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B-303-28C-D — BEARING,BALL,DUPLEX

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

B-303-28C-D: BEARING,BALL,DUPLEX.

The BEARING,BALL,DUPLEX is a the manufacturer industrial component. Key specifications include bore_diameter: 0.24985 INCHES MINIMUM AND 0.24990 INCHES MAXIMUM IN, overall_width: 0.2190 INCHES NOMINAL IN, surface_finish: GROUND, overall_outside_diameter: 0.39040 INCHES MINIMUM AND 0.39045 INCHES MAXIMUM IN, standard_tolerance_designation: ABEC NO. 9P.

This part is cataloged in the U.S. Government catalog under NSN 3110-01-113-8840, 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
B-303-28C-D
NSN: 3110-01-113-8840
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 40920 — MPB CORP DIV TIMKEN SUPER PRECISION (USA)
SPECIFICATIONS
bore_diameter0.24985 INCHES MINIMUM AND 0.24990 INCHES MAXIMUM IN
overall_width0.2190 INCHES NOMINAL IN
surface_finishGROUND
overall_outside_diameter0.39040 INCHES MINIMUM AND 0.39045 INCHES MAXIMUM IN
standard_tolerance_designationABEC NO. 9P
NSN3110-01-113-8840
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: B-303-28C-D · 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
•
SURFACE FINISH: GROUND
•
OVERALL OUTSIDE DIAMETER: 0.39040 INCHES MINIMUM AND 0.39045 INCHES MAXIMUM IN
•
STANDARD TOLERANCE DESIGNATION: ABEC NO. 9P
•
BORE DIAMETER: 0.24985 INCHES MINIMUM AND 0.24990 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISHGROUND
OVERALL WIDTH0.2190 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER0.39040 INCHES MINIMUM AND 0.39045 INCHES MAXIMUM IN
STANDARD TOLERANCE DESIGNATIONABEC NO. 9P
BORE DIAMETER0.24985 INCHES MINIMUM AND 0.24990 INCHES MAXIMUM IN
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
2192628-28Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
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 B-303-28C-D?
B-303-28C-D is a BEARING,BALL,DUPLEX.
What parts can replace B-303-28C-D?
There is 1 known substitute for B-303-28C-D: 2192628-28. Substitute compatibility should be verified for your specific system.
What is the NSN for B-303-28C-D?
B-303-28C-D is cataloged in the U.S. Government catalog under NSN 3110-01-113-8840. 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.