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Technical Data Sheet
PartsTable / COMPONENT / TM643
TM643 ✓ 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,TAPERED is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include material: STEEL OVERALL, cup_width: 0.8750 INCHES NOMINAL IN, cone_width: 1.1720 INCHES NOMINAL IN, body_length: 0.500 INCHES NOMINAL IN, bore_diameter: 3.2500 INCHES NOMINAL IN, overall_width: 1.1875 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-4175, 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
TM643
NSN: 3110-00-100-4175
FSC: 3110
CAGE: 99832 — SCOTT HUBER ESSICK A CO OF FIGGIE INTERNATIONAL INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.8750 INCHES NOMINAL IN
cone_width1.1720 INCHES NOMINAL IN
body_length0.500 INCHES NOMINAL IN
bore_diameter3.2500 INCHES NOMINAL IN
overall_width1.1875 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
standout_width0.3125 INCHES NOMINAL IN
mounting_methodTHREADED HOLE(S) SINGLE GROUP
frequency_rating400.0 HERTZ NOMINAL SINGLE COMPONENT
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.1400 INCHES NOMINAL IN
NSN3110-00-100-4175
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: TM643 · 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
•
OVERALL OUTSIDE DIAMETER: 5.3750 INCHES NOMINAL IN
•
CONE WIDTH: 1.1720 INCHES NOMINAL IN
•
BORE DIAMETER: 3.2500 INCHES NOMINAL IN
•
CUP WIDTH: 0.8750 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.3125 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1400 INCHES NOMINAL IN
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 (FLIS)
OVERALL OUTSIDE DIAMETER5.3750 INCHES NOMINAL IN
CONE WIDTH1.1720 INCHES NOMINAL IN
BORE DIAMETER3.2500 INCHES NOMINAL IN
CUP WIDTH0.8750 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
STANDOUT WIDTH0.3125 INCHES NOMINAL IN
CONE CORNER RADIUS0.1400 INCHES NOMINAL IN
OVERALL WIDTH1.1875 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
382303-00Interchangeable
interchangeable cross-reference
interchangeable
PMC-065-0170Interchangeable
interchangeable cross-reference
interchangeable
382303PHInterchangeable
interchangeable cross-reference
interchangeable
10165Interchangeable
interchangeable cross-reference
interchangeable
1827E018Interchangeable
interchangeable cross-reference
interchangeable
934AHInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is TM643?
TM643 is a BEARING,ROLLER,TAPERED.
What parts can replace TM643?
There are 19 known substitutes for TM643: 382303-00, PMC-065-0170, 382303PH and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for TM643?
TM643 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-4175. 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