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M311-3MBRDT — BEARING,BALL,DUPLEX

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

M311-3MBRDT: BEARING,BALL,DUPLEX.

The BEARING,BALL,DUPLEX is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY RETAINER, bore_diameter: 2.1634 INCHES NOMINAL IN, overall_width: 2.2834 INCHES NOMINAL IN, load_direction: ANGULAR, surface_finish: GROUND, style_designator: COUNTERBORED OUTER RINGS, NON-SEPARABLE, TANDEM MOUNTING. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-113-3671, 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
M311-3MBRDT
NSN: 3110-00-113-3671
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 21335 — TIMKEN CO DIV THE TIMKEN COMPANY (USA)
SPECIFICATIONS
materialCOPPER ALLOY RETAINER
bore_diameter2.1634 INCHES NOMINAL IN
overall_width2.2834 INCHES NOMINAL IN
load_directionANGULAR
surface_finishGROUND
style_designatorCOUNTERBORED OUTER RINGS, NON-SEPARABLE, TANDEM MOUNTING
internal_clearance0.0043 INCHES MINIMUM RADIAL AND 0.0054 INCHES MAXIMUM RADIAL IN
overall_outside_diameter4.7244 INCHES NOMINAL IN
standard_tolerance_designationABEC NO.5
NSN3110-00-113-3671
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: M311-3MBRDT · 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
•
INTERNAL CLEARANCE: 0.0043 INCHES MINIMUM RADIAL AND 0.0054 INCHES MAXIMUM RADIAL IN
•
SURFACE FINISH: GROUND
•
STYLE DESIGNATOR: COUNTERBORED OUTER RINGS, NON-SEPARABLE, TANDEM MOUNTING
•
OVERALL OUTSIDE DIAMETER: 4.7244 INCHES NOMINAL IN
•
LOAD DIRECTION: ANGULAR
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.5
•
BORE DIAMETER: 2.1634 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
INTERNAL CLEARANCE0.0043 INCHES MINIMUM RADIAL AND 0.0054 INCHES MAXIMUM RADIAL IN
SURFACE FINISHGROUND
STYLE DESIGNATORCOUNTERBORED OUTER RINGS, NON-SEPARABLE, TANDEM MOUNTING
OVERALL WIDTH2.2834 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER4.7244 INCHES NOMINAL IN
LOAD DIRECTIONANGULAR
STANDARD TOLERANCE DESIGNATIONABEC NO.5
BORE DIAMETER2.1634 INCHES NOMINAL IN
MATERIALSTEEL OUTER RING
MATERIALSTEEL INNER RING
OTHER ITEMS IN FSC 3110 — Bearings, Antifriction, Unmounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3110-00-001-1937 3110-00-001-1938 3110-00-001-4661 3110-00-001-4662 3110-00-001-4689 3110-00-001-4722
SUBSTITUTES & CROSS-REFERENCES 1
K674389-11Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M311-3MBRDT?
M311-3MBRDT is a BEARING,BALL,DUPLEX.
What parts can replace M311-3MBRDT?
There is 1 known substitute for M311-3MBRDT: K674389-11. Substitute compatibility should be verified for your specific system.
What is the NSN for M311-3MBRDT?
M311-3MBRDT is cataloged in the U.S. Government catalog under NSN 3110-00-113-3671. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.