PartsTable
Technical Data Sheet
PartsTable / COMPONENT / C2866-4
C2866-4 ✓ 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 BEARING,PLAIN,SELF-ALIGNING is a the manufacturer industrial component. Key specifications include material: STEEL COMP E52100 INNER MEMBER, bore_diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, hardness_rating: 55.0 ROCKWELL C MINIMUM INNER MEMBER, style_designator: WITHOUT INSERT OR LINER, surface_treatment: CHROMIUM INNER MEMBER, inner_member_width: 0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM 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 3120-00-229-0285, 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
C2866-4
NSN: 3120-00-229-0285
FSC: 3120
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP E52100 INNER MEMBER
bore_diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
hardness_rating55.0 ROCKWELL C MINIMUM INNER MEMBER
style_designatorWITHOUT INSERT OR LINER
surface_treatmentCHROMIUM INNER MEMBER
inner_member_width0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
outer_member_width0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
static_radial_load_rating8400 POUNDS LBS
outer_member_outside_diameter0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
material_document_and_classificationMIL-G-21164 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
NSN3120-00-229-0285
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: C2866-4 · 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
KEY FEATURES
•
STATIC RADIAL LOAD RATING: 8400 POUNDS LBS
•
OUTER MEMBER OUTSIDE DIAMETER: 0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
•
INNER MEMBER WIDTH: 0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP E52100 INNER MEMBER
•
OUTER MEMBER WIDTH: 0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CHROMIUM INNER MEMBER
TECHNICAL CHARACTERISTICS (FLIS)
STATIC RADIAL LOAD RATING8400 POUNDS LBS
OUTER MEMBER OUTSIDE DIAMETER0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
INNER MEMBER WIDTH0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
MATERIALSTEEL COMP E52100 INNER MEMBER
OUTER MEMBER WIDTH0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
MATERIALSTEEL CORROSION RESISTING OUTER RACE MEMBER
MATERIALGREASE AND DISULFIDE MOLYBDENUM LUBRICATION
SURFACE TREATMENTCHROMIUM INNER MEMBER
STYLE DESIGNATORWITHOUT INSERT OR LINER
HARDNESS RATING55.0 ROCKWELL C MINIMUM INNER MEMBER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
55127Interchangeable
interchangeable cross-reference
interchangeable
A31555PC55127Interchangeable
interchangeable cross-reference
interchangeable
NG4Interchangeable
interchangeable cross-reference
interchangeable
919-012020Interchangeable
interchangeable cross-reference
interchangeable
919-012022Interchangeable
interchangeable cross-reference
interchangeable
2E-35127Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C2866-4?
C2866-4 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace C2866-4?
There are 7 known substitutes for C2866-4: 55127, A31555PC55127, NG4 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for C2866-4?
C2866-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-229-0285. 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