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Technical Data Sheet
PartsTable / COMPONENT / K381
K381 ✓ 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,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include phase: THREE INPUT, material: STEEL OVERALL, bore_shape: STRAIGHT, head_style: FLAT CHAMFER, head_height: 0.125 INCHES NOMINAL IN, point_style: CUP. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-293-9163, 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
K381
NSN: 3110-00-293-9163
FSC: 3110
CAGE: 30798 — AMCA INTL CORP INSLEY MFG CORP DIV (USA)
SPECIFICATIONS
phaseTHREE INPUT
materialSTEEL OVERALL
bore_shapeSTRAIGHT
head_styleFLAT CHAMFER
head_height0.125 INCHES NOMINAL IN
point_styleCUP
point_length0.125 INCHES NOMINAL IN
power_rating0.500 HORSEPOWER OUTPUT
thread_class3A A
bore_diameter25.00 MILLIMETERS NOMINAL MM
head_diameter0.172 INCHES NOMINAL IN
overall_width15.0 MILLIMETERS NOMINAL MM
NSN3110-00-293-9163
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: K381 · 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: 52.00 MILLIMETERS NOMINAL MM
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: NON-LOADING GROOVE, NON-SEPARABLE
•
LOAD DIRECTION: RADIAL
•
BORE SHAPE: STRAIGHT
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
SURFACE FINISH: GROUND
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL OUTSIDE DIAMETER52.00 MILLIMETERS NOMINAL MM
MATERIALSTEEL OVERALL
STYLE DESIGNATORNON-LOADING GROOVE, NON-SEPARABLE
LOAD DIRECTIONRADIAL
OVERALL WIDTH15.0 MILLIMETERS NOMINAL MM
BORE SHAPESTRAIGHT
STANDARD TOLERANCE DESIGNATIONABEC NO.1
SURFACE FINISHGROUND
RETAINER FABRICATION METHODPRESSED
BORE DIAMETER25.00 MILLIMETERS NOMINAL MM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 34
80-010Interchangeable
interchangeable cross-reference
interchangeable
8525010.001Interchangeable
interchangeable cross-reference
interchangeable
55310Interchangeable
interchangeable cross-reference
interchangeable
454148-2Interchangeable
interchangeable cross-reference
interchangeable
3205180Interchangeable
interchangeable cross-reference
interchangeable
15157PInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is K381?
K381 is a BEARING,BALL,ANNULAR.
What parts can replace K381?
There are 34 known substitutes for K381: 80-010, 8525010.001, 55310 and 31 more. Substitute compatibility should be verified for your specific system.
Is K381 still available?
K381 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