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RR5M12MILG3278 — BEARING,ROLLER,ROD END

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

RR5M12MILG3278: BEARING,ROLLER,ROD END.

The BEARING,ROLLER,ROD END is a the manufacturer industrial component. Key specifications include material: STEEL SHAFT, shank_style: EXTERNALLY THREADED, thread_class: 3A A, bore_diameter: 0.3125 INCHES NOMINAL IN, alignment_type: SELF-ALIGNING, overall_length: 3.8440 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-293-8338, 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
RR5M12MILG3278
NSN: 3110-00-293-8338
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 21335 — TIMKEN CO DIV THE TIMKEN COMPANY (USA)
SPECIFICATIONS
materialSTEEL SHAFT
shank_styleEXTERNALLY THREADED
thread_class3A A
bore_diameter0.3125 INCHES NOMINAL IN
seal_quantity2
alignment_typeSELF-ALIGNING
overall_length3.8440 INCHES NOMINAL IN
shank_diameter0.7500 INCHES NOMINAL IN
inner_ring_width0.8120 INCHES NOMINAL IN
outer_ring_width0.6560 INCHES NOMINAL IN
special_featuresCARBOLIZE OUTER RING AT RACE POINT
style_designatorSINGLE ROW, CONCAVE ROLLERS
NSN3110-00-293-8338
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: RR5M12MILG3278 · 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
•
SHANK DIAMETER: 0.7500 INCHES NOMINAL IN
•
SHANK THREAD LENGTH: 2.2190 INCHES NOMINAL IN
•
BEARING SEAL TYPE: CONTACT
•
LUBRICATION MATERIAL: GREASE
•
OUTER RING WIDTH: 0.6560 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SINGLE ROW, CONCAVE ROLLERS
•
OVERALL OUTSIDE DIAMETER: 1.4380 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SHANK DIAMETER0.7500 INCHES NOMINAL IN
SHANK THREAD LENGTH2.2190 INCHES NOMINAL IN
BEARING SEAL TYPECONTACT
LUBRICATION MATERIALGREASE
OUTER RING WIDTH0.6560 INCHES NOMINAL IN
STYLE DESIGNATORSINGLE ROW, CONCAVE ROLLERS
OVERALL LENGTH3.8440 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER1.4380 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.750 INCHES 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 2
RR5M12FS237Reference document
Same NSN cross-reference
Reference document — Secondary reference
RR5M12Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is RR5M12MILG3278?
RR5M12MILG3278 is a BEARING,ROLLER,ROD END.
What parts can replace RR5M12MILG3278?
There are 2 known substitutes for RR5M12MILG3278: RR5M12FS237, RR5M12. Substitute compatibility should be verified for your specific system.
What is the NSN for RR5M12MILG3278?
RR5M12MILG3278 is cataloged in the U.S. Government catalog under NSN 3110-00-293-8338. 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.