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Technical Data Sheet
PartsTable / COMPONENT / A30-203FS4
A30-203FS4 ✓ 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: 17.00 MILLIMETERS NOMINAL MM, load_direction: RADIAL, surface_finish: GROUND, inner_ring_width: 0.5470 INCHES NOMINAL 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 3110-00-156-4218, 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
A30-203FS4
NSN: 3110-00-156-4218
FSC: 3110
CAGE: 89549 — MIDWEST METAL STAMPING CO INC
SPECIFICATIONS
materialSTEEL INNER RING
bore_shapeSTRAIGHT
bore_diameter17.00 MILLIMETERS NOMINAL MM
seal_quantity1
load_directionRADIAL
surface_finishGROUND
inner_ring_width0.5470 INCHES NOMINAL IN
outer_ring_width0.5630 INCHES NOMINAL IN
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
bearing_seal_typeCONTACT
overall_outside_diameter40.00 MILLIMETERS NOMINAL MM
internal_fit-up_designationSTANDARD
NSN3110-00-156-4218
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: A30-203FS4 · 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: 40.00 MILLIMETERS NOMINAL MM
•
SEAL QUANTITY: 1
•
BEARING SEAL TYPE: CONTACT
•
MATERIAL: RUBBER SYNTHETIC SEAL
•
NONDEFINITIVE SPEC/STD DATA: 118 TYPE AND 00 GRADE AND 1 CLASS
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL OUTSIDE DIAMETER40.00 MILLIMETERS NOMINAL MM
SEAL QUANTITY1
BEARING SEAL TYPECONTACT
MATERIALRUBBER SYNTHETIC SEAL
NONDEFINITIVE SPEC/STD DATA118 TYPE AND 00 GRADE AND 1 CLASS
MATERIALSTEEL BALL
MATERIALSTEEL RETAINER
MATERIALSTEEL INNER RING
MATERIALSTEEL INNER RING
STYLE DESIGNATORNON-LOADING GROOVE, NON-SEPARABLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
RFC-S-18Interchangeable
interchangeable cross-reference
interchangeable
7071Interchangeable
interchangeable cross-reference
interchangeable
G360578-4Interchangeable
interchangeable cross-reference
interchangeable
00250-0023Interchangeable
interchangeable cross-reference
interchangeable
7017Interchangeable
interchangeable cross-reference
interchangeable
1-3514Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A30-203FS4?
A30-203FS4 is a BEARING,BALL,ANNULAR.
What parts can replace A30-203FS4?
There are 30 known substitutes for A30-203FS4: RFC-S-18, 7071, G360578-4 and 27 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A30-203FS4?
A30-203FS4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-4218. 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