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518309-8 — BEARING UNIT,BALL

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

518309-8: BEARING UNIT,BALL.

The BEARING UNIT,BALL is a the manufacturer industrial component. Key specifications include general_characteristics_item_description: INSTALLED ON 1.950 IN. DIA FLANGED TUBE IN.

This part is cataloged in the U.S. Government catalog under NSN 3130-00-839-1458, 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
518309-8
NSN: 3130-00-839-1458
NIINs: 008391458, 010554126
FSC: 3130 — Bearings, Mounted
CAGE: 22525 — INSTRUMENTS AND FLIGHT RESEARCH, INC. (USA)
SPECIFICATIONS
general_characteristics_item_descriptionINSTALLED ON 1.950 IN. DIA FLANGED TUBE IN
NSN3130-00-839-1458
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 518309-8 · 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
•
SEAL TYPE: CONTACT
•
LUBRICATION FITTING TYPE: SELF LUBRICATED
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
MOUNTING HOLE TYPE: ROUND, UNTHREADED
•
ROTATING ELEMENT LOCKING METHOD: DIRECT
•
SEAL LOCATION: ONE END
•
BLOCK TYPE: FIXED
•
STYLE DESIGNATOR: CYLINDRICAL CARTRIDGE
TECHNICAL CHARACTERISTICS
SEAL TYPECONTACT
LUBRICATION FITTING TYPESELF LUBRICATED
INTERNAL FIT-UP DESIGNATIONSTANDARD
MOUNTING HOLE TYPEROUND, UNTHREADED
ROTATING ELEMENT LOCKING METHODDIRECT
SEAL LOCATIONONE END
BLOCK TYPEFIXED
STYLE DESIGNATORCYLINDRICAL CARTRIDGE
MOUNTING HOLE DIAMETER0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
FEATURES PROVIDEDGROUND ROLLING ELEMENT GROOVE
SUBSTITUTES & CROSS-REFERENCES 2
MPK6-8Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
RVBC2S1500-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 518309-8?
518309-8 is a BEARING UNIT,BALL.
What parts can replace 518309-8?
There are 2 known substitutes for 518309-8: MPK6-8, RVBC2S1500-8. Substitute compatibility should be verified for your specific system.
What is the NSN for 518309-8?
518309-8 is cataloged in the U.S. Government catalog under NSN 3130-00-839-1458. 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.