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2578520-001A — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

2578520-001A: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include overall_length: 2.4400 INCHES NOMINAL IN, surface_finish: 125.0 MICROINCHES OVERALL, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, INTERNAL FLANGE ONE END, body_inside_diameter: 5.0480 INCHES MINIMUM AND 5.0500 INCHES MAXIMUM IN, body_outside_diameter: 5.2150 INCHES MINIMUM AND 5.2260 INCHES MAXIMUM IN, left_internal_flange_width: 0.1700 INCHES MINIMUM AND 0.1750 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-451-5247, 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
2578520-001A
NSN: 3120-00-451-5247
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 15860 — NEW HAMPSHIRE BALL BEARINGS INC DIV ASTRO DIVISION (USA)
SPECIFICATIONS
overall_length2.4400 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES OVERALL
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES, INTERNAL FLANGE ONE END
body_inside_diameter5.0480 INCHES MINIMUM AND 5.0500 INCHES MAXIMUM IN
body_outside_diameter5.2150 INCHES MINIMUM AND 5.2260 INCHES MAXIMUM IN
left_internal_flange_width0.1700 INCHES MINIMUM AND 0.1750 INCHES MAXIMUM IN
left_internal_flange_hole_diameter4.7800 INCHES MINIMUM AND 4.7850 INCHES MAXIMUM IN
antirotation/lubrication_type_and_quantity2 HOLE
NSN3120-00-451-5247
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 2578520-001A · 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
•
LEFT INTERNAL FLANGE WIDTH: 0.1700 INCHES MINIMUM AND 0.1750 INCHES MAXIMUM IN
•
SURFACE FINISH: 125.0 MICROINCHES OVERALL
•
LEFT INTERNAL FLANGE HOLE DIAMETER: 4.7800 INCHES MINIMUM AND 4.7850 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 5.2150 INCHES MINIMUM AND 5.2260 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES, INTERNAL FLANGE ONE END
•
BODY INSIDE DIAMETER: 5.0480 INCHES MINIMUM AND 5.0500 INCHES MAXIMUM IN
•
ANTIROTATION/LUBRICATION TYPE AND QUANTITY: 2 HOLE
TECHNICAL CHARACTERISTICS
LEFT INTERNAL FLANGE WIDTH0.1700 INCHES MINIMUM AND 0.1750 INCHES MAXIMUM IN
SURFACE FINISH125.0 MICROINCHES OVERALL
LEFT INTERNAL FLANGE HOLE DIAMETER4.7800 INCHES MINIMUM AND 4.7850 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER5.2150 INCHES MINIMUM AND 5.2260 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES, INTERNAL FLANGE ONE END
OVERALL LENGTH2.4400 INCHES NOMINAL IN
BODY INSIDE DIAMETER5.0480 INCHES MINIMUM AND 5.0500 INCHES MAXIMUM IN
ANTIROTATION/LUBRICATION TYPE AND QUANTITY2 HOLE
TEST DATA DOCUMENT81349-MIL-I-6866 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
SUBSTITUTES & CROSS-REFERENCES 1
91032Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2578520-001A?
2578520-001A is a BEARING,SLEEVE.
What parts can replace 2578520-001A?
There is 1 known substitute for 2578520-001A: 91032. Substitute compatibility should be verified for your specific system.
What is the NSN for 2578520-001A?
2578520-001A is cataloged in the U.S. Government catalog under NSN 3120-00-451-5247. 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.