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550-640 — BEARING,WASHER,THRUST

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

550-640: BEARING,WASHER,THRUST.

The BEARING,WASHER,THRUST is a the manufacturer industrial component. Key specifications include end_item_identification: REGULATOR ASSEMBLY, part_name_assigned_by_controlling_agency: SHAFT BEARING WASHER. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-725-6521, 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
550-640
NSN: 3120-00-725-6521
NIINs: 007256521, 017001384
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 02978 — RENK AMERICA LLC DIV RENK AMERICA (USA)
SPECIFICATIONS
end_item_identificationREGULATOR ASSEMBLY
part_name_assigned_by_controlling_agencySHAFT BEARING WASHER
NSN3120-00-725-6521
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 550-640 · 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
•
OVERALL THICKNESS: 0.0830 INCHES NOMINAL IN
•
HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: ROUND
•
DIAMETER: 0.7600 INCHES NOMINAL IN
•
SURFACE CONDITION: GROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OUTSIDE DIAMETER: 1.4400 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
OVERALL THICKNESS0.0830 INCHES NOMINAL IN
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORROUND
DIAMETER0.7600 INCHES NOMINAL IN
SURFACE CONDITIONGROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OUTSIDE DIAMETER1.4400 INCHES NOMINAL IN
FEATURES PROVIDEDCASEHARDENED
MATERIALSTEEL COMP 135M OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 550-640?
550-640 is a BEARING,WASHER,THRUST.
What is the NSN for 550-640?
550-640 is cataloged in the U.S. Government catalog under NSN 3120-00-725-6521. 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.