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The Timken ® Syber ® Bearing System Designer Tool now features Smart Selection, enabling users to find the right bearing faster by filtering options based on target life and key dimensions.

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Analyze Bearing Performance in an Application with Timken ® Syber ® Bearing System Designer

A powerful software tool that combines calculators and configurators to assist you with application design, bearing selection, installation, and troubleshooting. It’s free, easy-to-use, and accessible 24/7.

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  • QUICK FLEX Coupling Hub Photo
  • QF cutaway 1
  • QuickFlex-Dim
QUICK FLEX couplings consist of two hubs, one insert, and a cover.
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Bore Size  (in)

Coupling Size

Keyway Size  (in)

Part Number

Description 

Bore Size 

Coupling Size

Keyway Size (W x D)

Length thru Bore

CAD

N/A QF250X1-3/8 N/A 1-3/8 in N/A 250 N/A 5/16X5/32 in N/A 3.1 in78.7 mm N/A
N/A QF250X1-7/8 N/A 1-7/8 in N/A 250 N/A 1/2X1/4 in N/A 3.1 in78.7 mm N/A
N/A QF250S303X2-1/8 N/A 2-1/8 in N/A 250 N/A 1/2X1/4 in N/A 3.1 in78.7 mm N/A
N/A QF250X2-1/8 N/A 2-1/8 in N/A 250 N/A 1/2X1/4 in N/A 3.1 in78.7 mm N/A
N/A QF250X2-1/8U N/A 2-1/8 in N/A 250 N/A 1/2X1/4 in N/A 3.1 in78.7 mm N/A
N/A QF250S303X2-3/8 N/A 2-3/8 in N/A 250 N/A 5/8X5/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X2-3/8 N/A 2-3/8 in N/A 250 N/A 5/8X5/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X2-5/8 N/A 2-5/8 in N/A 250 N/A 5/8X5/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X2-5/8U N/A 2-5/8 in N/A 250 N/A 5/8X5/16 in N/A 3.1 in78.7 mm N/A
N/A QF250S303X2-7/8 N/A 2-7/8 in N/A 250 N/A 3/4X3/8 in N/A 3.1 in78.7 mm N/A
N/A QF250X2-7/8 N/A 2-7/8 in N/A 250 N/A 3/4X3/8 in N/A 3.1 in78.7 mm N/A
N/A QF250X2-7/8U N/A 2-7/8 in N/A 250 N/A 3/4X3/8 in N/A 3.1 in78.7 mm N/A
N/A QF250S303X3-1/8 N/A 3-1/8 in N/A 250 N/A 3/4X3/8 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-1/8 N/A 3-1/8 in N/A 250 N/A 3/4X3/8 in N/A 3.1 in78.7 mm N/A
N/A QF250S303X3-3/8 N/A 3-3/8 in N/A 250 N/A 7/8X7/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-3/8 N/A 3-3/8 in N/A 250 N/A 7/8X7/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-3/8E N/A 3-3/8 in N/A 250 N/A 1x1/2 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-3/8U N/A 3-3/8 in N/A 250 N/A 7/8X7/16 in N/A 3.1 in78.7 mm N/A
N/A QF250S303X3-5/8 N/A 3-5/8 in N/A 250 N/A 7/8X7/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-5/8 N/A 3-5/8 in N/A 250 N/A 7/8X7/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-5/8U N/A 3-5/8 in N/A 250 N/A 7/8X7/16 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-7/8 N/A 3-7/8 in N/A 250 N/A 1x1/2 in N/A 3.1 in78.7 mm N/A
N/A QF250X3-7/8U N/A 3-7/8 in N/A 250 N/A 1x1/2 in N/A 3.1 in78.7 mm N/A
N/A QF250X4-1/8 N/A 4-1/8 in N/A 250 N/A 1x1/2 in N/A 3.1 in78.7 mm N/A
N/A QF250X4-1/8U N/A 4-1/8 in N/A 250 N/A 1x1/2 in N/A 3.1 in78.7 mm N/A
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