Extended Inner Ring Bearing

Extended Inner Ring Bearing

A deep groove ball bearing with a purposefully extended inner ring that serves as an integrated shaft sleeve — eliminating the need for a separate press-fitted sleeve and enabling direct, precise shaft coupling with options for threaded holes, keyways, gears, and splines.

• Base Type: Deep groove ball bearing with extended inner ring
• Secondary Machining: Threaded holes, keyways, gears, splines available
• Tolerance Stack: Eliminated — single-piece machining
• Concentricity: Guaranteed by integrated processing
• Customization: Extension length, bore diameter, and machining features per drawing

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Eliminate Tolerance Stack-Up

In the Extended Inner Ring Bearing, the inner ring and shaft-coupling features are machined as one piece. There is no separate sleeve to introduce additional dimensional variation. Concentricity, bore accuracy, and feature positioning are all controlled in a single machining setup — ensuring consistent, predictable performance across every unit in every batch.

In conventional assemblies, the shaft sleeve and bearing inner ring each have their own dimensional tolerances. When press-fitted together, these tolerances stack up: the sleeve’s OD variation combines with the bearing’s ID variation, making total system accuracy unpredictable. Achieving consistency requires tightening tolerances on both parts, which significantly increases machining cost.

No Press-Fit Deformation

Since no sleeve is pressed into the inner ring, the bearing’s internal geometry remains exactly as designed. Rolling element clearance, contact conditions, and load distribution are unaffected by assembly forces — resulting in stable noise levels, consistent operating temperature, and reliable concentricity from unit to unit.

Press-fitting a shaft sleeve into a standard bearing slightly expands the inner ring, reducing internal clearance and altering the contact between rolling elements and raceways. This changes the bearing’s noise signature, increases heat generation, and makes batch-to-batch performance difficult to control.

Compact, Lightweight Assembly

The extended inner ring replaces a separate shaft sleeve, eliminating an entire layer of material. The resulting assembly is shorter in the axial direction and lighter in weight — a meaningful advantage in equipment where space and mass directly affect performance, such as textile machinery and automated production lines.

A traditional bearing-plus-sleeve assembly adds radial thickness and axial length without contributing to load capacity or precision. In space-constrained applications, this extra bulk may force compromises in other aspects of the machine design.