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Technical Data Sheet
PartsTable / COMPONENT / 21578-004
21578-004 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The HOUSING,BEARING UNIT is a the manufacturer industrial component. Key specifications include overall_length: 19.500 INCHES NOMINAL IN, input_current_rating: 30.0 AC AMPERES MINIMUM AND 35.0 AC AMPERES MAXIMUM SINGLE OPERATING POWER RQMT, input_voltage_rating: 208.0 AC VOLTS MINIMUM AND 240.0 AC VOLTS MAXIMUM SINGLE OPERATING POWER RQMT, output_current_rating: 120.0 DC AMPERES MINIMUM AND 180.0 DC AMPERES MAXIMUM SINGLE POWER OUTPUT, output_voltage_rating: 41.0 DC VOLTS MINIMUM AND 49.0 DC VOLTS MAXIMUM SINGLE POWER OUTPUT, end_item_identification: RIFLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-01-355-0962, 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
21578-004
NSN: 3130-01-355-0962
FSC: 3130
CAGE: 96151 — EATON CORPORATION DIV EATON FLUID POWER (USA)
SPECIFICATIONS
overall_length19.500 INCHES NOMINAL IN
input_current_rating30.0 AC AMPERES MINIMUM AND 35.0 AC AMPERES MAXIMUM SINGLE OPERATING POWER RQMT
input_voltage_rating208.0 AC VOLTS MINIMUM AND 240.0 AC VOLTS MAXIMUM SINGLE OPERATING POWER RQMT
output_current_rating120.0 DC AMPERES MINIMUM AND 180.0 DC AMPERES MAXIMUM SINGLE POWER OUTPUT
output_voltage_rating41.0 DC VOLTS MINIMUM AND 49.0 DC VOLTS MAXIMUM SINGLE POWER OUTPUT
end_item_identificationRIFLE
NSN3130-01-355-0962
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 21578-004 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
WE2145Interchangeable
interchangeable cross-reference
interchangeable
722809-5Interchangeable
interchangeable cross-reference
interchangeable
8537Interchangeable
interchangeable cross-reference
interchangeable
18-1075Interchangeable
interchangeable cross-reference
interchangeable
CAL3Interchangeable
interchangeable cross-reference
interchangeable
717299-028Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21578-004?
21578-004 is a HOUSING,BEARING UNIT.
What parts can replace 21578-004?
There are 13 known substitutes for 21578-004: WE2145, 722809-5, 8537 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21578-004?
21578-004 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-01-355-0962. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026