PartsTable
Technical Data Sheet
PartsTable / COMPONENT / FF520-5
FF520-5 ✓ 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,SLEEVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, corner_shape: SQUARE OUTSIDE LEFT CORNER, flange_width: 0.0605 INCHES MINIMUM AND 0.0645 INCHES MAXIMUM IN, overall_length: 0.4950 INCHES MINIMUM AND 0.5050 INCHES MAXIMUM IN, style_designator: SOLID, EXTERNAL FLANGE ONE END, body_inside_diameter: 0.3755 INCHES MINIMUM AND 0.3765 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-781-7303, 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
FF520-5
NSN: 3120-00-781-7303
FSC: 3120
CAGE: 70417 — CHRYSLER CORP AMPLEX DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
corner_shapeSQUARE OUTSIDE LEFT CORNER
flange_width0.0605 INCHES MINIMUM AND 0.0645 INCHES MAXIMUM IN
overall_length0.4950 INCHES MINIMUM AND 0.5050 INCHES MAXIMUM IN
style_designatorSOLID, EXTERNAL FLANGE ONE END
body_inside_diameter0.3755 INCHES MINIMUM AND 0.3765 INCHES MAXIMUM IN
body_outside_diameter0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
flange_outside_diameter0.6200 INCHES MINIMUM AND 0.6300 INCHES MAXIMUM IN
material_document_and_classificationMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN3120-00-781-7303
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: FF520-5 · 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
•
BODY INSIDE DIAMETER: 0.3755 INCHES MINIMUM AND 0.3765 INCHES MAXIMUM IN
•
CORNER SHAPE: SQUARE INSIDE LEFT CORNER
•
BODY OUTSIDE DIAMETER: 0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, EXTERNAL FLANGE ONE END
•
FLANGE OUTSIDE DIAMETER: 0.6200 INCHES MINIMUM AND 0.6300 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY INSIDE DIAMETER0.3755 INCHES MINIMUM AND 0.3765 INCHES MAXIMUM IN
CORNER SHAPESQUARE INSIDE LEFT CORNER
OVERALL LENGTH0.4950 INCHES MINIMUM AND 0.5050 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.5010 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
FLANGE OUTSIDE DIAMETER0.6200 INCHES MINIMUM AND 0.6300 INCHES MAXIMUM IN
FLANGE WIDTH0.0605 INCHES MINIMUM AND 0.0645 INCHES MAXIMUM IN
CORNER SHAPESQUARE INSIDE RIGHT CORNER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
B743Interchangeable
interchangeable cross-reference
interchangeable
217Interchangeable
interchangeable cross-reference
interchangeable
B1119Interchangeable
interchangeable cross-reference
interchangeable
6954Interchangeable
interchangeable cross-reference
interchangeable
B74.13Interchangeable
interchangeable cross-reference
interchangeable
B7.1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF520-5?
FF520-5 is a BEARING,SLEEVE.
What parts can replace FF520-5?
There are 13 known substitutes for FF520-5: B743, 217, B1119 and 10 more. Substitute compatibility should be verified for your specific system.
Is FF520-5 still available?
FF520-5 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