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1020C0521 — HOUSING,BEARING UNIT

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

1020C0521: HOUSING,BEARING UNIT.

The HOUSING,BEARING UNIT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 356.0 OVERALL, base_length: 0.4400 INCHES NOMINAL IN, bore_diameter: 0.6257 INCHES MINIMUM AND 0.6262 INCHES MAXIMUM IN, base_thickness: 0.2500 INCHES NOMINAL IN, housing_height: 0.9550 INCHES NOMINAL IN, shaft_end_type: OPEN. This part is cataloged in the U.S.

Government catalog under NSN 3130-01-004-5101, 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
1020C0521
NSN: 3130-01-004-5101
FSC: 3130 — Bearings, Mounted
CAGE: 03538 — LOCKHEED MARTIN CORPORATION DIV RMS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 356.0 OVERALL
base_length0.4400 INCHES NOMINAL IN
bore_diameter0.6257 INCHES MINIMUM AND 0.6262 INCHES MAXIMUM IN
base_thickness0.2500 INCHES NOMINAL IN
housing_height0.9550 INCHES NOMINAL IN
shaft_end_typeOPEN
mounting_hole_typeROUND, UNTHREADED
mounting_hole_diameter0.2010 INCHES NOMINAL IN
material_document_and_classificationQQ-A-601 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
height_from_bottom_of_base_to_bore_centerline0.5150 INCHES MINIMUM AND 0.5170 INCHES MAXIMUM IN
center_to_center_distance_between_mounting_holes_along_width1.0600 INCHES NOMINAL IN
NSN3130-01-004-5101
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 1020C0521 · 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: 0.9550 INCHES NOMINAL IN
•
MOUNTING HOLE TYPE: ROUND, UNTHREADED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-601 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MOUNTING HOLE DIAMETER: 0.2010 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH: 1.0600 INCHES NOMINAL IN
•
BASE LENGTH: 0.4400 INCHES NOMINAL IN
•
SHAFT END TYPE: OPEN
•
BASE THICKNESS: 0.2500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HOUSING HEIGHT0.9550 INCHES NOMINAL IN
MOUNTING HOLE TYPEROUND, UNTHREADED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-601 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MOUNTING HOLE DIAMETER0.2010 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES ALONG WIDTH1.0600 INCHES NOMINAL IN
BASE LENGTH0.4400 INCHES NOMINAL IN
SHAFT END TYPEOPEN
BASE THICKNESS0.2500 INCHES NOMINAL IN
BORE DIAMETER0.6257 INCHES MINIMUM AND 0.6262 INCHES MAXIMUM IN
MATERIALALUMINUM ALLOY 356.0 OVERALL
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 1020C0521?
1020C0521 is a HOUSING,BEARING UNIT.
What is the NSN for 1020C0521?
1020C0521 is cataloged in the U.S. Government catalog under NSN 3130-01-004-5101. 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.