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Technical Data Sheet
PartsTable / COMPONENT / 57C240
57C240 ✓ 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 HALF,SLEEVE is a the manufacturer industrial component. Key specifications include material: TIN ALLOY INNER LAYER, corner_shape: SQUARE ALL CORNERS, hole_diameter: 0.1875 INCHES NOMINAL FIRST IN, overall_length: 0.9780 INCHES NOMINAL IN, style_designator: HALF SLEEVE, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 1.1254 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-661-8645, 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
57C240
NSN: 3120-00-661-8645
FSC: 3120
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialTIN ALLOY INNER LAYER
corner_shapeSQUARE ALL CORNERS
hole_diameter0.1875 INCHES NOMINAL FIRST IN
overall_length0.9780 INCHES NOMINAL IN
style_designatorHALF SLEEVE, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter1.1254 INCHES NOMINAL IN
body_outside_diameter1.2500 INCHES NOMINAL IN
antirotation/lubrication_type_and_quantity1 HOLE
NSN3120-00-661-8645
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 57C240 · 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: HALF SLEEVE, PLAIN, NO OUTSIDE FLANGES
•
MATERIAL: STEEL OUTER LAYER
•
BODY INSIDE DIAMETER: 1.1254 INCHES NOMINAL IN
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY OUTSIDE DIAMETER: 1.2500 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.1875 INCHES NOMINAL FIRST IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH0.9780 INCHES NOMINAL IN
STYLE DESIGNATORHALF SLEEVE, PLAIN, NO OUTSIDE FLANGES
MATERIALSTEEL OUTER LAYER
BODY INSIDE DIAMETER1.1254 INCHES NOMINAL IN
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER1.2500 INCHES NOMINAL IN
HOLE DIAMETER0.1875 INCHES NOMINAL FIRST IN
MATERIALTIN ALLOY INNER LAYER
ANTIROTATION/LUBRICATION TYPE AND QUANTITY1 HOLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
639847Interchangeable
interchangeable cross-reference
interchangeable
1107C29Interchangeable
interchangeable cross-reference
interchangeable
11EHT171Interchangeable
interchangeable cross-reference
interchangeable
1726-0750Interchangeable
interchangeable cross-reference
interchangeable
TABLE 61,D 3/4INInterchangeable
interchangeable cross-reference
interchangeable
D-681Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 57C240?
57C240 is a BEARING HALF,SLEEVE.
What parts can replace 57C240?
There are 19 known substitutes for 57C240: 639847, 1107C29, 11EHT171 and 16 more. Substitute compatibility should be verified for your specific system.
Is 57C240 still available?
57C240 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