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Technical Data Sheet
PartsTable / COMPONENT / 78250-78551
78250-78551 ✓ 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: 0.9260 INCHES NOMINAL IN, cone_width: 1.3085 INCHES NOMINAL IN, bore_diameter: 2.5000 INCHES NOMINAL IN, overall_width: 1.4375 INCHES NOMINAL IN, standout_width: 0.5115 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 3110-00-100-5831, 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
78250-78551
NSN: 3110-00-100-5831
FSC: 3110
CAGE: 54845 — HOIST LIFTRUCK MFG INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.9260 INCHES NOMINAL IN
cone_width1.3085 INCHES NOMINAL IN
bore_diameter2.5000 INCHES NOMINAL IN
overall_width1.4375 INCHES NOMINAL IN
standout_width0.5115 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, STEEP ANGLE
cone_corner_radius0.0930 INCHES NOMINAL IN
backface_corner_radius0.0930 INCHES NOMINAL IN
overall_outside_diameter5.5130 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-5831
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 78250-78551 · 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: 0.0930 INCHES NOMINAL IN
•
CUP WIDTH: 0.9260 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.5115 INCHES NOMINAL IN
•
BORE DIAMETER: 2.5000 INCHES NOMINAL IN
•
OVERALL OUTSIDE DIAMETER: 5.5130 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.0930 INCHES NOMINAL IN
•
CONE WIDTH: 1.3085 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)
CONE CORNER RADIUS0.0930 INCHES NOMINAL IN
OVERALL WIDTH1.4375 INCHES NOMINAL IN
CUP WIDTH0.9260 INCHES NOMINAL IN
STANDOUT WIDTH0.5115 INCHES NOMINAL IN
BORE DIAMETER2.5000 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER5.5130 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0930 INCHES NOMINAL IN
CONE WIDTH1.3085 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, STEEP ANGLE
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
BT363Interchangeable
interchangeable cross-reference
interchangeable
363Interchangeable
interchangeable cross-reference
interchangeable
372AInterchangeable
interchangeable cross-reference
interchangeable
94289Interchangeable
interchangeable cross-reference
interchangeable
5520Interchangeable
interchangeable cross-reference
interchangeable
BT5520Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 78250-78551?
78250-78551 is a BEARING,ROLLER,TAPERED.
What parts can replace 78250-78551?
There are 26 known substitutes for 78250-78551: BT363, 363, 372A and 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 78250-78551?
78250-78551 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-5831. 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