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Technical Data Sheet
PartsTable / MRO / 78551
78551 ✓ Verified by PartsTable
Legrand · MRO · MRO_GENERAL
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

MOUNTING BASE,ELECTRICAL EQUIPME. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0619, 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
MRO→ MRO_GENERAL→ 78551
NSN: 3110-00-100-0619
FSC: 3110
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
Part Number78551
ManufacturerLegrand
NSN3110-00-100-0619
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 78551 · Legrand ⚠ 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
•
BACKFACE CORNER RADIUS: 0.0940 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
STYLE DESIGNATOR: NORMAL ANGLE
•
MATERIAL: STEEL OVERALL
•
OUTSIDE DIAMETER: 5.5130 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BACKFACE CORNER RADIUS0.0940 INCHES NOMINAL IN
OVERALL WIDTH0.9260 INCHES NOMINAL IN
SPECIAL FEATURESSTEEP ANGLE
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
STYLE DESIGNATORNORMAL ANGLE
MATERIALSTEEL OVERALL
OUTSIDE DIAMETER5.5130 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
01158100Interchangeable
interchangeable cross-reference
interchangeable
119275Interchangeable
interchangeable cross-reference
interchangeable
3100C3-180NInterchangeable
interchangeable cross-reference
interchangeable
14-85437-00Interchangeable
interchangeable cross-reference
interchangeable
A15437Interchangeable
interchangeable cross-reference
interchangeable
500Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 78551?
78551 is a MOUNTING BASE,ELECTRICAL EQUIPME manufactured by Legrand. It is classified as a MRO (MRO_GENERAL).
What parts can replace 78551?
There are 25 known substitutes for 78551: 01158100, 119275, 3100C3-180N and 22 more. Substitute compatibility should be verified for your specific system.
Is 78551 still available?
78551 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: July 2026