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Technical Data Sheet
PartsTable / COMPONENT / CM21-8
CM21-8 ✓ 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,ROLLER,CYLINDRICAL is a the manufacturer industrial component. Key specifications include material: PLASTIC MOUNTING, bore_shape: STRAIGHT, bore_diameter: 90.0 MILLIMETERS NOMINAL MM, overall_width: 30.0 MILLIMETERS NOMINAL MM, terminal_type: PIN, overall_height: 0.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-155-7378, 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
CM21-8
NSN: 3110-00-155-7378
FSC: 3110
CAGE: 02780 — AMERICAN ROLLER BEARING INC (USA)
SPECIFICATIONS
materialPLASTIC MOUNTING
bore_shapeSTRAIGHT
bore_diameter90.0 MILLIMETERS NOMINAL MM
overall_width30.0 MILLIMETERS NOMINAL MM
terminal_typePIN
overall_height0.500 INCHES NOMINAL IN
surface_finishGROUND
mounting_methodPANEL LOCATION NOT OTHERWISE SPECIFIED
locating_featureNONLOCATING
outside_diameter0.312 INCHES NOMINAL IN
style_designatorWIRE LEADS
voltage_in_volts125.0
NSN3110-00-155-7378
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: CM21-8 · 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
•
BORE DIAMETER: 90.0 MILLIMETERS NOMINAL MM
•
MATERIAL: STEEL OUTER RING
•
STANDARD TOLERANCE DESIGNATION: RBEC NO.1
•
OVERALL OUTSIDE DIAMETER: 160.0 MILLIMETERS NOMINAL MM
•
INTERNAL FIT-UP DESIGNATION: STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
BORE DIAMETER90.0 MILLIMETERS NOMINAL MM
MATERIALSTEEL OUTER RING
MATERIALSTEEL ROLLER
MATERIALSTEEL INNER RING
STANDARD TOLERANCE DESIGNATIONRBEC NO.1
OVERALL WIDTH30.0 MILLIMETERS NOMINAL MM
OVERALL OUTSIDE DIAMETER160.0 MILLIMETERS NOMINAL MM
INTERNAL FIT-UP DESIGNATIONSTANDARD
SURFACE FINISHGROUND
STYLE DESIGNATORSINGLE ROW, NON-LOCATING, TWO LIP INNER RING, CYLINDRICAL OUTER RING, SEPARABLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
A218Interchangeable
interchangeable cross-reference
interchangeable
R190Interchangeable
interchangeable cross-reference
interchangeable
342526Interchangeable
interchangeable cross-reference
interchangeable
30123DInterchangeable
interchangeable cross-reference
interchangeable
07FC009NInterchangeable
interchangeable cross-reference
interchangeable
2-218N-7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is CM21-8?
CM21-8 is a BEARING,ROLLER,CYLINDRICAL.
What parts can replace CM21-8?
There are 24 known substitutes for CM21-8: A218, R190, 342526 and 21 more. Substitute compatibility should be verified for your specific system.
Is CM21-8 still available?
CM21-8 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