21309K

Tier-one manufacturer — brand supplied may vary ✓ Bore checked against the ISO table
$66.95 USD
$66.95 USD
Sale Sold out
Bore45 mm 1.7717 in
Outside dia.100 mm 3.937 in
Width25 mm 0.9843 in
TypeSpherical roller bearing
SealingOpen
ClearanceNormal
Ships separately from our European warehouse — shipping from $79, quoted at checkout
Ships from our European partner stock — allow 5–8 business days
  • 21309K — illustration
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Image is for illustration purposes only.

What 21309K means

CodePositionMeaning
2 Type Spherical roller bearing
1 Width series Width series 1
3 Diameter series Diameter series 3 (medium)
09 Bore Bore code 09 × 5 = 45 mm
K Bore type Tapered bore, taper 1:12 (mounts on an adapter or withdrawal sleeve)

Read from the ISO / ABMA numbering rules and the makers' published suffix conventions. Decode any other number with the bearing number decoder.

21309K specifications

Specification Metric Inch Basis
Bore (d) 45 mm 1.7717 in ISO table for this designation, confirmed by supplier data
Outside diameter (D) 100 mm 3.937 in Supplier catalogue listing
Width (B) 25 mm 0.9843 in Supplier catalogue listing
Bearing type Spherical roller bearing Stated by the designation
Seals / shields Open (no seals or shields) Stated by the designation
Internal clearance Normal (CN): no clearance code in the designation Stated by the designation
Bore Tapered bore (1:12) Stated by the designation
Tolerance class Normal (ISO P0 / ABEC 1): no tolerance-class code Stated by the designation

21309K is a spherical roller bearing, 45 mm bore × 100 mm OD × 25 mm wide (1.7717 × 3.937 × 0.9843 in). It has a tapered bore (1:12).

The 21309K is a spherical roller bearing from the 213 series with a 45 mm tapered bore (1:12 taper ratio). Spherical roller bearings feature barrel-shaped rollers running on a spherical outer ring raceway, providing self-aligning capability to accommodate shaft misalignment and deflection.

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