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B365-4-021 — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

B365-4-021: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 630 OR STEEL COMP 321 OVERALL, overall_length: 0.2050 INCHES MINIMUM AND 0.2100 INCHES MAXIMUM IN, body_inside_diameter: 0.2500 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN, body_outside_diameter: 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-01-259-9571, 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
B365-4-021
NSN: 3120-01-259-9571
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 15860 — NEW HAMPSHIRE BALL BEARINGS INC DIV ASTRO DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 630 OR STEEL COMP 321 OVERALL
overall_length0.2050 INCHES MINIMUM AND 0.2100 INCHES MAXIMUM IN
body_inside_diameter0.2500 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
body_outside_diameter0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN
NSN3120-01-259-9571
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: B365-4-021 · 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
•
BODY OUTSIDE DIAMETER: 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN
•
BODY INSIDE DIAMETER: 0.2500 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 630 OR STEEL COMP 321 OVERALL
TECHNICAL CHARACTERISTICS
BODY OUTSIDE DIAMETER0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN
OVERALL LENGTH0.2050 INCHES MINIMUM AND 0.2100 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.2500 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
MATERIALSTEEL COMP 630 OR STEEL COMP 321 OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
GL519A4-021Reference document
Same NSN cross-reference
Reference document — Vendor item drawing 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 B365-4-021?
B365-4-021 is a BEARING,SLEEVE.
What parts can replace B365-4-021?
There is 1 known substitute for B365-4-021: GL519A4-021. Substitute compatibility should be verified for your specific system.
What is the NSN for B365-4-021?
B365-4-021 is cataloged in the U.S. Government catalog under NSN 3120-01-259-9571. 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.