PartsTable
Technical Data Sheet
Download PDF

213491 — TRANSFORMER,POWER AUTOTRANSFORME

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

213491: TRANSFORMER,POWER AUTOTRANSFORME.

TRANSFORMER,POWER AUTOTRANSFORME. Key specifications include height: 2.250 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING AND ALUMINUM ALLOY WASHER, body_length: 2.250 INCHES MAXIMUM IN, corner_shape: SQUARE ALL CORNERS, hole_diameter: 0.3125 INCHES NOMINAL FIRST IN, bushing_length: 1.870 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-354-6401, 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
213491
NSN: 3120-00-354-6401
NIINs: 003546401, 009259090, 009384067
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 35301 — DRESSER INDUSTRIES INC LEROI DIV (USA)
SPECIFICATIONS
height2.250 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING AND ALUMINUM ALLOY WASHER
body_length2.250 INCHES MAXIMUM IN
corner_shapeSQUARE ALL CORNERS
hole_diameter0.3125 INCHES NOMINAL FIRST IN
bushing_length1.870 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
overall_length3.1720 INCHES MINIMUM AND 3.1730 INCHES MAXIMUM IN
inside_diameter0.250 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
mounting_methodTERMINAL SINGLE GROUP
frequency_rating400.0 HERTZ NOMINAL SINGLE COMPONENT
special_featuresDOCUMENTATION REVEALS OUTPUT TAP VOLTAGE RATIO FROM M3.9 PCT TO P83.0 PCT
NSN3120-00-354-6401
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 213491 · 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
•
BODY OUTSIDE DIAMETER: 3.1720 INCHES MINIMUM AND 3.1730 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 15 ASSN STD SINGLE MATERIAL RESPONSE INNER LAYER
•
BODY INSIDE DIAMETER: 3.0015 INCHES MINIMUM AND 3.0025 INCHES MAXIMUM IN
•
LUBRICANT ACCOMMODATION STYLE: GROOVED CLOSED BOTH ENDS AND GROOVED CIRCULAR
•
ANTIROTATION/LUBRICATION TYPE AND QUANTITY: 2 HOLE
TECHNICAL CHARACTERISTICS
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER3.1720 INCHES MINIMUM AND 3.1730 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 15 ASSN STD SINGLE MATERIAL RESPONSE INNER LAYER
OVERALL LENGTH3.1720 INCHES MINIMUM AND 3.1730 INCHES MAXIMUM IN
BODY INSIDE DIAMETER3.0015 INCHES MINIMUM AND 3.0025 INCHES MAXIMUM IN
LUBRICANT ACCOMMODATION STYLEGROOVED CLOSED BOTH ENDS AND GROOVED CIRCULAR
ANTIROTATION/LUBRICATION TYPE AND QUANTITY2 HOLE
MATERIALLEAD ALLOY INNER LAYER
MATERIALSTEEL OUTER LAYER
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy 213491?
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 213491?
213491 is a TRANSFORMER,POWER AUTOTRANSFORME.
What is the NSN for 213491?
213491 is cataloged in the U.S. Government catalog under NSN 3120-00-354-6401. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 213491

✓ 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.