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4D99521H02 — BEARING,WASHER,THRUST

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

4D99521H02: BEARING,WASHER,THRUST.

The BEARING,WASHER,THRUST is a the manufacturer industrial component. Key specifications include diameter: 4.0100 INCHES NOMINAL IN, material: ALUMINUM ALLOY AND COPPER ALLOY AND NICKEL ALLOY OVERALL, corner_shape: ROUND ALL CORNERS, outside_diameter: 4.7500 INCHES NOMINAL IN, style_designator: ROUND, overall_thickness: 2.5500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-01-520-9641, 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
4D99521H02
NSN: 3120-01-520-9641
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 04808 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DIV CURTISS-WRIGHT EMD (USA)
SPECIFICATIONS
diameter4.0100 INCHES NOMINAL IN
materialALUMINUM ALLOY AND COPPER ALLOY AND NICKEL ALLOY OVERALL
corner_shapeROUND ALL CORNERS
outside_diameter4.7500 INCHES NOMINAL IN
style_designatorROUND
overall_thickness2.5500 INCHES NOMINAL IN
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN3120-01-520-9641
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 4D99521H02 · 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: ROUND ALL CORNERS
•
OVERALL THICKNESS: 2.5500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ROUND
•
DIAMETER: 4.0100 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OUTSIDE DIAMETER: 4.7500 INCHES NOMINAL IN
•
MATERIAL: ALUMINUM ALLOY AND COPPER ALLOY AND NICKEL ALLOY OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
CORNER SHAPEROUND ALL CORNERS
OVERALL THICKNESS2.5500 INCHES NOMINAL IN
STYLE DESIGNATORROUND
DIAMETER4.0100 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OUTSIDE DIAMETER4.7500 INCHES NOMINAL IN
MATERIALALUMINUM ALLOY AND COPPER ALLOY AND NICKEL ALLOY OVERALL
CENTER HOLE SHAPE STYLEROUND
OTHER ITEMS IN FSC 3120 — Bearings, Plain, Unmounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3120-00-001-1288 3120-00-001-1835 3120-00-001-1838 3120-00-001-1928 3120-00-001-1934 3120-00-001-3933 3120-00-001-3937 3120-00-001-3938
SUBSTITUTES & CROSS-REFERENCES 1
4D99141 ITEM 21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 4D99521H02?
4D99521H02 is a BEARING,WASHER,THRUST.
What parts can replace 4D99521H02?
There is 1 known substitute for 4D99521H02: 4D99141 ITEM 21. Substitute compatibility should be verified for your specific system.
What is the NSN for 4D99521H02?
4D99521H02 is cataloged in the U.S. Government catalog under NSN 3120-01-520-9641. 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.