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Technical Data Sheet
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309U — BEARING,BALL,ANNULAR

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

309U: BEARING,BALL,ANNULAR.

The BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL COMP E9310 OVERALL, body_style: WEBBED, WITH LIGHTENING HOLES, bore_style: PLAIN BOTH ENDS, teeth_type: SPIRAL, pitch_angle: 17.0000 DEGREES, pitch_diameter: 2.8182 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-156-4877, 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
309U
NSN: 3110-00-156-4877
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP E9310 OVERALL
body_styleWEBBED, WITH LIGHTENING HOLES
bore_stylePLAIN BOTH ENDS
teeth_typeSPIRAL
pitch_angle17.0000 DEGREES
pitch_diameter2.8182 INCHES NOMINAL IN
pressure_angle16.0000 DEGREES
teeth_quantity31
hardness_rating82.0 ROCKWELL A NOMINAL OVERALL
tooth_directionLEFT
style_designatorSIDE FACE, PROTRUDING HUBS
end_nominal_length0.275 INCHES FIRST END IN
NSN3110-00-156-4877
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 309U · 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
SUBSTITUTES & CROSS-REFERENCES 5
45309WReference document
Same NSN cross-reference
Reference document — Secondary reference
714436Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VM1208AReference document
Same NSN cross-reference
Reference document — Secondary reference
710177Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VM1208Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 309U?
309U is a BEARING,BALL,ANNULAR.
What parts can replace 309U?
There are 5 known substitutes for 309U: 45309W, 714436, VM1208A and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 309U?
309U is cataloged in the U.S. Government catalog under NSN 3110-00-156-4877. 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.