sliding system roller
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It was used for sliding windows and run with anode-aluminum profile.
For bearing, with Chrome steel GCr15 material in outer and inner race, plastic covering mainly used with PA6 or POM, which were made by DuPont.
The holder was antirust treated or zinc-plating.
With the assembled set, it include the adjust-screw, holder, spring and deep gouge ball bearing.
Also, all of these materials were depend on the weight of per windows and we have the durability test, static load test, corrosion resistance.