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D4377 — BEARING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

D4377: BEARING,SLEEVE.

The BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, head_height: 0.094 INCHES NOMINAL IN, corner_shape: SQUARE OUTSIDE RIGHT CORNER, flange_width: 0.4690 INCHES MINIMUM AND 0.5310 INCHES MAXIMUM IN, overall_height: 0.359 INCHES NOMINAL IN, overall_length: 2.2813 INCHES MINIMUM AND 2.3437 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-424-0613, 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
D4377
NSN: 3120-00-424-0613
NIINs: 004240613, 012091138
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 35311 — AMERICAN STANDARD INC WESTINGHOUSE AIR BRAKE CO DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
head_height0.094 INCHES NOMINAL IN
corner_shapeSQUARE OUTSIDE RIGHT CORNER
flange_width0.4690 INCHES MINIMUM AND 0.5310 INCHES MAXIMUM IN
overall_height0.359 INCHES NOMINAL IN
overall_length2.2813 INCHES MINIMUM AND 2.3437 INCHES MAXIMUM IN
hardness_rating55.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSTANDARD
features_providedCASEHARDENED
body_inside_diameter2.7470 INCHES MINIMUM AND 2.7570 INCHES MAXIMUM IN
body_outside_diameter4.1260 INCHES MINIMUM AND 4.1280 INCHES MAXIMUM IN
head_outside_diameter1.344 INCHES NOMINAL IN
NSN3120-00-424-0613
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: D4377 · 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: CHAMFERED INSIDE LEFT CORNER
•
FLANGE OUTSIDE DIAMETER: 4.2400 INCHES MINIMUM AND 4.2600 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 4.1260 INCHES MINIMUM AND 4.1280 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CORNER SHAPECHAMFERED INSIDE LEFT CORNER
CORNER SHAPESQUARE INSIDE RIGHT CORNER
CORNER SHAPERELIEF GROOVE LEFT FLANGE BODY CORNER
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
FLANGE OUTSIDE DIAMETER4.2400 INCHES MINIMUM AND 4.2600 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER4.1260 INCHES MINIMUM AND 4.1280 INCHES MAXIMUM IN
HARDNESS RATING55.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is D4377?
D4377 is a BEARING,SLEEVE.
What is the NSN for D4377?
D4377 is cataloged in the U.S. Government catalog under NSN 3120-00-424-0613. 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.