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Technical Data Sheet
PartsTable / COMPONENT / A2903
A2903 ✓ 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 material: STEEL INNER RING, bore_shape: STRAIGHT, bore_diameter: 1.8744 INCHES MINIMUM AND 1.8750 INCHES MAXIMUM IN, contact_angle: 15.0 DEGREES NOMINAL, load_direction: ANGULAR, overall_height: 0.6720 INCHES MINIMUM AND 0.6870 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-157-2007, 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
A2903
NSN: 3110-00-157-2007
FSC: 3110
CAGE: 00658 — ABC ACQUISITION COMPANY DBA AETNA BEARING COMPANY (USA)
SPECIFICATIONS
materialSTEEL INNER RING
bore_shapeSTRAIGHT
bore_diameter1.8744 INCHES MINIMUM AND 1.8750 INCHES MAXIMUM IN
contact_angle15.0 DEGREES NOMINAL
load_directionANGULAR
overall_height0.6720 INCHES MINIMUM AND 0.6870 INCHES MAXIMUM IN
surface_finishGROUND
inner_ring_width0.4840 INCHES NOMINAL IN
outer_ring_width0.5660 INCHES NOMINAL IN
special_featuresBANDED OD,FACE OF OUTER RING FORMS LIP WHICH EXTENDS DOWN BEYOND FACE OF INNER RING
style_designatorCLUTCH RELEASE
lubrication_materialGREASE
NSN3110-00-157-2007
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: A2903 · 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: 3.1350 INCHES MAXIMUM IN
•
BORE DIAMETER: 1.8744 INCHES MINIMUM AND 1.8750 INCHES MAXIMUM IN
•
LUBRICATION MATERIAL: GREASE
•
OUTER RING WIDTH: 0.5660 INCHES NOMINAL IN
•
CONTACT ANGLE: 15.0 DEGREES NOMINAL
•
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
•
SURFACE FINISH: GROUND
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL OUTSIDE DIAMETER3.1350 INCHES MAXIMUM IN
BORE DIAMETER1.8744 INCHES MINIMUM AND 1.8750 INCHES MAXIMUM IN
LUBRICATION MATERIALGREASE
OUTER RING WIDTH0.5660 INCHES NOMINAL IN
CONTACT ANGLE15.0 DEGREES NOMINAL
LUBRICATION MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-23827 MIL SPEC SINGLE MATERIAL RESPONSE
SPECIAL FEATURESBANDED OD,FACE OF OUTER RING FORMS LIP WHICH EXTENDS DOWN BEYOND FACE OF INNER RING
SURFACE FINISHGROUND
BORE SHAPESTRAIGHT
LOAD DIRECTIONANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
575-4000-1443959REVAPC35Interchangeable
interchangeable cross-reference
interchangeable
571-4000-1302254REVAPC35Interchangeable
interchangeable cross-reference
interchangeable
3777-102REVAPC35Interchangeable
interchangeable cross-reference
interchangeable
N1065Interchangeable
interchangeable cross-reference
interchangeable
1001Interchangeable
interchangeable cross-reference
interchangeable
V3D10361 ITEM 1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A2903?
A2903 is a BEARING,BALL,ANNULAR.
What parts can replace A2903?
There are 19 known substitutes for A2903: 575-4000-1443959REVAPC35, 571-4000-1302254REVAPC35, 3777-102REVAPC35 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A2903?
A2903 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-157-2007. 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