rail bearing, linear motion bearings. Other code:CR43-2Z CR43R CR43Z CR43-RS CR43ZZ CR43.2RS CR43Z-SIE-S01 CRX43R CR43SS.2RS use to compact rail, for T rail, U rail, K rail.
Track rollers with spherical profile -CR43-2Z CR43R CR43Z CR43-RS CR43ZZ CR43.2RS CR43Z-SIE-S01 CRX43R CR43SS.2RS Track roller series CR43... are precision ball bearings that they are generally used in precision linear motion guide. They are supplied with rubber seals and metal shields respectively, and are also available with concentric pivots and eccentric pivots.
Material: Bearings: High quality chromium steel or martensitic stainless steel. e.g. 100Cr6 SUS440C Pivot: High quality carbon steel or stainless steel. e.g. 1045 SUS304