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ST4M218M30 — BEARING,PLAIN,SELF-ALIGNING

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

ST4M218M30: BEARING,PLAIN,SELF-ALIGNING.

The BEARING,PLAIN,SELF-ALIGNING is a the manufacturer industrial component. Key specifications include bore_diameter: 1.9020 INCHES MINIMUM AND 1.9025 INCHES MAXIMUM IN, inner_member_width: 1.1700 INCHES MINIMUM AND 1.1750 INCHES MAXIMUM IN, outer_member_width: 1.1200 INCHES MINIMUM AND 1.1300 INCHES MAXIMUM IN, outer_member_outside_diameter: 2.6540 INCHES MINIMUM AND 2.6550 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-01-133-7939, 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
ST4M218M30
NSN: 3120-01-133-7939
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
bore_diameter1.9020 INCHES MINIMUM AND 1.9025 INCHES MAXIMUM IN
inner_member_width1.1700 INCHES MINIMUM AND 1.1750 INCHES MAXIMUM IN
outer_member_width1.1200 INCHES MINIMUM AND 1.1300 INCHES MAXIMUM IN
outer_member_outside_diameter2.6540 INCHES MINIMUM AND 2.6550 INCHES MAXIMUM IN
NSN3120-01-133-7939
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: ST4M218M30 · 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
•
INNER MEMBER WIDTH: 1.1700 INCHES MINIMUM AND 1.1750 INCHES MAXIMUM IN
•
OUTER MEMBER WIDTH: 1.1200 INCHES MINIMUM AND 1.1300 INCHES MAXIMUM IN
•
BORE DIAMETER: 1.9020 INCHES MINIMUM AND 1.9025 INCHES MAXIMUM IN
•
OUTER MEMBER OUTSIDE DIAMETER: 2.6540 INCHES MINIMUM AND 2.6550 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INNER MEMBER WIDTH1.1700 INCHES MINIMUM AND 1.1750 INCHES MAXIMUM IN
OUTER MEMBER WIDTH1.1200 INCHES MINIMUM AND 1.1300 INCHES MAXIMUM IN
BORE DIAMETER1.9020 INCHES MINIMUM AND 1.9025 INCHES MAXIMUM IN
OUTER MEMBER OUTSIDE DIAMETER2.6540 INCHES MINIMUM AND 2.6550 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 8
YTA390AReference document
Same NSN cross-reference
Reference document — Secondary reference
KSAD30-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
KSAD30-13Reference document
Same NSN cross-reference
Reference document — Secondary reference
ST4M218Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
10108049Reference document
Same NSN cross-reference
Reference document — Informative reference only
ADSB30-303Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST4M218M30?
ST4M218M30 is a BEARING,PLAIN,SELF-ALIGNING.
What parts can replace ST4M218M30?
There are 8 known substitutes for ST4M218M30: YTA390A, KSAD30-8, KSAD30-13 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST4M218M30?
ST4M218M30 is cataloged in the U.S. Government catalog under NSN 3120-01-133-7939. 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.