PartsTable
Technical Data Sheet
PartsTable / COMPONENT / ASTMB439
ASTMB439 ✓ 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 BEARING,SLEEVE is a the manufacturer industrial component. Key specifications include material: OIL LUBRICATING LUBRICATION, corner_shape: SQUARE ALL CORNERS, overall_length: 0.3700 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES OVERALL, hardness_rating: 30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL, special_features: IMPREGNATED 18 PCT BY VOLUME WITH MIL-L-17331. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-662-8177, 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
ASTMB439
NSN: 3120-00-662-8177
FSC: 3120
CAGE: 81346 — AMERICAN SOCIETY FOR TESTING AND MATERIALS DBA ASTM INTERNATIONAL (USA)
SPECIFICATIONS
materialOIL LUBRICATING LUBRICATION
corner_shapeSQUARE ALL CORNERS
overall_length0.3700 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES OVERALL
hardness_rating30.0 ROCKWELL C MINIMUM AND 70.0 ROCKWELL C MAXIMUM OVERALL
special_featuresIMPREGNATED 18 PCT BY VOLUME WITH MIL-L-17331
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
body_inside_diameter0.2510 INCHES MINIMUM AND 0.2520 INCHES MAXIMUM IN
body_outside_diameter0.4395 INCHES MINIMUM AND 0.4405 INCHES MAXIMUM IN
material_document_and_classificationMIL-B-5687,TYPE 1,GRADE 2 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-B-5687,TYPE 1,GRADE 1 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
NSN3120-00-662-8177
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: ASTMB439 · 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
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND B COMPOSITION
•
MATERIAL: OIL LUBRICATING LUBRICATION
•
BODY OUTSIDE DIAMETER: 0.4385 INCHES MINIMUM AND 0.4395 INCHES MAXIMUM IN
•
BODY INSIDE DIAMETER: 0.3125 INCHES MINIMUM AND 0.3135 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-L-6085 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH0.3100 INCHES MINIMUM AND 0.3150 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND B COMPOSITION
MATERIALOIL LUBRICATING LUBRICATION
MATERIALSTEEL OVERALL
BODY OUTSIDE DIAMETER0.4385 INCHES MINIMUM AND 0.4395 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.3125 INCHES MINIMUM AND 0.3135 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-L-6085 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
CORNER SHAPESQUARE ALL CORNERS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
S4084Interchangeable
interchangeable cross-reference
interchangeable
0101FInterchangeable
interchangeable cross-reference
interchangeable
1FLEXIDUCTInterchangeable
interchangeable cross-reference
interchangeable
XB225-0250Interchangeable
interchangeable cross-reference
interchangeable
MILB5687TYPE2C0MP0SITI0NBInterchangeable
interchangeable cross-reference
interchangeable
XB237-0500Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy ASTMB439?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is ASTMB439?
ASTMB439 is a BEARING,SLEEVE.
What parts can replace ASTMB439?
There are 15 known substitutes for ASTMB439: S4084, 0101F, 1FLEXIDUCT and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ASTMB439?
ASTMB439 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-662-8177. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — ASTMB439

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026