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340891 — POLARIZING KEY,ELECTRICAL CONNEC

✓ Government record, cited
Legrand · MRO · MRO_GENERAL
PRODUCT OVERVIEW

340891: POLARIZING KEY,ELECTRICAL CONNEC.

POLARIZING KEY,ELECTRICAL CONNEC. Key specifications include material: PLASTIC, inscription: RETURN, overall_width: 0.750 INCHES NOMINAL IN, overall_height: 0.500 INCHES NOMINAL IN, overall_length: 1.094 INCHES NOMINAL IN, end_item_identification: TRACTOR FEED RD SET. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-249-0691, 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
MRO→ MRO_GENERAL→ 340891
NSN: 3120-00-249-0691
NIINs: 002490691, 010278542, 014107821
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 62983 — EATON AEROSPACE, LLC DBA JACKSON SOUTH (USA)
SPECIFICATIONS
materialPLASTIC
inscriptionRETURN
overall_width0.750 INCHES NOMINAL IN
overall_height0.500 INCHES NOMINAL IN
overall_length1.094 INCHES NOMINAL IN
end_item_identificationTRACTOR FEED RD SET
NSN3120-00-249-0691
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 340891 · Legrand ⚠ 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
•
SURFACE FINISH: 125.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY OUTSIDE DIAMETER: 0.4368 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
•
HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
BODY INSIDE DIAMETER: 0.2700 INCHES MINIMUM AND 0.2720 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH125.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY
SURFACE FINISH10.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY
CORNER SHAPESQUARE ALL CORNERS
BODY OUTSIDE DIAMETER0.4368 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
HARDNESS RATING38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH1.4710 INCHES MINIMUM AND 1.4910 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.2700 INCHES MINIMUM AND 0.2720 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 340891?
340891 is a POLARIZING KEY,ELECTRICAL CONNEC manufactured by Legrand. It is classified as a MRO (MRO_GENERAL).
What is the NSN for 340891?
340891 is cataloged in the U.S. Government catalog under NSN 3120-00-249-0691. 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.