PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 8138523
8138523 ✓ 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: 1.3750 INCHES NOMINAL IN, cone_width: 1.9375 INCHES NOMINAL IN, bore_diameter: 4.0000 INCHES NOMINAL IN, overall_width: 2.0772 INCHES NOMINAL IN, standout_width: 0.7022 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 3110-00-100-5838, 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
8138523
NSN: 3110-00-100-5838
FSC: 3110
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width1.3750 INCHES NOMINAL IN
cone_width1.9375 INCHES NOMINAL IN
bore_diameter4.0000 INCHES NOMINAL IN
overall_width2.0772 INCHES NOMINAL IN
standout_width0.7022 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, STEEP ANGLE
cone_corner_radius0.1400 INCHES NOMINAL IN
backface_corner_radius0.1250 INCHES NOMINAL IN
overall_outside_diameter7.8740 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-5838
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 8138523 · 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: 7.8740 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1400 INCHES NOMINAL IN
•
BORE DIAMETER: 4.0000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, STEEP ANGLE
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
CUP WIDTH: 1.3750 INCHES NOMINAL IN
•
CONE WIDTH: 1.9375 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 DIAMETER7.8740 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
CONE CORNER RADIUS0.1400 INCHES NOMINAL IN
BORE DIAMETER4.0000 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, STEEP ANGLE
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
CUP WIDTH1.3750 INCHES NOMINAL IN
CONE WIDTH1.9375 INCHES NOMINAL IN
STANDOUT WIDTH0.7022 INCHES NOMINAL IN
OVERALL WIDTH2.0772 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
44348-44162Interchangeable
interchangeable cross-reference
interchangeable
344162-348Interchangeable
interchangeable cross-reference
interchangeable
44162-44348Interchangeable
interchangeable cross-reference
interchangeable
330-7Interchangeable
interchangeable cross-reference
interchangeable
USAF330-7Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8138523?
8138523 is a BEARING,ROLLER,TAPERED.
What parts can replace 8138523?
There are 32 known substitutes for 8138523: 44348-44162, 344162-348, 44162-44348 and 29 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 8138523?
8138523 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-5838. 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