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Technical Data Sheet
PartsTable / COMPONENT / MR1903G301
MR1903G301 ✓ 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,ROLLER,CYLINDRICAL is a the manufacturer industrial component. Key specifications include material: STEEL ROLLER, bore_shape: STRAIGHT, bore_diameter: 17.0 MILLIMETERS NOMINAL MM, overall_width: 7.0 MILLIMETERS NOMINAL MM, surface_finish: GROUND, locating_feature: ONE DIRECTION. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-863-1194, 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
MR1903G301
NSN: 3110-00-863-1194
FSC: 3110
CAGE: 38443 — SKF USA INC. (USA)
SPECIFICATIONS
materialSTEEL ROLLER
bore_shapeSTRAIGHT
bore_diameter17.0 MILLIMETERS NOMINAL MM
overall_width7.0 MILLIMETERS NOMINAL MM
surface_finishGROUND
locating_featureONE DIRECTION
special_featuresHEAT STABILIZED FOR OPERATION AT M 65 TO P 350 DEG F ROCKWELL HARNESS RATING,RETAINER 47.0 MIN,ROLLERS,INNER AND OUTER RINGS 58.0 TO 62.0 C SCALE DEGF
style_designatorSINGLE ROW, ONE-DIRECTION LOCATING, ONE LIP INNER RING, TWO LIP OUTER RING, SEPARABLE
internal_clearance0.0012 INCHES MINIMUM RADIAL AND 0.0016 INCHES MAXIMUM RADIAL IN
overall_outside_diameter30.0 MILLIMETERS NOMINAL MM
retainer_fabrication_methodMACHINED
standard_tolerance_designationRBEC NO.5
NSN3110-00-863-1194
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: MR1903G301 · 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
•
MATERIAL: STEEL OUTER RING
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6440 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 6441 ASSN STD SINGLE MATERIAL RESPONSE INNER RING
•
STYLE DESIGNATOR: SINGLE ROW, ONE-DIRECTION LOCATING, ONE LIP INNER RING, TWO LIP OUTER RING, SEPARABLE
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESHEAT STABILIZED FOR OPERATION AT M 65 TO P 350 DEG F ROCKWELL HARNESS RATING,RETAINER 47.0 MIN,ROLLERS,INNER AND OUTER RINGS 58.0 TO 62.0 C SCALE DEGF
MATERIALSTEEL OUTER RING
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6440 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 6441 ASSN STD SINGLE MATERIAL RESPONSE INNER RING
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-T-46072 MIL SPEC SINGLE MATERIAL RESPONSE OR 2-300-027,91547 MFR REF SINGLE MATERIAL RESPONSE RETAINER
MATERIALCOPPER ALLOY RETAINER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6440 ASSN STD SINGLE MATERIAL RESPONSE ROLLER
MATERIALSTEEL INNER RING
STYLE DESIGNATORSINGLE ROW, ONE-DIRECTION LOCATING, ONE LIP INNER RING, TWO LIP OUTER RING, SEPARABLE
MATERIALSTEEL ROLLER
BORE SHAPESTRAIGHT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
21068Interchangeable
interchangeable cross-reference
interchangeable
21068ASInterchangeable
interchangeable cross-reference
interchangeable
142-6-3Interchangeable
interchangeable cross-reference
interchangeable
U31A2Interchangeable
interchangeable cross-reference
interchangeable
2106-08-00Interchangeable
interchangeable cross-reference
interchangeable
21068-00Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MR1903G301?
MR1903G301 is a BEARING,ROLLER,CYLINDRICAL.
What parts can replace MR1903G301?
There are 15 known substitutes for MR1903G301: 21068, 21068AS, 142-6-3 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MR1903G301?
MR1903G301 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-863-1194. 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