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R55721 — BEARING,WASHER,THRUST

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

R55721: BEARING,WASHER,THRUST.

The BEARING,WASHER,THRUST is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1552 OVERALL, corner_shape: SQUARE ALL CORNERS, keyway_radius: 0.0300 INCHES MINIMUM AND 0.0500 INCHES MAXIMUM IN, major_diameter: 1.9010 INCHES MINIMUM AND 1.9050 INCHES MAXIMUM IN, minor_diameter: 1.7550 INCHES MINIMUM AND 1.7650 INCHES MAXIMUM IN, hardness_rating: 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 3120-01-258-0897, 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
R55721
NSN: 3120-01-258-0897
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 75160 — DEERE & CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1552 OVERALL
corner_shapeSQUARE ALL CORNERS
keyway_radius0.0300 INCHES MINIMUM AND 0.0500 INCHES MAXIMUM IN
major_diameter1.9010 INCHES MINIMUM AND 1.9050 INCHES MAXIMUM IN
minor_diameter1.7550 INCHES MINIMUM AND 1.7650 INCHES MAXIMUM IN
hardness_rating45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
keyway_quantity8
outside_diameter2.2800 INCHES NOMINAL IN
style_designatorROUND W/KEYWAYS
overall_thickness0.1630 INCHES MINIMUM AND 0.1670 INCHES MAXIMUM IN
surface_conditionGROUND
washer_keyway_depth0.0100 INCHES MINIMUM AND 0.0300 INCHES MAXIMUM IN
NSN3120-01-258-0897
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: R55721 · 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
•
KEYWAY RADIUS: 0.0300 INCHES MINIMUM AND 0.0500 INCHES MAXIMUM IN
•
OVERALL THICKNESS: 0.1630 INCHES MINIMUM AND 0.1670 INCHES MAXIMUM IN
•
HARDNESS RATING: 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: ROUND W/KEYWAYS
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE CONDITION: GROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
KEYWAY RADIUS0.0300 INCHES MINIMUM AND 0.0500 INCHES MAXIMUM IN
OVERALL THICKNESS0.1630 INCHES MINIMUM AND 0.1670 INCHES MAXIMUM IN
HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORROUND W/KEYWAYS
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE CONDITIONGROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OUTSIDE DIAMETER2.2800 INCHES NOMINAL IN
KEYWAY QUANTITY8
OTHER ITEMS IN FSC 3120 — Bearings, Plain, Unmounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3120-00-001-1288 3120-00-001-1835 3120-00-001-1838 3120-00-001-1928 3120-00-001-1934 3120-00-001-3933 3120-00-001-3937 3120-00-001-3938
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 R55721?
R55721 is a BEARING,WASHER,THRUST.
What is the NSN for R55721?
R55721 is cataloged in the U.S. Government catalog under NSN 3120-01-258-0897. 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.