The BCHN19 is a nut-lock style stainless steel ball roller (ball transfer unit) featuring a SUS304 main body and a SUS440C main ball designed for upward-facing load movement. Model BCHN19 Brand ZH Material Chrome Steel precision P0 P6 P5 P4 Product Description BCHN19 (or the common prefix product code MISUMI C-BCHN19) is not a traditional rotary rolling bearing, but a stainless steel cutting type ball roller, belonging to the category of conveying and material handling