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ST491A — BEARING UNIT,PLAIN

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

ST491A: BEARING UNIT,PLAIN.

The BEARING UNIT,PLAIN is a the manufacturer industrial component. Key specifications include end_item_identification: 3895-01-609-4511, part_name_assigned_by_controlling_agency: BEARING ASSEMBLY. This part is cataloged in the U.S.

Government catalog under NSN 3130-01-660-9115, 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
ST491A
NSN: 3130-01-660-9115
FSC: 3130 — Bearings, Mounted
CAGE: 63092 — PEER BEARING CO (USA)
SPECIFICATIONS
end_item_identification3895-01-609-4511
part_name_assigned_by_controlling_agencyBEARING ASSEMBLY
NSN3130-01-660-9115
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: ST491A · 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
TECHNICAL CHARACTERISTICS
PART NAME ASSIGNED BY CONTROLLING AGENCYBEARING ASSEMBLY
END ITEM IDENTIFICATION3895-01-609-4511
OTHER ITEMS IN FSC 3130 — Bearings, Mounted
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3130-00-001-5118 3130-00-001-5137 3130-00-001-6585 3130-00-003-0422 3130-00-003-0455 3130-00-003-0794 3130-00-003-2802 3130-00-003-9535
SUBSTITUTES & CROSS-REFERENCES 1
5150-628Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST491A?
ST491A is a BEARING UNIT,PLAIN.
What parts can replace ST491A?
There is 1 known substitute for ST491A: 5150-628. Substitute compatibility should be verified for your specific system.
What is the NSN for ST491A?
ST491A is cataloged in the U.S. Government catalog under NSN 3130-01-660-9115. 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.