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Technical Data Sheet
PartsTable / COMPONENT / M138
M138 ✓ 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 width: 1.250 INCHES NOMINAL IN, height: 0.706 INCHES NOMINAL IN, length: 2.125 INCHES NOMINAL IN, material: PLASTIC CASE, body_style: HEADSET TYPE, bore_shape: STRAIGHT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-5298, 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
M138
NSN: 3110-00-156-5298
FSC: 3110
CAGE: 60380 — TIMKEN AEROSPACE, INC DBA TORRINGTON PRODUCT (USA)
SPECIFICATIONS
width1.250 INCHES NOMINAL IN
height0.706 INCHES NOMINAL IN
length2.125 INCHES NOMINAL IN
materialPLASTIC CASE
body_styleHEADSET TYPE
bore_shapeSTRAIGHT
current_typeAC
bore_diameter2.3750 INCHES NOMINAL IN
inside_length36.000 INCHES NOMINAL IN
mounting_typeSHIPPING CASE
overall_width1.7600 INCHES NOMINAL IN
closure_methodHINGED DOOR W/ LOCKING LEVER AND HAND WHEEL OPERATED
NSN3110-00-156-5298
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: M138 · 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
•
STYLE DESIGNATOR: COUNTERBORED OUTER RING, NON-SEPARABLE
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
MATERIAL: STEEL INNER RING
•
INTERNAL FIT-UP DESIGNATION: STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORCOUNTERBORED OUTER RING, NON-SEPARABLE
STYLE DESIGNATORCOUNTERBORED OUTER RING, NON-SEPARABLE
STANDARD TOLERANCE DESIGNATIONABEC NO.1
MATERIALSTEEL INNER RING
MATERIALSTEEL INNER RING
MATERIALPLASTIC PHENOLIC RETAINER
MATERIALSTEEL BALL
INTERNAL FIT-UP DESIGNATIONSTANDARD
LOAD DIRECTIONRADIAL
BORE SHAPESTRAIGHT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
MI38Interchangeable
interchangeable cross-reference
interchangeable
M1-38Interchangeable
interchangeable cross-reference
interchangeable
27765Interchangeable
interchangeable cross-reference
interchangeable
1610596Interchangeable
interchangeable cross-reference
interchangeable
MILS36567Interchangeable
interchangeable cross-reference
interchangeable
6539NCM217399Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M138?
M138 is a BEARING,BALL,ANNULAR.
What parts can replace M138?
There are 12 known substitutes for M138: MI38, M1-38, 27765 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M138?
M138 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-5298. 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