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Technical Data Sheet
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646-4 — Technical Data Sheet

✓ 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

CONE AND ROLLERS,TAPERED ROLLER. Key specifications include material: ALUMINUM FRAME, body_width: 2.813 INCHES NOMINAL IN, cone_width: 2.1350 INCHES NOMINAL IN, body_height: 3.500 INCHES NOMINAL IN, body_length: 3.250 INCHES NOMINAL IN, flexibility: FLEXIBLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 3110-00-100-3125, 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
646-4
NSN: 3110-00-100-3125
FSC: 3110
CAGE: 0LTL1 — NTN BEARING CORPORATION OF AMERICA (USA)
SPECIFICATIONS
materialALUMINUM FRAME
body_width2.813 INCHES NOMINAL IN
cone_width2.1350 INCHES NOMINAL IN
body_height3.500 INCHES NOMINAL IN
body_length3.250 INCHES NOMINAL IN
flexibilityFLEXIBLE
temp_rating-65.0 FAHRENHEIT AND 250.0 FAHRENHEIT SINGLE RESPONSE DEGF
thread_class2A SINGLE THREADED PORTION A
bore_diameter2.5575 INCHES NOMINAL IN
overall_width16.000 INCHES NOMINAL IN
thread_length0.125 INCHES NOMINAL SINGLE THREADED PORTION IN
exterior_colorBLACK
NSN3110-00-100-3125
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 646-4 · 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
•
CONE CORNER RADIUS: 0.1406 INCHES NOMINAL IN
•
CONE WIDTH: 2.1350 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NORMAL ANGLE
•
MATERIAL: STEEL OVERALL
•
BORE DIAMETER: 2.5575 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
TYPICAL APPLICATIONS
  • Long-term data archival and compliance retention
  • Offsite backup and disaster recovery
  • Air-gapped ransomware protection
  • Cold storage tier for infrequently accessed data
TECHNICAL CHARACTERISTICS
CONE CORNER RADIUS0.1406 INCHES NOMINAL IN
CONE WIDTH2.1350 INCHES NOMINAL IN
STYLE DESIGNATORNORMAL ANGLE
MATERIALSTEEL OVERALL
BORE DIAMETER2.5575 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
BAR125-8InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
PA-0090-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
7491InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
074914InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
ES661200InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
182108-2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 646-4?
646-4 is a CONE AND ROLLERS,TAPERED ROLLER.
What parts can replace 646-4?
There are 24 known substitutes for 646-4: BAR125-8, PA-0090-1, 7491 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 646-4?
646-4 is cataloged in the Federal Logistics Information System under NSN 3110-00-100-3125. 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: September 2026