1. Product Overview The 40TAC90BSUC10PN7B single‑row super‑precision thrust angular contact ball bearing features 60‑degree large contact angle, SU free‑combination single unit, C10 standard preload and PN7B strict P4‑equivalent precision grade It delivers outstanding axial rigidity, mainly bears heavy unidirectional axial load together with partial radial load. Open‑type structure supports DB / DF duplex combination mounting, specially designed for CNC machine ball screw