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Technical Data Sheet
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BT478 — Technical Data Sheet

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— · 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: STEEL OVERALL, cone_width: 1.1420 INCHES NOMINAL IN, bore_diameter: 2.5591 INCHES NOMINAL IN, style_designator: NORMAL ANGLE, cone_corner_radius: 0.0938 INCHES NOMINAL IN, standard_tolerance_designation: AFBMA CLASS 2. This part is cataloged in the Federal Logistics Information System under NSN 3110-00-100-0255, 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
BT478
NSN: 3110-00-100-0255
FSC: 3110
CAGE: 01212 — FEDERAL-MOGUL CORP GOVERNMENT SALES DEPT (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cone_width1.1420 INCHES NOMINAL IN
bore_diameter2.5591 INCHES NOMINAL IN
style_designatorNORMAL ANGLE
cone_corner_radius0.0938 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-0255
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: BT478 · 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
•
BORE DIAMETER: 2.5591 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.0938 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NORMAL ANGLE
•
MATERIAL: STEEL OVERALL
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
CONE WIDTH: 1.1420 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
BORE DIAMETER2.5591 INCHES NOMINAL IN
CONE CORNER RADIUS0.0938 INCHES NOMINAL IN
STYLE DESIGNATORNORMAL ANGLE
MATERIALSTEEL OVERALL
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
CONE WIDTH1.1420 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
AS954InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
478InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
B107.1 CL3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
GT800AW1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
34InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
578-2.5InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BT478?
BT478 is a CONE AND ROLLERS,TAPERED ROLLER.
What parts can replace BT478?
There are 20 known substitutes for BT478: AS954, 478, B107.1 CL3 and 17 more. Substitute compatibility should be verified for your specific system.
Is BT478 still available?
BT478 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026