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Technical Data Sheet

55204&1 — BEARING UNIT,BALL

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

55204&1: BEARING UNIT,BALL.

The BEARING UNIT,BALL is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, block_type: FIXED, base_length: 1.8750 INCHES NOMINAL IN, bore_diameter: 1.3750 INCHES NOMINAL IN, housing_width: 6.5625 INCHES NOMINAL IN, base_thickness: 0.7500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3130-01-003-3311, 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
55204&1
NSN: 3130-01-003-3311
FSC: 3130 — Bearings, Mounted
CAGE: 94833 — KECO INDUSTRIES, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
block_typeFIXED
base_length1.8750 INCHES NOMINAL IN
bore_diameter1.3750 INCHES NOMINAL IN
housing_width6.5625 INCHES NOMINAL IN
base_thickness0.7500 INCHES NOMINAL IN
housing_height3.6250 INCHES NOMINAL IN
shaft_end_typeOPEN
style_designatorPILLOW BLOCK, SOLID
mounting_hole_typeROUND, UNTHREADED
lubrication_materialGREASE
mounting_hole_diameter0.7500 INCHES NOMINAL IN
NSN3130-01-003-3311
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 55204&1 · 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
•
LUBRICATION MATERIAL: GREASE
•
ASSEMBLY OVERALL LENGTH: 2.0156 INCHES NOMINAL IN
•
HOUSING HEIGHT: 3.6250 INCHES NOMINAL IN
•
MOUNTING HOLE TYPE: ROUND, UNTHREADED
•
BLOCK TYPE: FIXED
•
STYLE DESIGNATOR: PILLOW BLOCK, SOLID
•
MOUNTING HOLE DIAMETER: 0.7500 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH: 5.0000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
LUBRICATION MATERIALGREASE
ASSEMBLY OVERALL LENGTH2.0156 INCHES NOMINAL IN
HOUSING HEIGHT3.6250 INCHES NOMINAL IN
MOUNTING HOLE TYPEROUND, UNTHREADED
BLOCK TYPEFIXED
STYLE DESIGNATORPILLOW BLOCK, SOLID
MOUNTING HOLE DIAMETER0.7500 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH5.0000 INCHES NOMINAL IN
HOUSING WIDTH6.5625 INCHES NOMINAL IN
BASE LENGTH1.8750 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 55204&1?
55204&1 is a BEARING UNIT,BALL.
What is the NSN for 55204&1?
55204&1 is cataloged in the U.S. Government catalog under NSN 3130-01-003-3311. 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.