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Technical Data Sheet
PartsTable / COMPONENT / 4B21S5-017
4B21S5-017 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The BUSHING,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OR STEEL COMP 4135 OVERALL, corner_shape: SQUARE ALL CORNERS, overall_length: 0.5262 INCHES MINIMUM AND 0.5312 INCHES MAXIMUM IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, surface_treatment: CHROMIUM OUTSIDE DIAMETER SURFACE OF BODY, body_inside_diameter: 0.3120 INCHES MINIMUM AND 0.3130 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-540-9574, 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
4B21S5-017
NSN: 3120-00-540-9574
FSC: 3120
CAGE: 43999 — THE BOEING COMPANY DIV LEGACY AM&M (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 4135 OVERALL
corner_shapeSQUARE ALL CORNERS
overall_length0.5262 INCHES MINIMUM AND 0.5312 INCHES MAXIMUM IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
surface_treatmentCHROMIUM OUTSIDE DIAMETER SURFACE OF BODY
body_inside_diameter0.3120 INCHES MINIMUM AND 0.3130 INCHES MAXIMUM IN
body_outside_diameter0.4355 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN
material_document_and_classificationMIL-T-6736,COND N MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6372 ASSN STD 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-C-320,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OUTSIDE DIAMETER SURFACE OF BODY
NSN3120-00-540-9574
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 4B21S5-017 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-T-6736,COND N MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6372 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL COMP 4130 OR STEEL COMP 4135 OVERALL
•
SURFACE TREATMENT: CHROMIUM OUTSIDE DIAMETER SURFACE OF BODY
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-C-320,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OUTSIDE DIAMETER SURFACE OF BODY
•
BODY INSIDE DIAMETER: 0.3120 INCHES MINIMUM AND 0.3130 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 0.4355 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
TECHNICAL CHARACTERISTICS (FLIS)
CORNER SHAPESQUARE ALL CORNERS
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-T-6736,COND N MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6372 ASSN STD 2ND MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 4130 OR STEEL COMP 4135 OVERALL
SURFACE TREATMENTCHROMIUM OUTSIDE DIAMETER SURFACE OF BODY
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-C-320,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OUTSIDE DIAMETER SURFACE OF BODY
BODY INSIDE DIAMETER0.3120 INCHES MINIMUM AND 0.3130 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.4355 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH0.5262 INCHES MINIMUM AND 0.5312 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
3740171Interchangeable
interchangeable cross-reference
interchangeable
21115Interchangeable
interchangeable cross-reference
interchangeable
2110-0005Interchangeable
interchangeable cross-reference
interchangeable
91391996Interchangeable
interchangeable cross-reference
interchangeable
31301.6Interchangeable
interchangeable cross-reference
interchangeable
21158-0372Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4B21S5-017?
4B21S5-017 is a BUSHING,SLEEVE.
What parts can replace 4B21S5-017?
There are 16 known substitutes for 4B21S5-017: 3740171, 21115, 2110-0005 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4B21S5-017?
4B21S5-017 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-540-9574. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026