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Technical Data Sheet
PartsTable / COMPONENT / LS-4
LS-4 ✓ 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 LOUDSPEAKER ASSEMBLY is a the manufacturer industrial component. Key specifications include material: STEEL INNER MEMBER, baby_seat: NOT PROVIDED, network_type: CROSSOVER, usage_design: INDOOR OR OUTDOOR, bore_diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, hinged_basket: NOT INCLUDED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-426-2739, 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
LS-4
NSN: 3120-00-426-2739
FSC: 3120
CAGE: 73134 — ROLLER BEARING COMPANY OF AMERICA, INC. (USA)
SPECIFICATIONS
materialSTEEL INNER MEMBER
baby_seatNOT PROVIDED
network_typeCROSSOVER
usage_designINDOOR OR OUTDOOR
bore_diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
hinged_basketNOT INCLUDED
mounting_typeCABINET
overall_width13.000 INCHES NOMINAL IN
overall_height12.000 INCHES NOMINAL IN
overall_length24.000 INCHES NOMINAL IN
basket_quantity2
nesting_featureNOT INCLUDED
NSN3120-00-426-2739
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: LS-4 · 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
SCD2239Interchangeable
interchangeable cross-reference
interchangeable
A65221-4Interchangeable
interchangeable cross-reference
interchangeable
S4Interchangeable
interchangeable cross-reference
interchangeable
A-A-55472Interchangeable
interchangeable cross-reference
interchangeable
AA55472-20Interchangeable
interchangeable cross-reference
interchangeable
54514Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is LS-4?
LS-4 is a LOUDSPEAKER ASSEMBLY.
What parts can replace LS-4?
There are 13 known substitutes for LS-4: SCD2239, A65221-4, S4 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for LS-4?
LS-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-426-2739. 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