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Technical Data Sheet
PartsTable / COMPONENT / 51644A
51644A ✓ 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,WASHER,THRUST is a the manufacturer industrial component. Key specifications include diameter: 4.2500 INCHES NOMINAL IN, material: TIN INNER LAYER, corner_shape: SQUARE ALL CORNERS, outside_diameter: 6.6120 INCHES MINIMUM AND 6.6160 INCHES MAXIMUM IN, style_designator: ROUND, overall_thickness: 0.4950 INCHES MINIMUM AND 0.4970 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 3120-00-330-9941, 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
51644A
NSN: 3120-00-330-9941
FSC: 3120
CAGE: 82423 — KLEINSCHMIDT INC (USA)
SPECIFICATIONS
diameter4.2500 INCHES NOMINAL IN
materialTIN INNER LAYER
corner_shapeSQUARE ALL CORNERS
outside_diameter6.6120 INCHES MINIMUM AND 6.6160 INCHES MAXIMUM IN
style_designatorROUND
overall_thickness0.4950 INCHES MINIMUM AND 0.4970 INCHES MAXIMUM IN
lubrication_featureGROOVE FLAT BEARING SURFACE
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN3120-00-330-9941
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 51644A · 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
•
COMPONENT QUANTITY: 6
TECHNICAL CHARACTERISTICS (FLIS)
COMPONENT QUANTITY6
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
35360080Interchangeable
interchangeable cross-reference
interchangeable
65A0578-2Interchangeable
interchangeable cross-reference
interchangeable
5001/9Interchangeable
interchangeable cross-reference
interchangeable
2868324-1Interchangeable
interchangeable cross-reference
interchangeable
50019Interchangeable
interchangeable cross-reference
interchangeable
6600183Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51644A?
51644A is a BEARING,WASHER,THRUST.
What parts can replace 51644A?
There are 15 known substitutes for 51644A: 35360080, 65A0578-2, 5001/9 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51644A?
51644A is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-330-9941. 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