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Technical Data Sheet
PartsTable / COMPONENT / 663557R91
663557R91 ✓ 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

DRAWER,STANDARDIZED COMPONENTS C. Key specifications include material: STEEL OVERALL, cone_width: 0.7800 INCHES NOMINAL IN, bore_diameter: 1.6250 INCHES NOMINAL IN, special_features: DUTY CLASS LM SERIES, style_designator: NORMAL ANGLE, cone_corner_radius: 0.1400 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-727-6901, 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
663557R91
NSN: 3110-00-727-6901
FSC: 3110
CAGE: 23926 — KOMATSU AMERICA CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cone_width0.7800 INCHES NOMINAL IN
bore_diameter1.6250 INCHES NOMINAL IN
special_featuresDUTY CLASS LM SERIES
style_designatorNORMAL ANGLE
cone_corner_radius0.1400 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-727-6901
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 663557R91 · 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
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
CONE CORNER RADIUS: 0.1400 INCHES NOMINAL IN
•
CONE WIDTH: 0.7800 INCHES NOMINAL IN
•
BORE DIAMETER: 1.6250 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: NORMAL ANGLE
TECHNICAL CHARACTERISTICS (FLIS)
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
CONE CORNER RADIUS0.1400 INCHES NOMINAL IN
CONE WIDTH0.7800 INCHES NOMINAL IN
SPECIAL FEATURESDUTY CLASS LM SERIES
BORE DIAMETER1.6250 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
STYLE DESIGNATORNORMAL ANGLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
B-61116Interchangeable
interchangeable cross-reference
interchangeable
61116Interchangeable
interchangeable cross-reference
interchangeable
40318Interchangeable
interchangeable cross-reference
interchangeable
357109Interchangeable
interchangeable cross-reference
interchangeable
11635963Interchangeable
interchangeable cross-reference
interchangeable
2132746-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 663557R91?
663557R91 is a DRAWER,STANDARDIZED COMPONENTS C.
What parts can replace 663557R91?
There are 28 known substitutes for 663557R91: B-61116, 61116, 40318 and 25 more. Substitute compatibility should be verified for your specific system.
Is 663557R91 still available?
663557R91 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