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10121B — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

10121B: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1010 OUTER LAYER, corner_shape: SQUARE ALL CORNERS, overall_length: 1.2190 INCHES MINIMUM AND 1.2500 INCHES MAXIMUM IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 1.1230 INCHES MINIMUM AND 1.1270 INCHES MAXIMUM IN, body_outside_diameter: 1.2510 INCHES MINIMUM AND 1.2530 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-384-8736, 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
10121B
NSN: 3120-00-384-8736
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 44185 — TLD WOLLARD LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OUTER LAYER
corner_shapeSQUARE ALL CORNERS
overall_length1.2190 INCHES MINIMUM AND 1.2500 INCHES MAXIMUM IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter1.1230 INCHES MINIMUM AND 1.1270 INCHES MAXIMUM IN
body_outside_diameter1.2510 INCHES MINIMUM AND 1.2530 INCHES MAXIMUM IN
NSN3120-00-384-8736
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 10121B · 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
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY OUTSIDE DIAMETER: 1.2510 INCHES MINIMUM AND 1.2530 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
BODY INSIDE DIAMETER: 1.1230 INCHES MINIMUM AND 1.1270 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 1010 OUTER LAYER
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER1.2510 INCHES MINIMUM AND 1.2530 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH1.2190 INCHES MINIMUM AND 1.2500 INCHES MAXIMUM IN
BODY INSIDE DIAMETER1.1230 INCHES MINIMUM AND 1.1270 INCHES MAXIMUM IN
MATERIALSTEEL COMP 1010 OUTER LAYER
MATERIALCOPPER ALLOY 614 INNER LAYER
MATERIALOIL LUBRICATING LUBRICATION
SUBSTITUTES & CROSS-REFERENCES 9
066013Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
166K1Reference document
Same NSN cross-reference
Reference document — Secondary reference
09-19334Reference document
Same NSN cross-reference
Reference document — Secondary reference
14016Reference document
Same NSN cross-reference
Reference document — Secondary reference
462-1862Reference document
Same NSN cross-reference
Reference document — Secondary reference
066024Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 10121B?
10121B is a BEARING,SLEEVE.
What parts can replace 10121B?
There are 9 known substitutes for 10121B: 066013, 166K1, 09-19334 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 10121B?
10121B is cataloged in the U.S. Government catalog under NSN 3120-00-384-8736. 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.