C OVERALL A, special_features: METALLIC HARDNESS RATING ROCKWELL C MIN 58.0 IN. AND MAX 65.0 IN.

IN, style_designator: BALL, rolling_element_diameter: 0.3125 INCHES NOMINAL IN, standard_tolerance_designation: AFBMA STD TOLERANCE FOR BALLS, GRADE 25, material_document_and_classification: AISI ASSN STD ALL MATERIAL RESPONSES OVERALL. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-555-6574, 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
B55557
NSN: 3110-00-555-6574
FSC: 3110
CAGE: 88907 — BRUNSWICK CORP DBA MERCURY MARINE DIV MERCURY MARINE (USA)
SPECIFICATIONS
materialSTEEL COMP 440A OR STEEL COMP 440B OR STEEL COMP 440C OVERALL A
special_featuresMETALLIC HARDNESS RATING ROCKWELL C MIN 58.0 IN. AND MAX 65.0 IN. IN
style_designatorBALL
rolling_element_diameter0.3125 INCHES NOMINAL IN
standard_tolerance_designationAFBMA STD TOLERANCE FOR BALLS, GRADE 25
material_document_and_classificationAISI ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN3110-00-555-6574
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: B55557 · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
ROLLING ELEMENT DIAMETER: 0.3125 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD ALL MATERIAL RESPONSES OVERALL
•
MATERIAL: STEEL COMP 440A OR STEEL COMP 440B OR STEEL COMP 440C OVERALL A
•
STYLE DESIGNATOR: BALL
•
STANDARD TOLERANCE DESIGNATION: AFBMA STD TOLERANCE FOR BALLS, GRADE 25
TECHNICAL CHARACTERISTICS (FLIS)
ROLLING ELEMENT DIAMETER0.3125 INCHES NOMINAL IN
SPECIAL FEATURESMETALLIC HARDNESS RATING ROCKWELL C MIN 58.0 IN. AND MAX 65.0 IN. IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD ALL MATERIAL RESPONSES OVERALL
MATERIALSTEEL COMP 440A OR STEEL COMP 440B OR STEEL COMP 440C OVERALL A
STYLE DESIGNATORBALL
STANDARD TOLERANCE DESIGNATIONAFBMA STD TOLERANCE FOR BALLS, GRADE 25
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
945827Interchangeable
interchangeable cross-reference
interchangeable
25501-5SInterchangeable
interchangeable cross-reference
interchangeable
7017Interchangeable
interchangeable cross-reference
interchangeable
45363-2Interchangeable
interchangeable cross-reference
interchangeable
BC1-0625Interchangeable
interchangeable cross-reference
interchangeable
C62-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B55557?
B55557 is a CONDUIT,METAL,FLEXIBLE.
What parts can replace B55557?
There are 10 known substitutes for B55557: 945827, 25501-5S, 7017 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B55557?
B55557 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-555-6574. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026