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4X728 — BEARING UNIT,BALL

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

4X728: BEARING UNIT,BALL.

The BEARING UNIT,BALL is a the manufacturer industrial component. Key specifications include material: STEEL HOUSING, bore_diameter: 0.6250 INCHES NOMINAL IN, special_features: INAVY: MOUNTED BALL BEARING, end_item_identification: VAPOR CYCLE; HAWKEYE E-2C AIRCRAFT.. This part is cataloged in the U.S.

Government catalog under NSN 3130-01-522-0638, 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
4X728
NSN: 3130-01-522-0638
FSC: 3130 — Bearings, Mounted
CAGE: 25795 — W.W. GRAINGER, INC. DIV GOVERNMENT SALES DIVISION (USA)
SPECIFICATIONS
materialSTEEL HOUSING
bore_diameter0.6250 INCHES NOMINAL IN
special_featuresINAVY: MOUNTED BALL BEARING
end_item_identificationVAPOR CYCLE; HAWKEYE E-2C AIRCRAFT.
NSN3130-01-522-0638
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 4X728 · 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
•
BORE DIAMETER: 0.6250 INCHES NOMINAL IN
•
MATERIAL: STEEL HOUSING
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESINAVY: MOUNTED BALL BEARING
END ITEM IDENTIFICATIONVAPOR CYCLE; HAWKEYE E-2C AIRCRAFT.
BORE DIAMETER0.6250 INCHES NOMINAL IN
MATERIALSTEEL HOUSING
OTHER ITEMS IN FSC 3130 — Bearings, Mounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3130-00-001-5118 3130-00-001-5137 3130-00-001-6585 3130-00-003-0422 3130-00-003-0455 3130-00-003-0794 3130-00-003-2802 3130-00-003-9535
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 4X728?
4X728 is a BEARING UNIT,BALL.
What is the NSN for 4X728?
4X728 is cataloged in the U.S. Government catalog under NSN 3130-01-522-0638. 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.