Thomson RoundRail shafting is manufactured to the highest quality standards in an ISO 9001:2015 registered facility to provide industry leading case hardness and depth, surface finish, roundness, straightness and cylindricity. Thomson offers the widest selection of bearing shafts in the industry to ensure optimal performance, minimal maintenance and long life.
For more than 70 years, Thomson has been producing precision linear shafting for its Linear Ball Bushing® Bearings and other applications.
While bearing shafts may appear the same to the untrained eye on the surface, there are significant performance differences due to the manufacturer’s selected standards and the manufacturing processes used to achieve them. Our most popular shafting, Thomson 60 Case®, was developed and is continually enhanced because of our goal to provide an optimal inner race surface for the high demands of linear bearings. To accomplish this, we focus on offering a consistent finish, roundness, straightness, cylindricity, case hardness and depth on all shafting. Unlike common bearing shafts, Thomson 60 Case LinearRace® shafts are manufactured to the highest quality standards in an ISO 9001:2015 registered facility. Our techniques have been continuously upgraded with proprietary knowledge gained from decades of manufacturing experience. Using Thomson 60 Case with Thomson Linear Ball Bushing Bearings ensures optimal bearing performance and travel life.
In order for Thomson bearing shafts to be used as linear guides, they must be properly mounted. Thomson offers a full selection of shaft supports to simplify this process.
When specifying linear guides for your applications, there are two types from which to choose: square (profile) guide rail and round guides (shafting). Your application will dictate which type of linear guide should be used.
Square guide rail is well suited to high-load applications that require good rigidity and high accuracy. These linear guides achieve their performance through the precise grinding of the ball tracks in the rail, which have close conformity to the balls. The classic application for profile rail bearings is in the machine tool industry, where load capacity, rigidity and accuracy are paramount. Round guides offer several advantages of their own, including the ability to run smoothly when mounted to less-than-perfect surfaces or used for vertical movements with heavy loads.
For a more detailed analysis of choosing square or round linear guides, click here.
Shafting is a key component in many linear motion machines and devices. Though shafting was designed for use with linear bearings, it is also useful for many other applications.
Thomson shafting is available in several tolerance ranges or classes: