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Technical Data Sheet
PartsTable / COMPONENT / 138R
138R ✓ 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 BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: PLASTIC PHENOLIC RETAINER, bore_shape: STRAIGHT, bore_diameter: 190.0 MILLIMETERS NOMINAL MM, overall_width: 46.0 MILLIMETERS NOMINAL MM, load_direction: RADIAL, surface_finish: GROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-5298, 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
138R
NSN: 3110-00-156-5298
FSC: 3110
CAGE: 80038 — EQUITABLE BEARING CO INC (USA)
SPECIFICATIONS
materialPLASTIC PHENOLIC RETAINER
bore_shapeSTRAIGHT
bore_diameter190.0 MILLIMETERS NOMINAL MM
overall_width46.0 MILLIMETERS NOMINAL MM
load_directionRADIAL
surface_finishGROUND
style_designatorCOUNTERBORED OUTER RING, NON-SEPARABLE
overall_outside_diameter300.0 MILLIMETERS NOMINAL MM
internal_fit-up_designationSTANDARD
retainer_fabrication_methodMACHINED
standard_tolerance_designationABEC NO.1
NSN3110-00-156-5298
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 138R · 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
•
STYLE DESIGNATOR: COUNTERBORED OUTER RING, NON-SEPARABLE
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
MATERIAL: STEEL INNER RING
•
INTERNAL FIT-UP DESIGNATION: STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORCOUNTERBORED OUTER RING, NON-SEPARABLE
STYLE DESIGNATORCOUNTERBORED OUTER RING, NON-SEPARABLE
STANDARD TOLERANCE DESIGNATIONABEC NO.1
MATERIALSTEEL INNER RING
MATERIALSTEEL INNER RING
MATERIALPLASTIC PHENOLIC RETAINER
MATERIALSTEEL BALL
INTERNAL FIT-UP DESIGNATIONSTANDARD
LOAD DIRECTIONRADIAL
BORE SHAPESTRAIGHT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
MI38Interchangeable
interchangeable cross-reference
interchangeable
M1-38Interchangeable
interchangeable cross-reference
interchangeable
27765Interchangeable
interchangeable cross-reference
interchangeable
1610596Interchangeable
interchangeable cross-reference
interchangeable
MILS36567Interchangeable
interchangeable cross-reference
interchangeable
6539NCM217399Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 138R?
138R is a BEARING,BALL,ANNULAR.
What parts can replace 138R?
There are 11 known substitutes for 138R: MI38, M1-38, 27765 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 138R?
138R is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-5298. 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