Newly Re-designed P-Series Gearbox improves Backlash, Corrosion Resistance and Center Distance between Input and Outputs! 

Brass & Aluminum Bore Reducers

Ondrives.US designs and manufactures the highest quality, best-performing bore reducer sleeves on the market today. Our brass bore reducers and aluminum bore reducers are simple adapters made to slip into the bore hole of a rotating component to reduce the bore diameter to a smaller size. A broad range of inch and metric sizes are available. Order brass or aluminum shaft coupling adapters for your application, request a quote, or contact Ondrives.US for more information.


High-Performance Bore Reducers for All Applications

The unique design of our aluminum bore adapters and brass bore reducers features a feathered head that sits in the chamfer at the bore entry and prevents over-insertion for foolproof installation. When fitted to set screw hubs, these units prevent screws from scoring the shaft and enable repeated repositioning and fast, easy removal.

Shaft couplings with identical bore diameters at both ends can be quickly and cost-effectively converted to combination bore couplings using Ondrives.US brass or aluminum bore adapters.

Custom Brass and Aluminum Bore Reducers Manufactured to Your Exact Specifications

At Ondrives.US, we can assist with designs, modifications, prototypes, and complete production of custom drive components and gears for any application. If your project specifications require custom mechanical components, our engineering team can produce parts and components that match your drawings and meet your performance needs.

The Ondrives.US Advantage

  • Available in numerous standard diameters to fit couplings, gears, pulleys, etc.
  • Bore diameters from 2mm to 25mm and 0.120” to 1”
  • Manufactured from top quality brass or aluminum materials
  • Converts set screw fasteners into split clamp devices
  • Will not mark or damage soft shafts
  • Exceptional holding power
  • Simple and inexpensive solution to adjust a bore size
Ondrives.US quality surpasses the competition! Order brass bore adapters or aluminum bore adapters today, request a quote, or contact us for more information.