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A17978 — CONNECTOR,RECEPTACLE,ELECTRICAL

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

A17978: CONNECTOR,RECEPTACLE,ELECTRICAL.

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: STEEL OVERALL, cup_width: 0.8125 INCHES NOMINAL IN, cone_width: 1.0000 INCHES NOMINAL IN, bore_diameter: 1.6880 INCHES NOMINAL IN, overall_width: 1.0000 INCHES NOMINAL IN, standout_width: 0.1875 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-980-4858, 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
A17978
NSN: 3110-00-980-4858
NIINs: 009804858, 013785315
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 10988 — CNH INDUSTRIAL AMERICA LLC DBA CNH AMERICA (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.8125 INCHES NOMINAL IN
cone_width1.0000 INCHES NOMINAL IN
bore_diameter1.6880 INCHES NOMINAL IN
overall_width1.0000 INCHES NOMINAL IN
standout_width0.1875 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.0600 INCHES NOMINAL IN
backface_corner_radius0.0300 INCHES NOMINAL IN
overall_outside_diameter3.1562 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-980-4858
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: A17978 · 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
•
CUP WIDTH: 0.8125 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
OVERALL OUTSIDE DIAMETER: 3.1562 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.0300 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.0600 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.1875 INCHES NOMINAL IN
•
CONE WIDTH: 1.0000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CUP WIDTH0.8125 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
OVERALL WIDTH1.0000 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER3.1562 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0300 INCHES NOMINAL IN
CONE CORNER RADIUS0.0600 INCHES NOMINAL IN
STANDOUT WIDTH0.1875 INCHES NOMINAL IN
CONE WIDTH1.0000 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BORE DIAMETER1.6880 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
223270Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A17978?
A17978 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace A17978?
There is 1 known substitute for A17978: 223270. Substitute compatibility should be verified for your specific system.
What is the NSN for A17978?
A17978 is cataloged in the U.S. Government catalog under NSN 3110-00-980-4858. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.