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Technical Data Sheet
PartsTable / COMPONENT / ASTMB438/B438M
ASTMB438/B438M ✓ 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 ASTMB438/B438M is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-618-5637, 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
ASTMB438/B438M
NSN: 3120-00-618-5637
FSC: 3120
CAGE: 81346 — AMERICAN SOCIETY FOR TESTING AND MATERIALS DBA ASTM INTERNATIONAL (USA)
SPECIFICATIONS
Part NumberASTMB438/B438M
NSN3120-00-618-5637
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: ASTMB438/B438M · 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 INSIDE RIGHT CORNER
•
STYLE DESIGNATOR: SOLID, EXTERNAL FLANGE ONE END
•
MATERIAL: LUBRICANT LUBRICATION
TECHNICAL CHARACTERISTICS (FLIS)
CORNER SHAPESQUARE INSIDE RIGHT CORNER
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
CORNER SHAPESQUARE INSIDE LEFT CORNER
MATERIALLUBRICANT LUBRICATION
CORNER SHAPESQUARE LEFT FLANGE BODY CORNER
MATERIALCOPPER ALLOY OVERALL
CORNER SHAPESQUARE OUTSIDE RIGHT CORNER
FLANGE OUTSIDE DIAMETER1.0605 INCHES MINIMUM AND 1.0655 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
FF703-1Interchangeable
interchangeable cross-reference
interchangeable
27J661-28Interchangeable
interchangeable cross-reference
interchangeable
F1207-2Interchangeable
interchangeable cross-reference
interchangeable
64913Interchangeable
interchangeable cross-reference
interchangeable
T2001Interchangeable
interchangeable cross-reference
interchangeable
TT2001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ASTMB438/B438M?
ASTMB438/B438M is a ASTMB438/B438M.
What parts can replace ASTMB438/B438M?
There are 13 known substitutes for ASTMB438/B438M: FF703-1, 27J661-28, F1207-2 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ASTMB438/B438M?
ASTMB438/B438M is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-618-5637. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026