[Application Features] FZH copper-ball cage, is a copper alloy as a matrix, and on its outer surface, processed orderly, proper size, shape special cavities, in its cavities insert Rolling Ball . Opening circumferential groove using the latest technology lock ball effectively solve the traditional point-locking ball lock ball and indentation can not completely prevent the ball off problems. Hole bottom machined spigot 90 ° free rotation so that copper ball in the hole without falling off. Due to a diameter greater than the wall thickness of the ball retainers, so when using the ball up to keep the circle, the outer surface in direct contact with the mating holes and shafts, the matrix (retainer) floating in the middle, and matching the difference is less than the radius of the hole and shaft diameter steel balls, namely balls and match for the interference fit, with high accuracy, flexible shaft and bore relative motion. A retaining ring replacements. 1. Bushing: material GCrl5, YB9, heat treatment, hardness HRC62 ~ 66, according to technical conditions GB / T12446 and the shaft with 0.01 to 0.02 should have radial interference, surface roughness of 2 axes: material GCrl5, YB9, heat treatment, hardness HRC62 ~ 66, the technical conditions according to GB / T12446, tolerance of the shaft using h5, surface roughness 3. Measure: Use common measurements (pneumatic measuring instrument, dry-foot outer diameter, the inner diameter of dial gauge, etc.) Size deviation measurement axis bushings and ball, you can find the amount of interference after that Ymax = dmax + 2d'-Dmin, it requires interference of 0.01 ~ 0.02mm.