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Technical Data Sheet
PartsTable / COMPONENT / BLFN4-318-2
BLFN4-318-2 ✓ 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 630 OUTER RACE MEMBER, bore_diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, hardness_rating: 23.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER, style_designator: WITH INSERT AND/OR LINER, inner_member_width: 0.3410 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN, outer_member_width: 0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-528-5336, 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
BLFN4-318-2
NSN: 3120-00-528-5336
FSC: 3120
CAGE: 81376 — RBC SOUTHWEST PRODUCTS, INC. (USA)
SPECIFICATIONS
materialSTEEL COMP 630 OUTER RACE MEMBER
bore_diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
hardness_rating23.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
style_designatorWITH INSERT AND/OR LINER
inner_member_width0.3410 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
outer_member_width0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
static_radial_load_rating6040 POUNDS LBS
outer_member_outside_diameter0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
NSN3120-00-528-5336
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: BLFN4-318-2 · 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
•
STYLE DESIGNATOR: WITH INSERT AND/OR LINER
•
MATERIAL: STEEL COMP 630 OUTER RACE MEMBER
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
•
INNER MEMBER WIDTH: 0.3410 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
•
OUTER MEMBER OUTSIDE DIAMETER: 0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORWITH INSERT AND/OR LINER
MATERIALSTEEL COMP 630 OUTER RACE MEMBER
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE RACE LINER
MATERIALSTEEL COMP 440C INNER MEMBER
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER
INNER MEMBER WIDTH0.3410 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
HARDNESS RATING55.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM INNER MEMBER
OUTER MEMBER OUTSIDE DIAMETER0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
OUTER MEMBER WIDTH0.2450 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
STATIC RADIAL LOAD RATING6040 POUNDS LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
HT4Interchangeable
interchangeable cross-reference
interchangeable
STABONDHT4Interchangeable
interchangeable cross-reference
interchangeable
NAS77Interchangeable
interchangeable cross-reference
interchangeable
AS14104Interchangeable
interchangeable cross-reference
interchangeable
NAS77-6-020Interchangeable
interchangeable cross-reference
interchangeable
KR10-CNGBInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BLFN4-318-2?
BLFN4-318-2 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace BLFN4-318-2?
There are 25 known substitutes for BLFN4-318-2: HT4, STABONDHT4, NAS77 and 22 more. Substitute compatibility should be verified for your specific system.
Is BLFN4-318-2 still available?
BLFN4-318-2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026