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A4121 — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

A4121: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, center_hole_diameter: 2.090 INCHES MINIMUM AND 2.110 INCHES MAXIMUM IN, cross-sectional_height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-612-2833, 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
A4121
NSN: 3120-00-612-2833
NIINs: 006122833, 007645311
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 0BR59 — SIEMENS GOVERNMENT TECHNOLOGIES, INC. DBA SGT DRESSER-RAND DIV SGT DRESSER-RAND (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
center_hole_diameter2.090 INCHES MINIMUM AND 2.110 INCHES MAXIMUM IN
cross-sectional_height0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
NSN3120-00-612-2833
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: A4121 · 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
KEY FEATURES
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SURFACE FINISH: 125.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
•
CORNER SHAPE: SQUARE ALL CORNERS
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BODY OUTSIDE DIAMETER: 1.0015 INCHES MINIMUM AND 1.0018 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
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BODY INSIDE DIAMETER: 0.7460 INCHES MINIMUM AND 0.7470 INCHES MAXIMUM IN
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LUBRICANT ACCOMMODATION STYLE: GROOVED OPEN BOTH ENDS
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH125.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER1.0015 INCHES MINIMUM AND 1.0018 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH1.0000 INCHES NOMINAL IN
BODY INSIDE DIAMETER0.7460 INCHES MINIMUM AND 0.7470 INCHES MAXIMUM IN
LUBRICANT ACCOMMODATION STYLEGROOVED OPEN BOTH ENDS
MATERIALCOPPER ALLOY OVERALL
SURFACE GROOVE LOCATION AND QUANTITY1 INTERNAL
SUBSTITUTES & CROSS-REFERENCES 1
130061Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 A4121?
A4121 is a BEARING,SLEEVE.
What parts can replace A4121?
There is 1 known substitute for A4121: 130061. Substitute compatibility should be verified for your specific system.
What is the NSN for A4121?
A4121 is cataloged in the U.S. Government catalog under NSN 3120-00-612-2833. 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.