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3278370 — BEARING UNIT,PLAIN

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

3278370: BEARING UNIT,PLAIN.

The BEARING UNIT,PLAIN is a the manufacturer industrial component. Key specifications include housing_width: 1.7500 INCHES NOMINAL IN, alignment_type: RIGID, housing_height: 2.2500 INCHES NOMINAL IN, housing_length: 6.3750 INCHES NOMINAL IN, shaft_end_type: OPEN, mounting_hole_type: ROUND, UNTHREADED. This part is cataloged in the U.S.

Government catalog under NSN 3130-00-449-5291, 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
3278370
NSN: 3130-00-449-5291
FSC: 3130 — Bearings, Mounted
CAGE: 55380 — HATCH & KIRK, INC. (USA)
SPECIFICATIONS
housing_width1.7500 INCHES NOMINAL IN
alignment_typeRIGID
housing_height2.2500 INCHES NOMINAL IN
housing_length6.3750 INCHES NOMINAL IN
shaft_end_typeOPEN
mounting_hole_typeROUND, UNTHREADED
mounting_hole_diameter0.5000 INCHES NOMINAL IN
NSN3130-00-449-5291
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 3278370 · 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
•
HOUSING HEIGHT: 2.2500 INCHES NOMINAL IN
•
MOUNTING HOLE TYPE: ROUND, UNTHREADED
•
MOUNTING HOLE DIAMETER: 0.5000 INCHES NOMINAL IN
•
HOUSING WIDTH: 1.7500 INCHES NOMINAL IN
•
ALIGNMENT TYPE: RIGID
•
SHAFT END TYPE: OPEN
•
HOUSING LENGTH: 6.3750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HOUSING HEIGHT2.2500 INCHES NOMINAL IN
MOUNTING HOLE TYPEROUND, UNTHREADED
MOUNTING HOLE DIAMETER0.5000 INCHES NOMINAL IN
HOUSING WIDTH1.7500 INCHES NOMINAL IN
ALIGNMENT TYPERIGID
SHAFT END TYPEOPEN
HOUSING LENGTH6.3750 INCHES NOMINAL IN
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 3278370?
3278370 is a BEARING UNIT,PLAIN.
What is the NSN for 3278370?
3278370 is cataloged in the U.S. Government catalog under NSN 3130-00-449-5291. 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.