Selecting the correct materials for a roller bearing is a key factor in the durability of our products. Extensive knowledge and experience is essential in regards to the tensile strength, corrosion resistance, hardness or brittleness of steels, metals, their alloys, ceramics and polymers, and composite materials. When producing roller bearings, not every material can be processed with equally good results. In addition, steel can reach very different levels of hardness after necessary heat treatment.
Typically, bearings made from chromium 100Cr6 (1.3505) and 100CrMo7-3 (1.3536) but also those of tempered steel 42CrMo4 (1.7225). Steel X46Cr13 (1.4034) and X105CrMo17 (1.4125) are frequently used in applications designed for corrosive environments. Hardenable stainless steel always contains a small amount of corrosion.
For special environmental circumstances there are bearings made from stainless steel, ceramics (normally made from silicon nitride) and hybrid bearings consisting of bearing rings made of steel and ceramic bearing balls (silicon nitride or zirconium oxide).
Plastic outer coatings are used for applications requiring reduced noise levels or limited roller to rail contact with lubricants. For this purpose plastics such as polyamides (PA6. 6; PA12) or POM (polyoxymethylene) high-performance plastics such as PEEK (polyetheretherketone) and PAI (polyamide) are used.