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Technical Data Sheet
PartsTable / COMPONENT / 188251
188251 ✓ 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

CONE AND ROLLERS,TAPERED ROLLER. Key specifications include material: STEEL COMP 630 OVERALL, corner_shape: ROUND INSIDE LEFT CORNER, flange_width: 0.1900 INCHES MINIMUM AND 0.2000 INCHES MAXIMUM IN, overall_length: 4.9400 INCHES NOMINAL IN, surface_finish: 125.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY, hardness_rating: 33.0 ROCKWELL C NOMINAL OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0690, 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
188251
NSN: 3110-00-100-0690
FSC: 3110
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 630 OVERALL
corner_shapeROUND INSIDE LEFT CORNER
flange_width0.1900 INCHES MINIMUM AND 0.2000 INCHES MAXIMUM IN
overall_length4.9400 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
hardness_rating33.0 ROCKWELL C NOMINAL OVERALL
style_designatorSOLID, EXTERNAL FLANGE ONE END
surface_treatmentCADMIUM LEFT END SURFACE OF BODY AND FLANGE
body_inside_diameter4.8760 INCHES MINIMUM AND 4.8775 INCHES MAXIMUM IN
body_outside_diameter5.0750 INCHES MINIMUM AND 5.0850 INCHES MAXIMUM IN
flange_outside_diameter5.7400 INCHES MINIMUM AND 5.7600 INCHES MAXIMUM IN
material_document_and_classificationAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN3110-00-100-0690
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 188251 · 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
•
CONE WIDTH: 1.9000 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
STYLE DESIGNATOR: NORMAL ANGLE
•
BORE DIAMETER: 2.8750 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1006 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
TYPICAL APPLICATIONS
  • Long-term data archival and compliance retention
  • Offsite backup and disaster recovery
  • Air-gapped ransomware protection
  • Cold storage tier for infrequently accessed data
TECHNICAL CHARACTERISTICS (FLIS)
CONE WIDTH1.9000 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
STYLE DESIGNATORNORMAL ANGLE
BORE DIAMETER2.8750 INCHES NOMINAL IN
CONE CORNER RADIUS0.1006 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
A-A-50553Interchangeable
interchangeable cross-reference
interchangeable
5320Interchangeable
interchangeable cross-reference
interchangeable
1924Interchangeable
interchangeable cross-reference
interchangeable
B36125Interchangeable
interchangeable cross-reference
interchangeable
554-2065-4Interchangeable
interchangeable cross-reference
interchangeable
294539Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 188251?
188251 is a CONE AND ROLLERS,TAPERED ROLLER.
What parts can replace 188251?
There are 17 known substitutes for 188251: A-A-50553, 5320, 1924 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 188251?
188251 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-0690. 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