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668K1 — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

668K1: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY INTERMEDIATE LAYER, corner_shape: SQUARE ALL CORNERS, overall_length: 1.4800 INCHES MINIMUM AND 1.5000 INCHES MAXIMUM IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, body_inside_diameter: 1.3740 INCHES MINIMUM AND 1.3750 INCHES MAXIMUM IN, body_outside_diameter: 1.5010 INCHES MINIMUM AND 1.5030 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-806-8356, 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
668K1
NSN: 3120-00-806-8356
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY INTERMEDIATE LAYER
corner_shapeSQUARE ALL CORNERS
overall_length1.4800 INCHES MINIMUM AND 1.5000 INCHES MAXIMUM IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter1.3740 INCHES MINIMUM AND 1.3750 INCHES MAXIMUM IN
body_outside_diameter1.5010 INCHES MINIMUM AND 1.5030 INCHES MAXIMUM IN
nondefinitive_spec/std_dataA1 COMPOSITION OR A2 COMPOSITION OR A3 COMPOSITION OR A4 COMPOSITION
lubricant_accommodation_styleGROOVED DOUBLE LOOP
NSN3120-00-806-8356
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 668K1 · 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
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY OUTSIDE DIAMETER: 1.5010 INCHES MINIMUM AND 1.5030 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
BODY INSIDE DIAMETER: 1.3740 INCHES MINIMUM AND 1.3750 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: A1 COMPOSITION OR A2 COMPOSITION OR A3 COMPOSITION OR A4 COMPOSITION
•
LUBRICANT ACCOMMODATION STYLE: GROOVED DOUBLE LOOP
•
MATERIAL: STEEL COMP 1015 OUTER LAYER
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER1.5010 INCHES MINIMUM AND 1.5030 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH1.4800 INCHES MINIMUM AND 1.5000 INCHES MAXIMUM IN
BODY INSIDE DIAMETER1.3740 INCHES MINIMUM AND 1.3750 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATAA1 COMPOSITION OR A2 COMPOSITION OR A3 COMPOSITION OR A4 COMPOSITION
LUBRICANT ACCOMMODATION STYLEGROOVED DOUBLE LOOP
MATERIALSTEEL COMP 1015 OUTER LAYER
MATERIALCOPPER ALLOY INTERMEDIATE LAYER
MATERIALOIL LUBRICATING LUBRICATION
SUBSTITUTES & CROSS-REFERENCES 7
409221Reference document
Same NSN cross-reference
Reference document — Secondary reference
74952Reference document
Same NSN cross-reference
Reference document — Secondary reference
068006Reference document
Same NSN cross-reference
Reference document — Secondary reference
3120008068356Reference document
Same NSN cross-reference
Reference document — Secondary reference
MILB13506Reference document
Same NSN cross-reference
Reference document — Identification reference
10WB0215Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 668K1?
668K1 is a BEARING,SLEEVE.
What parts can replace 668K1?
There are 7 known substitutes for 668K1: 409221, 74952, 068006 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 668K1?
668K1 is cataloged in the U.S. Government catalog under NSN 3120-00-806-8356. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.