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MS21221-4 — BEARING,ROLLER,ROD END

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

MS21221-4: BEARING,ROLLER,ROD END.

The BEARING,ROLLER,ROD END is a the manufacturer industrial component. Key specifications include material: STEEL COMP E52100 ROLLER, shank_style: EXTERNALLY THREADED, thread_class: 3A A, bore_diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, alignment_type: SELF-ALIGNING, overall_length: 2.3700 INCHES MINIMUM AND 2.3900 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-01-368-2589, 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
MS21221-4
NSN: 3110-01-368-2589
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL COMP E52100 ROLLER
shank_styleEXTERNALLY THREADED
thread_class3A A
bore_diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
alignment_typeSELF-ALIGNING
overall_length2.3700 INCHES MINIMUM AND 2.3900 INCHES MAXIMUM IN
shank_diameter0.3750 INCHES MAXIMUM IN
inner_ring_width0.4950 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN
outer_ring_width0.3750 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM EXPOSED SURFACES AS MOUNTED
nominal_thread_size0.3750 INCHES IN
NSN3110-01-368-2589
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: MS21221-4 · 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: 0.3750 INCHES MAXIMUM IN
•
SHANK THREAD LENGTH: 0.9800 INCHES MINIMUM AND 1.0020 INCHES MAXIMUM IN
•
LUBRICATION MATERIAL: GREASE
•
OUTER RING WIDTH: 0.3750 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.3750 INCHES IN
•
SELF-ALIGNMENT ANGLE: 10.00 DEGREES NOMINAL
TECHNICAL CHARACTERISTICS
SHANK DIAMETER0.3750 INCHES MAXIMUM IN
SHANK THREAD LENGTH0.9800 INCHES MINIMUM AND 1.0020 INCHES MAXIMUM IN
LUBRICATION MATERIALGREASE
OUTER RING WIDTH0.3750 INCHES MAXIMUM IN
OVERALL LENGTH2.3700 INCHES MINIMUM AND 2.3900 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.3750 INCHES IN
SELF-ALIGNMENT ANGLE10.00 DEGREES NOMINAL
SHANK STYLEEXTERNALLY THREADED
ALIGNMENT TYPESELF-ALIGNING
SUBSTITUTES & CROSS-REFERENCES 2
AS21221Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS8952Reference document
Same NSN cross-reference
Reference document — Secondary 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 MS21221-4?
MS21221-4 is a BEARING,ROLLER,ROD END.
What parts can replace MS21221-4?
There are 2 known substitutes for MS21221-4: AS21221, AS8952. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21221-4?
MS21221-4 is cataloged in the U.S. Government catalog under NSN 3110-01-368-2589. This indicates validated use in U.S. government and defense supply chains.
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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.