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Technical Data Sheet
PartsTable / COMPONENT / FF312
FF312 ✓ 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

RESISTOR,FIXED,WIRE WOUND,INDUCT. Key specifications include material: COPPER ALLOY OVERALL, corner_shape: SQUARE LEFT FLANGE OUTSIDE RIGHT CORNER, flange_width: 0.0600 INCHES MINIMUM AND 0.0650 INCHES MAXIMUM IN, overall_length: 0.2500 INCHES NOMINAL IN, special_features: BEARING IS LUBRICANT IMPREGNATED, style_designator: SOLID, EXTERNAL FLANGE ONE END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-517-0078, 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
FF312
NSN: 3120-00-517-0078
FSC: 3120
CAGE: 02254 — MASTEN BUNTING EAGLE-PICHER BEARINGS DIV EAGLE-PICHER INDUSTRIES INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
corner_shapeSQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
flange_width0.0600 INCHES MINIMUM AND 0.0650 INCHES MAXIMUM IN
overall_length0.2500 INCHES NOMINAL IN
special_featuresBEARING IS LUBRICANT IMPREGNATED
style_designatorSOLID, EXTERNAL FLANGE ONE END
body_inside_diameter0.2510 INCHES MINIMUM AND 0.2520 INCHES MAXIMUM IN
body_outside_diameter0.3725 INCHES MINIMUM AND 0.3775 INCHES MAXIMUM IN
flange_outside_diameter0.4662 INCHES MINIMUM AND 0.4712 INCHES MAXIMUM IN
nondefinitive_spec/std_data1 TYPE AND A COMPOSITION
material_document_and_classificationMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN3120-00-517-0078
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: FF312 · 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
•
MATERIAL: OIL LUBRICATING LUBRICATION
•
CORNER SHAPE: SQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
FLANGE OUTSIDE DIAMETER: 0.4630 INCHES MINIMUM AND 0.4730 INCHES MAXIMUM IN
•
FLANGE WIDTH: 0.0600 INCHES MINIMUM AND 0.0650 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALOIL LUBRICATING LUBRICATION
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CORNER SHAPESQUARE LEFT FLANGE BODY CORNER
FLANGE OUTSIDE DIAMETER0.4630 INCHES MINIMUM AND 0.4730 INCHES MAXIMUM IN
FLANGE WIDTH0.0600 INCHES MINIMUM AND 0.0650 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-L-6085 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
CORNER SHAPESQUARE INSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
F312Interchangeable
interchangeable cross-reference
interchangeable
FF312Interchangeable
interchangeable cross-reference
interchangeable
MILB5687Interchangeable
interchangeable cross-reference
interchangeable
F312MILL6085Interchangeable
Same NIIN cross-reference
interchangeable
65A81-826Interchangeable
Same NIIN cross-reference
interchangeable
CF252B0250Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF312?
FF312 is a RESISTOR,FIXED,WIRE WOUND,INDUCT.
What parts can replace FF312?
There are 7 known substitutes for FF312: F312, FF312, MILB5687 and 4 more. Substitute compatibility should be verified for your specific system.
Is FF312 still available?
FF312 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