PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 8421539
8421539 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The BEARING UNIT,BALL is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seal_type: CONTACT, block_type: FIXED, base_length: 2.1000 INCHES MINIMUM AND 2.4000 INCHES MAXIMUM IN, bore_diameter: 1.9380 INCHES NOMINAL IN, housing_width: 7.7500 INCHES MINIMUM AND 8.1200 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-00-623-3022, 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
8421539
NSN: 3130-00-623-3022
FSC: 3130
CAGE: 19204 — ARMY, UNITED STATES DEPARTMENT OF THE DBA ROCK ISLAND ARSENAL JMTC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seal_typeCONTACT
block_typeFIXED
base_length2.1000 INCHES MINIMUM AND 2.4000 INCHES MAXIMUM IN
bore_diameter1.9380 INCHES NOMINAL IN
housing_width7.7500 INCHES MINIMUM AND 8.1200 INCHES MAXIMUM IN
seal_locationBOTH ENDS
alignment_typeSELF-ALIGNING
base_thickness1.3800 INCHES NOMINAL IN
housing_height4.5000 INCHES MINIMUM AND 4.6200 INCHES MAXIMUM IN
housing_length1.8300 INCHES MINIMUM AND 2.4700 INCHES MAXIMUM IN
shaft_end_typeOPEN
NSN3130-00-623-3022
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 8421539 · 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
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH: 6.2500 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: PILLOW BLOCK, SOLID
•
HOUSING HEIGHT: 4.5000 INCHES MINIMUM AND 4.6200 INCHES MAXIMUM IN
•
LUBRICATION FITTING ANGLE FROM HORIZONTAL CENTERLINE: 90.0 DEGREES NOMINAL
•
SHAFT END TYPE: OPEN
•
COLLAR LOCATION: ONE END
•
HOUSING WIDTH: 7.7500 INCHES MINIMUM AND 8.1200 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH6.2500 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
STYLE DESIGNATORPILLOW BLOCK, SOLID
HOUSING HEIGHT4.5000 INCHES MINIMUM AND 4.6200 INCHES MAXIMUM IN
LUBRICATION FITTING ANGLE FROM HORIZONTAL CENTERLINE90.0 DEGREES NOMINAL
SHAFT END TYPEOPEN
COLLAR LOCATIONONE END
HOUSING WIDTH7.7500 INCHES MINIMUM AND 8.1200 INCHES MAXIMUM IN
ASSEMBLY OVERALL LENGTH2.3700 INCHES MINIMUM AND 2.6700 INCHES MAXIMUM IN
LOAD CAPABILITY TYPERADIAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
657C0840Interchangeable
interchangeable cross-reference
interchangeable
A622Interchangeable
interchangeable cross-reference
interchangeable
SA1652-848Interchangeable
interchangeable cross-reference
interchangeable
BP3621Interchangeable
interchangeable cross-reference
interchangeable
78219Interchangeable
interchangeable cross-reference
interchangeable
227Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8421539?
8421539 is a BEARING UNIT,BALL.
What parts can replace 8421539?
There are 15 known substitutes for 8421539: 657C0840, A622, SA1652-848 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 8421539?
8421539 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-00-623-3022. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026