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Technical Data Sheet
PartsTable / COMPONENT / MMS1K7DF
MMS1K7DF ✓ 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 OVERALL, bore_diameter: 0.2500 INCHES NOMINAL IN, overall_width: 0.3920 INCHES NOMINAL IN, load_direction: RADIAL, surface_finish: GROUND, style_designator: NON-LOADING GROOVE, NON-SEPARABLE, TANDEM MOUNTING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-198-2051, 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
MMS1K7DF
NSN: 3110-00-198-2051
FSC: 3110
CAGE: 21335 — TIMKEN CO DIV THE TIMKEN COMPANY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_diameter0.2500 INCHES NOMINAL IN
overall_width0.3920 INCHES NOMINAL IN
load_directionRADIAL
surface_finishGROUND
style_designatorNON-LOADING GROOVE, NON-SEPARABLE, TANDEM MOUNTING
overall_outside_diameter0.6250 INCHES NOMINAL IN
bearing_preload_designationLIGHT
retainer_fabrication_methodPRESSED
standard_tolerance_designationABEC NO.7
NSN3110-00-198-2051
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: MMS1K7DF · 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
•
RETAINER FABRICATION METHOD: PRESSED
•
BORE DIAMETER: 0.2500 INCHES NOMINAL IN
•
BEARING PRELOAD DESIGNATION: LIGHT
•
STYLE DESIGNATOR: NON-LOADING GROOVE, NON-SEPARABLE, TANDEM MOUNTING
•
LOAD DIRECTION: RADIAL
•
MATERIAL: STEEL OVERALL
•
SURFACE FINISH: GROUND
TECHNICAL CHARACTERISTICS (FLIS)
RETAINER FABRICATION METHODPRESSED
BORE DIAMETER0.2500 INCHES NOMINAL IN
BEARING PRELOAD DESIGNATIONLIGHT
OVERALL WIDTH0.3920 INCHES NOMINAL IN
STYLE DESIGNATORNON-LOADING GROOVE, NON-SEPARABLE, TANDEM MOUNTING
LOAD DIRECTIONRADIAL
MATERIALSTEEL OVERALL
SURFACE FINISHGROUND
OVERALL OUTSIDE DIAMETER0.6250 INCHES NOMINAL IN
BEARING PRELOAD DESIGNATIONLIGHT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
177030-106Interchangeable
interchangeable cross-reference
interchangeable
1577Interchangeable
interchangeable cross-reference
interchangeable
MIL-B-81793CInterchangeable
interchangeable cross-reference
interchangeable
R3DS5172Interchangeable
interchangeable cross-reference
interchangeable
SSRS77R3DZC1826E3Interchangeable
interchangeable cross-reference
interchangeable
1204301-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MMS1K7DF?
MMS1K7DF is a BEARING,BALL,ANNULAR.
What parts can replace MMS1K7DF?
There are 27 known substitutes for MMS1K7DF: 177030-106, 1577, MIL-B-81793C and 24 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MMS1K7DF?
MMS1K7DF is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-198-2051. 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