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Technical Data Sheet
PartsTable / COMPONENT / PRB4
PRB4 ✓ 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 BEARING,PLAIN,SELF-ALIGNING is a the manufacturer industrial component. Key specifications include material: STEEL INNER MEMBER, bore_diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, style_designator: WITHOUT INSERT OR LINER, surface_treatment: CADMIUM OUTER RACE MEMBER, inner_member_width: 0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN, outer_member_width: 0.2450 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-661-7138, 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
PRB4
NSN: 3120-00-661-7138
FSC: 3120
CAGE: 99528 — RADIAL BEARING CORPORATION DBA RADIAL BEARING CORP OF CONNECTICU DIV RADIAL BEARING LLC (USA)
SPECIFICATIONS
materialSTEEL INNER MEMBER
bore_diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
style_designatorWITHOUT INSERT OR LINER
surface_treatmentCADMIUM OUTER RACE MEMBER
inner_member_width0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
outer_member_width0.2450 INCHES NOMINAL IN
lubrication_featureGROOVE EXTERNAL OUTER MEMBER
outer_member_outside_diameter0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
NSN3120-00-661-7138
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: PRB4 · 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
•
BORE DIAMETER: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY OUTER RACE MEMBER
•
STYLE DESIGNATOR: WITHOUT INSERT OR LINER
•
SURFACE TREATMENT: CADMIUM OUTER RACE MEMBER
•
LUBRICATION FEATURE: GROOVE EXTERNAL OUTER MEMBER
•
OUTER MEMBER WIDTH: 0.2450 INCHES NOMINAL IN
•
INNER MEMBER WIDTH: 0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
BORE DIAMETER0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY OUTER RACE MEMBER
STYLE DESIGNATORWITHOUT INSERT OR LINER
SURFACE TREATMENTCADMIUM OUTER RACE MEMBER
LUBRICATION FEATUREGROOVE EXTERNAL OUTER MEMBER
MATERIALSTEEL INNER MEMBER
OUTER MEMBER WIDTH0.2450 INCHES NOMINAL IN
INNER MEMBER WIDTH0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
OUTER MEMBER OUTSIDE DIAMETER0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
KSBG4Interchangeable
interchangeable cross-reference
interchangeable
3120PL2022075Interchangeable
interchangeable cross-reference
interchangeable
RB-4Interchangeable
interchangeable cross-reference
interchangeable
0404LInterchangeable
Same NIIN cross-reference
interchangeable
4M71A4GInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is PRB4?
PRB4 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace PRB4?
There are 5 known substitutes for PRB4: KSBG4, 3120PL2022075, RB-4 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for PRB4?
PRB4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-661-7138. 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