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Technical Data Sheet
PartsTable / COMPONENT / 394A390
394A390 ✓ 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: 0.7411 INCHES NOMINAL IN, cone_width: 0.8661 INCHES NOMINAL IN, bore_diameter: 2.2500 INCHES NOMINAL IN, overall_width: 0.8661 INCHES NOMINAL IN, standout_width: 0.1250 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 3110-00-100-3897, 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
394A390
NSN: 3110-00-100-3897
FSC: 3110
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.7411 INCHES NOMINAL IN
cone_width0.8661 INCHES NOMINAL IN
bore_diameter2.2500 INCHES NOMINAL IN
overall_width0.8661 INCHES NOMINAL IN
standout_width0.1250 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.0930 INCHES NOMINAL IN
backface_corner_radius0.0460 INCHES NOMINAL IN
overall_outside_diameter4.3307 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-3897
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 394A390 · 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
•
STANDOUT WIDTH: 0.1250 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
BACKFACE CORNER RADIUS: 0.0460 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.0930 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
OVERALL OUTSIDE DIAMETER: 4.3307 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)
STANDOUT WIDTH0.1250 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
OVERALL WIDTH0.8661 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
BACKFACE CORNER RADIUS0.0460 INCHES NOMINAL IN
CONE CORNER RADIUS0.0930 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
OVERALL OUTSIDE DIAMETER4.3307 INCHES NOMINAL IN
CONE WIDTH0.8661 INCHES NOMINAL IN
CUP WIDTH0.7411 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
12AY7Interchangeable
interchangeable cross-reference
interchangeable
254-0866-00Interchangeable
interchangeable cross-reference
interchangeable
MIL-E-1/639Interchangeable
interchangeable cross-reference
interchangeable
A29317Interchangeable
interchangeable cross-reference
interchangeable
29317Interchangeable
interchangeable cross-reference
interchangeable
11171-29-11GInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 394A390?
394A390 is a BEARING,ROLLER,TAPERED.
What parts can replace 394A390?
There are 16 known substitutes for 394A390: 12AY7, 254-0866-00, MIL-E-1/639 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 394A390?
394A390 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-3897. 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