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AT21139 — BEARING,WASHER,THRUST

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

AT21139: BEARING,WASHER,THRUST.

The BEARING,WASHER,THRUST is a the manufacturer industrial component. Key specifications include overall_length: 1.5290 INCHES NOMINAL IN, special_features: 0.0020 IN. UNDERSIZE BORE; LUBRICATION PROVISIONS TO MEET ENGINE MANUFACTURERS SPECIFICATIONS IN, style_designator: SEGMENTED, EXTERNAL FLANGES BOTH ENDS, surface_treatment: TIN OVERALL, body_inside_diameter: 3.1250 INCHES NOMINAL IN, body_outside_diameter: 3.3255 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 3120-00-202-0837, 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
AT21139
NSN: 3120-00-202-0837
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 75160 — DEERE & CO (USA)
SPECIFICATIONS
overall_length1.5290 INCHES NOMINAL IN
special_features0.0020 IN. UNDERSIZE BORE; LUBRICATION PROVISIONS TO MEET ENGINE MANUFACTURERS SPECIFICATIONS IN
style_designatorSEGMENTED, EXTERNAL FLANGES BOTH ENDS
surface_treatmentTIN OVERALL
body_inside_diameter3.1250 INCHES NOMINAL IN
body_outside_diameter3.3255 INCHES NOMINAL IN
NSN3120-00-202-0837
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: AT21139 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
SUBSTITUTES & CROSS-REFERENCES 1
223727Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 AT21139?
AT21139 is a BEARING,WASHER,THRUST.
What parts can replace AT21139?
There is 1 known substitute for AT21139: 223727. Substitute compatibility should be verified for your specific system.
What is the NSN for AT21139?
AT21139 is cataloged in the U.S. Government catalog under NSN 3120-00-202-0837. 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.