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50-90500-21 — BUSHING,SLEEVE

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

50-90500-21: BUSHING,SLEEVE.

The BUSHING,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, corner_shape: SQUARE LEFT FLANGE OUTSIDE RIGHT CORNER, flange_width: 0.2500 INCHES NOMINAL IN, overall_length: 0.7000 INCHES NOMINAL IN, surface_finish: 63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY, style_designator: SOLID, EXTERNAL FLANGE ONE END. This part is cataloged in the U.S.

Government catalog under NSN 3120-01-101-0808, 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
50-90500-21
NSN: 3120-01-101-0808
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 23974 — CRESTVIEW AEROSPACE LLC DIV CRESTVIEW AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
corner_shapeSQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
flange_width0.2500 INCHES NOMINAL IN
overall_length0.7000 INCHES NOMINAL IN
surface_finish63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
style_designatorSOLID, EXTERNAL FLANGE ONE END
surface_treatmentCADMIUM OVERALL
body_inside_diameter0.6560 INCHES NOMINAL IN
body_outside_diameter0.8132 INCHES MINIMUM AND 0.8142 INCHES MAXIMUM IN
flange_outside_diameter1.0000 INCHES NOMINAL IN
material_document_and_classificationMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN3120-01-101-0808
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 50-90500-21 · 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
•
SURFACE FINISH: 63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
•
CORNER SHAPE: CHAMFERED INSIDE LEFT CORNER
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
CORNER SHAPECHAMFERED INSIDE LEFT CORNER
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
CORNER SHAPECHAMFERED INSIDE RIGHT CORNER
CORNER SHAPEUNDERCUT LEFT FLANGE BODY CORNER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
FLANGE OUTSIDE DIAMETER1.0000 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER0.8132 INCHES MINIMUM AND 0.8142 INCHES MAXIMUM IN
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 50-90500-21?
50-90500-21 is a BUSHING,SLEEVE.
What is the NSN for 50-90500-21?
50-90500-21 is cataloged in the U.S. Government catalog under NSN 3120-01-101-0808. 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.